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Entropy 2019, 21(3), 228; https://doi.org/10.3390/e21030228

Transport and Energetic Properties of a Ring of Interacting Spins Coupled to Heat Baths

1
Science and Math Cluster, Singapore University of Technology and Design, 8 Somapah Road, Singapore 487372, Singapore
2
Department of Physics, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland
3
EPD Pillar, Singapore University of Technology and Design, 8 Somapah Road, Singapore 487372, Singapore
4
MajuLab, CNRS-UCA-SU-NUS-NTU International Joint Research Unit, Singapore 117543, Singapore
*
Author to whom correspondence should be addressed.
Received: 29 December 2018 / Revised: 1 February 2019 / Accepted: 26 February 2019 / Published: 27 February 2019
(This article belongs to the Special Issue Quantum Thermodynamics II)
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Abstract

We study the heat and spin transport properties in a ring of interacting spins coupled to heat baths at different temperatures. We show that interactions, by inducing avoided crossings, can be a means to tune both the total heat current flowing between the ring and the baths, and the way it flows through the system. In particular, we recognize three regimes in which the heat current flows clockwise, counterclockwise, and in parallel. The temperature bias between the baths also induces a spin current within the ring, whose direction and magnitude can be tuned by the interaction. Lastly, we show how the ergotropy of the nonequilibrium steady state can increase significantly near the avoided crossings. View Full-Text
Keywords: quantum transport; quantum thermodynamics; open quantum systems; spin chains quantum transport; quantum thermodynamics; open quantum systems; spin chains
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Xu, X.; Choo, K.; Balachandran, V.; Poletti, D. Transport and Energetic Properties of a Ring of Interacting Spins Coupled to Heat Baths. Entropy 2019, 21, 228.

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