[en] We propose and analyze a mechanism for rectification of spin transport through a small junction between two spin baths or leads. For interacting baths, we show that transport is conditioned on the spacial asymmetry of the quantum junction mediating the transport, and attribute this behavior to a gapped spectral structure of the lead-system-lead configuration. For noninteracting leads, a minimal quantum model that allows for spin rectification requires an interface of only two interacting two-level systems. In our paper, we have performed a thorough study of the current, including its time dependence and steady-state value. We obtain approximate results with a weak-coupling Born master equation in excellent agreement with matrix-product-state calculations that are extrapolated in time by mimicking absorbing boundary conditions. These results should be observable in controlled spin systems realized with cold atoms, trapped ions, or in electrons in quantum dot arrays.
Disciplines :
Physics
Author, co-author :
Mascarenhas, Eduardo; Department of Physics and SUPA, University of Strathclyde, Glasgow G4 0NG, Scotland, United Kingdom
Damanet, François ; Department of Physics and SUPA, University of Strathclyde, Glasgow G4 0NG, United Kingdom
Flannigan, Stuart; Department of Physics and SUPA, University of Strathclyde, Glasgow G4 0NG, Scotland, United Kingdom
Tagliacozzo, Luca; Department of Physics and SUPA, University of Strathclyde, Glasgow G4 0NG, Scotland, United Kingdom ; Departament de Física Quàntica i Astrofísica and Institut de Ciències del Cosmos (ICCUB), Universitat de Barcelona, Martí i Franquès 1, 08028 Barcelona, Catalonia, Spain
Daley, Andrew J.; Department of Physics and SUPA, University of Strathclyde, Glasgow G4 0NG, Scotland, United Kingdom
Goold, John; School of Physics, Trinity College Dublin, The University of Dublin, College Green Dublin 2, Ireland)
de Vega, Inés
Language :
English
Title :
Nonreciprocal quantum transport at junctions of structured leads
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