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arXiv 1504.07412cond-mat.stat-mech
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弱耦合以外非相互作用输运的稳态热力学

Steady-state thermodynamics of non-interacting transport beyond weak coupling

Gabriel E. Topp, Tobias Brandes, Gernot Schaller

摘要:

我们研究了弱耦合范围之外的简单(非相互作用)输运模型的热力学。对于一个单一的费米子或玻色子水平-隧道耦合到两个水库-固定的物质和能量流的精确表达式来自海森堡运动方程的解决方案。明确地证明了稳态熵产生率的正性。最后,对于一个配置中,粒子被向上泵的化学势由一个向下的温度梯度,我们证明了这个过程的热力学效率降低时,系统和水库之间的耦合强度增加,作为一个直接后果的损失之间的紧密耦合的能量和物质流。

英文摘要:

We investigate the thermodynamics of simple (non-interacting) transport models beyond the scope of weak coupling. For a single fermionic or bosonic level -- tunnel-coupled to two reservoirs -- exact expressions for the stationary matter and energy current are derived from the solutions of the Heisenberg equations of motion. The positivity of the steady-state entropy production rate is demonstrated explicitly. Finally, for a configuration in which particles are pumped upwards in chemical potential by a downward temperature gradient, we demonstrate that the thermodynamic efficiency of this process decreases when the coupling strength between system and reservoirs is increased, as a direct consequence of the loss of a tight coupling between energy and matter currents.

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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