Title:	Nonequilibrium Electrical, Thermal and Spin Transport in Open Quantum Systems of Topological Superconductors, Semiconductors and Metals
Authors:	Bondyopadhaya, Nilanjan Roy, Dibyendu
Keywords:	Condensed Matter - Mesoscale and Nanoscale Physics Condensed Matter - Superconductivity
Issue Date:	4-Mar-2022
Publisher:	Springer
Citation:	Journal of Statistical Physics, 2022,Vol. 187, Article No. 11
Abstract:	We study nonequilibrium transport in various open quantum systems whose systems and leads/baths are made of topological superconductors (TSs), semiconductors, and metals. Using quantum Langevin equations and Green's function method, we derive exact expressions for steady-state electrical, thermal, and spin current at the junctions between a system and leads. We validate these current expressions by comparing them with the results from direct time-evolution simulations. We then show how an electrical current injected in TS wires divides into two parts carried by single electronic excitations and Cooper pairs. We further show ballistic thermal transport in an open TS wire in the topological phase under temperature or voltage bias. The thermal current values grow significantly near the topological phase transition, where thermal conductance displays a sharp quantized peak as predicted earlier. We relate the quantized thermal conductance to the zero-frequency thermoelectric transmission coefficient of the open TS wire. We also observe a large thermoelectric current near the topological transition of the TS wires. The role of superconducting baths in transport is demonstrated by thoroughly examining the features of zero-temperature differential electrical conductance and thermal conductance in open systems with TS baths.
Description:	Restricted Access. An open-access version is available at arXiv.org (one of the alternative locations)
URI:	http://hdl.handle.net/2289/7903
ISSN:	00224715 15729613
Alternative Location:	https://arxiv.org/abs/2010.08336 https://doi.org/10.1007/s10955-022-02902-w https://ui.adsabs.harvard.edu/abs/2020arXiv201008336B/abstract
Copyright:	2022 The Author(s)
Appears in Collections:	Research Papers (TP)

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