Nonreciprocal quantum transport at junctions of structured leads

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Mascarenhas, Eduardo and Damanet, François and Flannigan, Stuart and Tagliacozzo, Luca and Daley, Andrew J. and Goold, John and De Vega, Inés (2019) Nonreciprocal quantum transport at junctions of structured leads. Physical Review B, 99 (24). 245134. ISSN 2469-9950 (https://doi.org/10.1103/PhysRevB.99.245134)

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Abstract

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.

ORCID iDs

Mascarenhas, Eduardo, Damanet, François, Flannigan, Stuart, Tagliacozzo, Luca ORCID logoORCID: https://orcid.org/0000-0002-5858-1587, Daley, Andrew J. ORCID logoORCID: https://orcid.org/0000-0001-9005-7761, Goold, John and De Vega, Inés;
  • Item type:Article
    ID code:69389
    Dates:
    Date
    Event
    19 June 2019
    Published
    10 April 2019
    Accepted
    Subjects:Science > Physics
    Department:Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:15 Aug 2019 11:14
    Last modified:11 Nov 2024 12:24
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/69389
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