Driven Brownian particle as a paradigm for a nonequilibrium heat bath: Effective temperature and cyclic work extraction.
Driven Brownian particle as a paradigm for a nonequilibrium heat bath: Effective temperature and cyclic work extraction.
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驱动布朗粒子作为非平衡热浴的范例：有效温度和循环功提取
DOI：
10.1103/physreve.95.050103
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
U. Seifert
中科院分区：
文献类型：
--
作者：
R. Wulfert;M. Oechsle;T. Speck;U. Seifert
我们将基于波动耗散比的频率相关有效温度的概念应用于非平衡稳态下的驱动布朗粒子。使用该系统作为弱耦合谐波振荡器的恒温器，振荡器根据整个频谱上各自有效温度的规范分布进行热化。通过将振荡器从无源温度计转变为热机，我们实现了从单个热库中循环提取功，这仅由于其非平衡性质而可行。
We apply the concept of a frequency-dependent effective temperature based on the fluctuation-dissipation ratio to a driven Brownian particle in a nonequilibrium steady state. Using this system as a thermostat for a weakly coupled harmonic oscillator, the oscillator thermalizes according to a canonical distribution at the respective effective temperature across the entire frequency spectrum. By turning the oscillator from a passive thermometer into a heat engine, we realize the cyclic extraction of work from a single thermal reservoir, which is feasible only due to its nonequilibrium nature.