Quantum engine based on many-body localization
Quantum engine based on many-body localization
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DOI：
10.1103/physrevb.99.024203
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发表时间：
2019-01-22
影响因子：
3.7
通讯作者：
Refael, Gil
中科院分区：
文献类型：
--
作者：
Halpern, Nicole Yunger;White, Christopher David;Refael, Gil
多体定域(MBL)系统在其本征动力学作用下不会发生热化。我们认为，MBL的绝热性可以用于热力学任务。我们通过建立量子多体系统的奥托发动机循环来说明这种能力。系统在强局域MBL区和热(或弱局域)区之间倾斜。MBL系统和热力系统的能级关联之间的差异使中尺度发动机能够在热力学极限下并行运行，提高了发动机的可靠性，并抑制了最坏情况的试验。我们对发动机的效率和每循环功率进行了解析估计和数值计算。这一效率反映了传统热力学奥托发动机的效率。每周期功率与系统大小成线性关系，与局部化长度成反比指数关系。这项工作将热力学透镜引入到MBL中，最近已经研究了它，现在可以考虑用于热力学任务。
Many-body-localized (MBL) systems do not thermalize under their intrinsic dynamics. The athermality of MBL, we propose, can be harnessed for thermodynamic tasks. We illustrate this ability by formulating an Otto engine cycle for a quantum many-body system. The system is ramped between a strongly localized MBL regime and a thermal (or weakly localized) regime. The difference between the energy-level correlations of MBL systems and of thermal systems enables mesoscale engines to run in parallel in the thermodynamic limit, enhances the engine's reliability, and suppresses worst-case trials. We estimate analytically and calculate numerically the engine's efficiency and per-cycle power. The efficiency mirrors the efficiency of the conventional thermodynamic Otto engine. The per-cycle power scales linearly with the system size and inverse-exponentially with a localization length. This work introduces a thermodynamic lens onto MBL, which, having been studied much recently, can now be considered for use in thermodynamic tasks.