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arXiv 0903.3671cond-mat.str-el
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一维自旋异质结中的热输运

Thermal transport in one-dimensional spin heterostructures

Liliana Arrachea, Gustavo S. Lozano, A. A. Aligia

摘要:

研究了一维非均匀自旋1/2量子系统中的热输运。它由一个有限大小的XX自旋链在其末端耦合到不同温度下的半无限XX和XY链组成,这些链起着热量和自旋库的作用。在使用Jordan-Wigner变换后,我们将原来的自旋哈密顿量映射成一个费米子哈密顿量,它包含正常和配对项。我们找到的热流的表达式和解决问题的非平衡格林函数形式主义。我们分析了热流的行为作为模型参数的函数。当有限磁场施加在两个水库,系统表现出整流效应的热流。

英文摘要:

We study heat transport in a one-dimensional inhomogeneous quantum spin 1/2 system. It consists of a finite-size XX spin chain coupled at its ends to semi-infinite XX and XY chains at different temperatures, which play the role of heat and spin reservoirs. After using the Jordan-Wigner transformation we map the original spin Hamiltonian into a fermionic Hamiltonian, which contains normal and pairing terms. We find the expressions for the heat currents and solve the problem with a non-equilibrium Green's function formalism. We analyze the behavior of the heat currents as functions of the model parameters. When finite magnetic fields are applied at the two reservoirs, the system exhibits rectification effects in the heat flow.

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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