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Joseph Weston authored on26/03/2021 06:10:10
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 .PHONY: build upload
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+publications:
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+	scripts/fetch-publications.py > data/publications.yml
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 build:
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 	hugo
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   }
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 }
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+/* Publications */
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+
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+.publication-list {
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+  list-style: outside none none ;
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+  padding-left: 0 ;
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+}
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+ul.pub-authors {
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+    li {
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+      display: inline ;
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+      font-size: 1.8rem;
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+    }
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+    li.pub-coauthor {
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+      color: #888 ;
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+    }
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+}
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+.publication {
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+  padding-top: 1rem;
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+  border-top: 3px solid #BBB ;
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+.pub-title {
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+  //font-size: 1.8rem ;
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+  margin-bottom: 1rem ;
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+.pub-info {
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+  font-size: 1.8rem;
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+  float: left ;
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+  margin-right: 0.5em ;
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+  //font-weight: bold ;
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+.pub-abstract {
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+.pub-arxiv a {
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 #   name = "Blog"
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 #   url  = "posts"
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-# [[menu.main]]
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-#   name = "Publications"
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-#   weight = 1
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-#   url  = "publications"
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+[[menu.main]]
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+  name = "Publications"
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+  url  = "publications"
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+---
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+title: Publications
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+---
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+
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+Below is a selection of scientific articles of which I have (joint) authorship.
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+The projects that led to these publications were within the context of
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+my PhD.
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+
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+{{< publication_list >}}
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+- title: 'Tkwant: a software package for time-dependent quantum transport'
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+  authors:
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+  - Thomas Kloss
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+  - Joseph Weston
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+  - Benoit Gaury
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+  - Benoit Rossignol
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+  - Christoph Groth
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+  - Xavier Waintal
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+  abstract: "Tkwant is a Python package for the simulation of quantum nanoelectronics\n\
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+    devices to which external time-dependent perturbations are applied. Tkwant is\n\
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+    an extension of the Kwant package (https://kwant-project.org/) and can handle\n\
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+    the same types of systems: discrete tight-binding-like models that consist of\n\
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+    an arbitrary central region connected to semi-infinite electrodes. The problem\n\
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+    is genuinely many-body even in the absence of interactions and is treated\nwithin\
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+    \ the non-equilibrium Keldysh formalism. Examples of Tkwant applications\ninclude\
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+    \ the propagation of plasmons generated by voltage pulses, propagation of\nexcitations\
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+    \ in the quantum Hall regime, spectroscopy of Majorana fermions in\nsemiconducting\
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+    \ nanowires, current-induced skyrmion motion in spintronic\ndevices, multiple\
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+    \ Andreev reflection, Floquet topological insulators,\nthermoelectric effects,\
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+    \ and more. The code has been designed to be easy to use\nand modular. Tkwant\
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+    \ is free software distributed under a BSD license and can be\nfound at https://tkwant.kwant-project.org/."
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+  date: '2021-02-22T12:24:08Z'
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+  link: http://arxiv.org/abs/2009.03132v3
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+  ref: 2009.03132v3
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+  jref: New J. Phys. 23, 023025 (2021)
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+  jlink: http://dx.doi.org/10.1088/1367-2630/abddf7
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+- title: "The HANDE-QMC project: open-source stochastic quantum chemistry from the\n\
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+    \  ground state up"
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+  authors:
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+  - James S. Spencer
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+  - Nick S. Blunt
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+  - Seonghoon Choi
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+  - Jiri Etrych
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+  - Maria-Andreea Filip
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+  - W. M. C. Foulkes
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+  - Ruth S. T. Franklin
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+  - Will J. Handley
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+  - Fionn D. Malone
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+  - Verena A. Neufeld
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+  - Roberto Di Remigio
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+  - Thomas W. Rogers
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+  - Charles J. C. Scott
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+  - James J. Shepherd
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+  - William A. Vigor
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+  - Joseph Weston
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+  - RuQing Xu
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+  - Alex J. W. Thom
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+  abstract: "Building on the success of Quantum Monte Carlo techniques such as diffusion\n\
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+    Monte Carlo, alternative stochastic approaches to solve electronic structure\n\
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+    problems have emerged over the last decade. The full configuration interaction\n\
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+    quantum Monte Carlo (FCIQMC) method allows one to systematically approach the\n\
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+    exact solution of such problems, for cases where very high accuracy is desired.\n\
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+    The introduction of FCIQMC has subsequently led to the development of coupled\n\
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+    cluster Monte Carlo (CCMC) and density matrix quantum Monte Carlo (DMQMC),\nallowing\
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+    \ stochastic sampling of the coupled cluster wave function and the exact\nthermal\
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+    \ density matrix, respectively. In this article we describe the HANDE-QMC\ncode,\
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+    \ an open-source implementation of FCIQMC, CCMC and DMQMC, including\ninitiator\
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+    \ and semi-stochastic adaptations. We describe our code and demonstrate\nits use\
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+    \ on three example systems; a molecule (nitric oxide), a model solid (the\nuniform\
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+    \ electron gas), and a real solid (diamond). An illustrative tutorial is\nalso\
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+    \ included."
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+  date: '2018-12-04T19:27:19Z'
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+  link: http://arxiv.org/abs/1811.11679v2
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+  ref: 1811.11679v2
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+- title: Transient and Sharvin resistances of Luttinger liquids
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+  authors:
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+  - Thomas Kloss
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+  - Joseph Weston
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+  - Xavier Waintal
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+  abstract: "Although the intrinsic conductance of an interacting one-dimensional\
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+    \ system\nis renormalized by the electron-electron correlations, it has been known\
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+    \ for\nsome time that this renormalization is washed out by the presence of the\n\
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+    (non-interacting) electrodes to which the wire is connected. Here, we study the\n\
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+    transient conductance of such a wire: a finite voltage bias is suddenly applied\n\
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+    across the wire and we measure the current before it has enough time to reach\n\
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+    its stationary value. These calculations allow us to extract the Sharvin\n(contact)\
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+    \ resistance of Luttinger and Fermi liquids. In particular, we find\nthat a perfect\
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+    \ junction between a Fermi liquid electrode and a Luttinger liquid\nelectrode\
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+    \ is characterized by a contact resistance that consists of half the\nquantum\
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+    \ of conductance in series with half the intrinsic resistance of an\ninfinite\
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+    \ Luttinger liquid. These results were obtained using two different\nmethods:\
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+    \ a dynamical Hartree-Fock approach and a self-consistent Boltzmann\napproach.\
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+    \ Although these methods are formally approximate we find a perfect\nmatch with\
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+    \ the exact results of Luttinger/Fermi liquid theory."
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+  date: '2018-04-26T08:00:21Z'
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+  link: http://arxiv.org/abs/1710.00895v2
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+  ref: 1710.00895v2
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+  jref: Phys. Rev. B 97, 165134 (2018)
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+  jlink: http://dx.doi.org/10.1103/PhysRevB.97.165134
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+- title: Cooperative Charge Pumping and Enhanced Skyrmion Mobility
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+  authors:
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+  - Adel Abbout
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+  - Joseph Weston
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+  - Xavier Waintal
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+  - Aurelien Manchon
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+  abstract: "The electronic pumping arising from the steady motion of ferromagnetic\n\
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+    skyrmions is investigated by solving the time evolution of the Schrodinger\nequation\
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+    \ implemented on a tight-binding model with the statistical physics of\nthe many-body\
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+    \ problem. It is shown that the ability of steadily moving\nskyrmions to pump\
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+    \ large charge currents arises from their non-trivial magnetic\ntopology, i.e.\
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+    \ the coexistence between spin-motive force and topological Hall\neffect. Based\
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+    \ on an adiabatic scattering theory, we compute the pumped current\nand demonstrate\
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+    \ that it scales with the reflection coefficient of the\nconduction electrons\
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+    \ against the skyrmion. Finally, we propose that such a\nphenomenon can be exploited\
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+    \ in the context of racetrack devices, where the\nelectronic pumping enhances\
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+    \ the collective motion of the train of skyrmions."
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+  date: '2018-04-06T21:14:34Z'
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+  link: http://arxiv.org/abs/1804.02460v1
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+  ref: 1804.02460v1
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+  jref: Phys. Rev. Lett. 121, 257203 (2018)
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+  jlink: http://dx.doi.org/10.1103/PhysRevLett.121.257203
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+- title: Towards Realistic Time-Resolved Simulations of Quantum Devices
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+  authors:
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+  - Joseph Weston
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+  - Xavier Waintal
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+  abstract: "We report on our recent efforts to perform realistic simulations of large\n\
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+    quantum devices in the time domain. In contrast to d.c. transport where the\n\
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+    calculations are explicitly performed at the Fermi level, the presence of\ntime-dependent\
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+    \ terms in the Hamiltonian makes the system inelastic so that it\nis necessary\
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+    \ to explicitly enforce the Pauli principle in the simulations. We\nillustrate\
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+    \ our approach with calculations for a flying qubit interferometer, a\nnanoelectronic\
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+    \ device that is currently under experimental investigation. Our\ncalculations\
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+    \ illustrate the fact that many degrees of freedom (16,700\ntight-binding sites\
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+    \ in the scattering region) and long simulation times (80,000\ntimes the inverse\
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+    \ Bandwidth of the tight-binding model) can be easily achieved\non a local computer."
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+  date: '2016-04-05T09:39:35Z'
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+  link: http://arxiv.org/abs/1604.01198v1
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+  ref: 1604.01198v1
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+  jref: J Comput Electron 15, 1148 (2016)
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+  jlink: http://dx.doi.org/10.1007/s10825-016-0855-9
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+- title: "A linear-scaling source-sink algorithm for simulating time-resolved\n  quantum\
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+    \ transport and superconductivity"
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+  authors:
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+  - Joseph Weston
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+  - Xavier Waintal
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+  abstract: "We report on a \"source-sink\" algorithm which allows one to calculate\n\
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+    time-resolved physical quantities from a general nanoelectronic quantum system\n\
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+    (described by an arbitrary time-dependent quadratic Hamiltonian) connected to\n\
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+    infinite electrodes. Although mathematically equivalent to the non equilibrium\n\
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+    Green's function formalism, the approach is based on the scattering wave\nfunctions\
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+    \ of the system. It amounts to solving a set of generalized\nSchr\\\"odinger equations\
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+    \ which include an additional \"source\" term (coming from\nthe time dependent\
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+    \ perturbation) and an absorbing \"sink\" term (the electrodes).\nThe algorithm\
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+    \ execution time scales linearly with both system size and\nsimulation time allowing\
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+    \ one to simulate large systems (currently around $10^6$\ndegrees of freedom)\
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+    \ and/or large times (currently around $10^5$ times the\nsmallest time scale of\
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+    \ the system). As an application we calculate the\ncurrent-voltage characteristics\
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+    \ of a Josephson junction for both short and long\njunctions, and recover the\
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+    \ multiple Andreev reflexion (MAR) physics. We also\ndiscuss two intrinsically\
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+    \ time-dependent situations: the relaxation time of a\nJosephson junction after\
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+    \ a quench of the voltage bias, and the propagation of\nvoltage pulses through\
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+    \ a Josephson junction. In the case of a ballistic, long\nJosephson junction,\
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+    \ we predict that a fast voltage pulse creates an oscillatory\ncurrent whose frequency\
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+    \ is controlled by the Thouless energy of the normal\npart. A similar effect is\
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+    \ found for short junctions, a voltage pulse produces\nan oscillating current\
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+    \ which, in the absence of electromagnetic environment,\ndoes not relax."
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+  date: '2015-10-20T17:05:29Z'
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+  link: http://arxiv.org/abs/1510.05967v1
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+  ref: 1510.05967v1
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+  jref: Phys. Rev. B 93, 134506 (2016)
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+  jlink: http://dx.doi.org/10.1103/PhysRevB.93.134506
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+- title: Probing (topological) Floquet states through DC transport
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+  authors:
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+  - Michel Fruchart
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+  - Pierre Delplace
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+  - Joseph Weston
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+  - Xavier Waintal
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+  - David Carpentier
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+  abstract: "We consider the differential conductance of a periodically driven system\n\
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+    connected to infinite electrodes. We focus on the situation where the\ndissipation\
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+    \ occurs predominantly in these electrodes. Using analytical\narguments and a\
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+    \ detailed numerical study we relate the differential\nconductances of such a\
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+    \ system in two and three terminal geometries to the\nspectrum of quasi-energies\
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+    \ of the Floquet operator. Moreover these differential\nconductances are found\
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+    \ to provide an accurate probe of the existence of gaps in\nthis quasi-energy\
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+    \ spectrum, being quantized when topological edge states occur\nwithin these gaps.\
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+    \ Our analysis opens the perspective to describe the\nintermediate time dynamics\
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+    \ of driven mesoscopic conductors as topological\nFloquet filters."
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+  date: '2015-10-06T13:09:09Z'
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+  link: http://arxiv.org/abs/1507.00152v2
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+  ref: 1507.00152v2
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+  jref: Physica E 75 (2016) 287-294
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+  jlink: http://dx.doi.org/10.1016/j.physe.2015.09.035
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+- title: Manipulating Andreev and Majorana Bound States with microwaves
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+  authors:
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+  - Joseph Weston
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+  - Benoit Gaury
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+  - Xavier Waintal
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+  abstract: "We study the interplay between Andreev (Majorana) bound states that form\
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+    \ at\nthe boundary of a (topological) superconductor and a train of microwave\
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+    \ pulses.\nWe find that the extra dynamical phase coming from the pulses can shift\
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+    \ the\nphase of the Andreev reflection, resulting in the appear- ance of dynamical\n\
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+    Andreev states. As an application we study the presence of the zero bias peak\n\
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+    in the differential conductance of a normal-topological superconductor junction\n\
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+    - the simplest, yet somehow ambiguous, experimental signature for Majorana\nstates.\
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+    \ Adding microwave radiation to the measuring electrodes provides an\nunambiguous\
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+    \ probe of the Andreev nature of the zero bias peak."
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+  date: '2015-07-30T13:19:58Z'
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+  link: http://arxiv.org/abs/1411.6885v2
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+  ref: 1411.6885v2
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+  jref: Phys. Rev. B 92, 020513 (2015)
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+  jlink: http://dx.doi.org/10.1103/PhysRevB.92.020513
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+- title: AC Josephson effect without superconductivity
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+  authors:
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+  - Benoit Gaury
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+  - Joseph Weston
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+  - Xavier Waintal
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+  abstract: "Superconductivity derives its most salient features from the coherence\
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+    \ of its\nmacroscopic wave function. The associated physical phenomena have now\
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+    \ moved\nfrom exotic subjects to fundamental building blocks for quantum circuits\
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+    \ such\nas qubits or single photonic modes. Here, we theoretically find that the\
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+    \ AC\nJosephson effect---which transforms a DC voltage $V_b$ into an oscillating\n\
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+    signal $cos(2eV_b t/ \\hbar)$---has a mesoscopic counterpart in normal\nconductors.\
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+    \ We show that on applying a DC voltage $V_b$ to an electronic\ninterferometer,\
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+    \ there exists a universal transient regime where the current\noscillates at frequency\
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+    \ $eV_b/h$. This effect is not limited by a\nsuperconducting gap and could, in\
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+    \ principle, be used to produce tunable AC\nsignals in the elusive $0.1-10$ THz\
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+    \ \"terahertz gap\"."
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+  date: '2014-07-15T08:46:27Z'
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+  link: http://arxiv.org/abs/1407.3911v1
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+  ref: 1407.3911v1
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+  jref: Nature Communications 6, 6524 (2015)
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+  jlink: http://dx.doi.org/10.1038/ncomms7524
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+- title: Classical and quantum spreading of a charge pulse
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+  authors:
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+  - Benoit Gaury
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+  - Joseph Weston
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+  - Christoph Groth
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+  - Xavier Waintal
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+  abstract: "With the technical progress of radio-frequency setups, high frequency\
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+    \ quantum\ntransport experiments have moved from theory to the lab. So far the\
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+    \ standard\ntheoretical approach used to treat such problems numerically--known\
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+    \ as Keldysh\nor NEGF (Non Equilibrium Green's Functions) formalism--has not been\
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+    \ very\nsuccessful mainly because of a prohibitive computational cost. We propose\
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+    \ a\nreformulation of the non-equilibrium Green's function technique in terms\
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+    \ of the\nelectronic wave functions of the system in an energy-time representation.\
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+    \ The\nnumerical algorithm we obtain scales now linearly with the simulated time\
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+    \ and\nthe volume of the system, and makes simulation of systems with 10^5 - 10^6\n\
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+    atoms/sites feasible. We illustrate our method with the propagation and\nspreading\
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+    \ of a charge pulse in the quantum Hall regime. We identify a classical\nand a\
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+    \ quantum regime for the spreading, depending on the number of particles\ncontained\
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+    \ in the pulse. This numerical experiment is the condensed matter\nanalogue to\
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+    \ the spreading of a Gaussian wavepacket discussed in quantum\nmechanics textbooks."
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+  date: '2014-07-15T07:48:11Z'
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+  link: http://arxiv.org/abs/1406.7232v2
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+  ref: 1406.7232v2
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+  jref: "Proceedings of the 17th International Workshop on Computational\n  Electronics\
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+    \ (Paris, France, June 3-6, 2014), p1-p4. Published by IEEE"
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+  jlink: http://dx.doi.org/10.1109/IWCE.2014.6865808
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+- title: "Stopping electrons with radio-frequency pulses in the quantum Hall\n  regime"
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+  authors:
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+  - Benoit Gaury
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+  - Joseph Weston
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+  - Xavier Waintal
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+  abstract: "Most functionalities of modern electronic circuits rely on the possibility\
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+    \ to\nmodify the path fol- lowed by the electrons using, e.g. field effect\ntransistors.\
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+    \ Here we discuss the interplay between the modification of this\npath and the\
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+    \ quantum dynamics of the electronic flow. Specifically, we study\nthe propagation\
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+    \ of charge pulses through the edge states of a two-dimensional\nelectron gas\
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+    \ in the quantum Hall regime. By sending radio-frequency (RF)\nexcitations on\
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+    \ a top gate capacitively coupled to the electron gas, we\nmanipulate these edge\
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+    \ state dynamically. We find that a fast RF change of the\ngate voltage can stop\
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+    \ the propagation of the charge pulse inside the sample.\nThis effect is intimately\
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+    \ linked to the vanishing velocity of bulk states in\nthe quantum Hall regime\
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+    \ and the peculiar connection between momentum and\ntransverse confinement of\
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+    \ Landau levels. Our findings suggest new possibilities\nfor stopping, releasing\
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+    \ and switching the trajectory of charge pulses in\nquantum Hall systems."
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+  date: '2014-05-14T14:53:05Z'
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+  link: http://arxiv.org/abs/1405.3520v1
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+  ref: 1405.3520v1
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+  jref: Phys. Rev. B 90, 161305(R) (2014)
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+  jlink: http://dx.doi.org/10.1103/PhysRevB.90.161305
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+- title: Numerical simulations of time resolved quantum electronics
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+  authors:
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+  - Benoit Gaury
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+  - Joseph Weston
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+  - Matthieu Santin
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+  - Manuel Houzet
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+  - Christoph Groth
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+  - Xavier Waintal
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+  abstract: "This paper discusses the technical aspects - mathematical and numerical\
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+    \ -\nassociated with the numerical simulations of a mesoscopic system in the time\n\
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+    domain (i.e. beyond the single frequency AC limit). After a short review of the\n\
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+    state of the art, we develop a theoretical framework for the calculation of\n\
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+    time resolved observables in a general multiterminal system subject to an\narbitrary\
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+    \ time dependent perturbation (oscillating electrostatic gates, voltage\npulses,\
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+    \ time-vaying magnetic fields) The approach is mathematically equivalent\nto (i)\
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+    \ the time dependent scattering formalism, (ii) the time resolved Non\nEquilibrium\
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+    \ Green Function (NEGF) formalism and (iii) the partition-free\napproach. The\
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+    \ central object of our theory is a wave function that obeys a\nsimple Schrodinger\
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+    \ equation with an additional source term that accounts for\nthe electrons injected\
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+    \ from the electrodes. The time resolved observables\n(current, density. . .)\
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+    \ and the (inelastic) scattering matrix are simply\nexpressed in term of this\
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+    \ wave function. We use our approach to develop a\nnumerical technique for simulating\
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+    \ time resolved quantum transport. We find\nthat the use of this wave function\
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+    \ is advantageous for numerical simulations\nresulting in a speed up of many orders\
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+    \ of magnitude with respect to the direct\nintegration of NEGF equations. Our\
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+    \ technique allows one to simulate realistic\nsituations beyond simple models,\
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+    \ a subject that was until now beyond the\nsimulation capabilities of available\
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+    \ approaches."
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+  date: '2014-02-18T16:43:03Z'
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+  link: http://arxiv.org/abs/1307.6419v4
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+  ref: 1307.6419v4
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+  jref: Physics Reports 534, 1-37 (2014)
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+  jlink: http://dx.doi.org/10.1016/j.physrep.2013.09.001
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+<div class="pub-title"><a href="{{ .link }}">{{ .title }}</a></div>
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+<div class='pub-info'>
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+
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+    <div class='pub-authors'>
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+        <div class="pub-info-title">Authors:</div>
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+        <ul class="pub-authors">
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+        {{ range .authors }}
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+            <li class="{{ if (ne . site.Params.Author) }}pub-coauthor{{ end }}">
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+              {{ . }},
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+            </li>
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+        {{ end }}
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+        </ul>
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+    </div>
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+    <div class="pub-arxiv">
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+        <div class="pub-info-title">arXiv:</div> <a href="{{ .link }}">{{ .ref }}</a>
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+    </div>
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+    {{ if (and (isset . "jref") (isset . "jlink")) }}
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+    <div class='pub-jref'>
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+        <div class="pub-info-title">Published in:</div> <a href="{{ .jlink }}">{{ .jref}}</a>
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+    </div>
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+    {{ end }}
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+</div>
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+<ul class="publication-list">
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+{{ range .Site.Data.publications }}
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+<li class="publication">
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+{{ partial "publication.html" . }}
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+</li>
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+{{ end }}
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+</ul>
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+#!/usr/bin/env python3
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+
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+import sys
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+
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+from operator import itemgetter
6
+import feedparser
7
+from ruamel.yaml import YAML
8
+
9
+API_URL = "http://export.arxiv.org/api/query"
10
+DOI_URL = "http://dx.doi.org"
11
+
12
+
13
+def author_query(author):
14
+    """Return an Arxiv query fragment for an author.
15
+
16
+    Parameters
17
+    ----------
18
+    author: tuple
19
+        (firstname, surname)
20
+    """
21
+    return "au:" + "_".join(reversed(author))
22
+
23
+
24
+def search(author=(), max_results=100):
25
+    """Return all articles written by the author on Arxiv.
26
+
27
+    Parameters
28
+    ----------
29
+    author: tuple
30
+        (firstname, surname)
31
+
32
+    Returns
33
+    -------
34
+    Parsed Atom feed of articles
35
+    """
36
+    url = "{}?search_query={}&max_results={}".format(
37
+        API_URL, author_query(author), max_results
38
+    )
39
+    return feedparser.parse(url)
40
+
41
+
42
+def extract_publication(feed_article):
43
+    pub = dict()
44
+    pub["title"] = feed_article.title
45
+    pub["authors"] = [a.name for a in feed_article.authors]
46
+    pub["abstract"] = feed_article.summary
47
+    pub["date"] = feed_article.date
48
+    pub["link"] = feed_article.link
49
+    pub["ref"] = feed_article.link.split("/")[-1]
50
+    try:
51
+        pub["jref"] = feed_article.arxiv_journal_ref
52
+        pub["jlink"] = "/".join((DOI_URL, feed_article.arxiv_doi))
53
+    except AttributeError:
54
+        pass
55
+
56
+    return pub
57
+
58
+
59
+def main():
60
+    feed = search("Joseph Weston".split())
61
+    publications = sorted(
62
+        map(extract_publication, feed.entries), key=itemgetter("date"), reverse=True
63
+    )
64
+    YAML().dump(publications, sys.stdout)
65
+
66
+
67
+if __name__ == "__main__":
68
+    main()