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arXiv 1106.3207cond-mat.stat-mechcond-mat.mes-hall
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稳态量子输运的非平衡密度矩阵描述

Nonequilibrium density matrix description of steady state quantum transport

Abhishek Dhar, Keiji Saito, Peter Hanggi

摘要:

利用这项工作,我们研究了与水库连接的中间量子系统的载流非平衡稳态的定态非平衡密度矩阵。我们描述的分析过程,以获得显式的结果时,系统,连接水库,以及系统-水库相互作用的量子输运的约化密度矩阵描述的二次哈密顿。我们的程序是详细的,电子运输所描述的紧束缚哈密顿和声子运输所描述的谐波哈密顿。对于弱系统-储层耦合的特殊情况,得到了稳态密度矩阵的更详细的描述。阐明了几种用于电极间电子输运和低维声子热通量的范例输运设置。

英文摘要:

With this work we investigate the stationary nonequilibrium density matrix of current carrying nonequilibrium steady states of in-between quantum systems that are connected to reservoirs. We describe the analytical procedure to obtain the explicit result for the reduced density matrix of quantum transport when the system, the connecting reservoirs and, as well, the system-reservoir interactions are described by quadratic Hamiltonians. Our procedure is detailed for both, electronic transport described by the tight-binding Hamiltonian and for phonon transport described by harmonic Hamiltonians. For the special case of weak system-reservoir couplings, a more detailed description of the steady-state density matrix is obtained. Several paradigm transport setups for inter-electrode electron transport and low-dimensional phonon heat flux are elucidated.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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