期刊
JOURNAL OF STATISTICAL MECHANICS-THEORY AND EXPERIMENT
卷 -, 期 -, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1742-5468/2013/07/P07007
关键词
spin chains; ladders and planes (theory); driven diffusive systems (theory); quantum transport in one dimension; heat conduction
资金
- HECToR under the University dCSE scheme provided by NAG
- CCPQ flagship project [EP/J010529/1]
- National Research Foundation
- Ministry of Education of Singapore
- EPSRC [EP/J010529/1, EP/K038311/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/J010529/1, EP/K038311/1] Funding Source: researchfish
In this work we study the heat transport in an XXZ spin-1/2 Heisenberg chain with homogeneous magnetic field, incoherently driven out of equilibrium by reservoirs at the boundaries. We focus on the effect of bulk dephasing (energy-dissipative) processes in different parameter regimes of the system. The non-equilibrium steady state of the chain is obtained by simulating its evolution under the corresponding Lindblad master equation, using the time evolving block decimation method. In the absence of dephasing, the heat transport is ballistic for weak interactions, while being diffusive in the strongly interacting regime, as evidenced by the heat current scaling with the system size. When bulk dephasing takes place in the system, diffusive transport is induced in the weakly interacting regime, with the heat current monotonically decreasing with the dephasing rate. In contrast, in the strongly interacting regime, the heat current can be significantly enhanced by dephasing for systems of small size.
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