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Heat transport in the XXZ spin chain:from ballistic to diffusive regimes and dephasing enhancement


Reference:

Mendoza-Arenas, J. J., Al-Assam, S., Clark, S. R. and Jaksch, D., 2013. Heat transport in the XXZ spin chain:from ballistic to diffusive regimes and dephasing enhancement. Journal of Statistical Physics

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    Official URL:

    http://dx.doi.org/10.1088/1742-5468/2013/07/P07007

    Abstract

    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.

    Details

    Item Type Articles
    CreatorsMendoza-Arenas, J. J., Al-Assam, S., Clark, S. R. and Jaksch, D.
    DOI10.1088/1742-5468/2013/07/P07007
    Uncontrolled Keywordscond-mat.str-el,quant-ph
    DepartmentsFaculty of Science > Physics
    Publisher Statement1303.6353v2: The final publication is available at Springer via http://dx.doi.org/10.1088/1742-5468/2013/07/P07007
    RefereedYes
    StatusPublished
    ID Code47343

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