Coherent backaction between spins and an electronic bath: Non-Markovian dynamics and low-temperature quantum thermodynamic electron cooling
Coherent backaction between spins and an electronic bath: Non-Markovian dynamics and low-temperature quantum thermodynamic electron cooling
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DOI：
10.1103/physrevb.100.134308
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发表时间：
2019-05
影响因子：
3.7
通讯作者：
S. Matern;D. Loss;J. Klinovaja;B. Braunecker
中科院分区：
文献类型：
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作者：
S. Matern;D. Loss;J. Klinovaja;B. Braunecker
我们提供了一个多功能的分析框架，用于计算自旋系统的动力学接触的费米子浴超越马尔可夫近似。该方法是基于二阶扩展的Nakajima-Zwanzig主方程，但系统地包括所有的量子相干记忆效应，导致非马尔可夫动力学。我们的结果描述了，对于自由感应衰减，完整的时间范围从非马尔可夫动力学在短时间内，众所周知的指数热衰减在长时间。我们提供了完整的分析结果，为整个时间范围内使用浴巡回电子作为一个原型的普遍量子波动。此外，我们提出了一个量子热力学方案，利用非马尔可夫衰变的温度不敏感性，将热量从电子系统中传输出去，从而通过重复重新初始化自旋簇，在非常低的温度下有效地冷却电子。
We provide a versatile analytical framework for calculating the dynamics of a spin system in contact with a fermionic bath beyond the Markov approximation. The approach is based on a second-order expansion of the Nakajima-Zwanzig master equation but systematically includes all quantum coherent memory effects leading to non-Markovian dynamics. Our results describe, for the free induction decay, the full time range from the non-Markovian dynamics at short times, to the well-known exponential thermal decay at long times. We provide full analytic results for the entire time range using a bath of itinerant electrons as an archetype for universal quantum fluctuations. Furthermore, we propose a quantum thermodynamic scheme to employ the temperature insensitivity of the non-Markovian decay to transport heat out of the electron system and thus, by repeated reinitialization of a cluster of spins, to efficiently cool the electrons at very low temperatures.