Department of Physics, National Central University, Zhongli 32001, Taiwan.
Phys Rev E. 2017 Sep;96(3-1):032123. doi: 10.1103/PhysRevE.96.032123. Epub 2017 Sep 15.
We study experimentally and theoretically the steady-state dynamics of a simple stochastic electronic system featuring two resistor-capacitor circuits coupled by a third capacitor. The resistors are subject to thermal noises at real temperatures. The voltage fluctuation across each resistor can be compared to a one-dimensional Brownian motion. However, the collective dynamical behavior, when the resistors are subject to distinct thermal baths, is identical to that of a Brownian gyrator, as first proposed by Filliger and Reimann [Phys. Rev. Lett. 99, 230602 (2007)PRLTAO0031-900710.1103/PhysRevLett.99.230602]. The average gyrating dynamics is originated from the absence of detailed balance due to unequal thermal baths. We look into the details of this stochastic gyrating dynamics, its dependences on the temperature difference and coupling strength, and the mechanism of heat transfer through this simple electronic circuit. Our work affirms the general principle and the possibility of a Brownian ratchet working near room temperature scale.
我们通过实验和理论研究了一个简单的随机电子系统的稳态动力学，该系统由两个电阻-电容电路通过第三个电容耦合而成。电阻器在实际温度下受到热噪声的影响。每个电阻器上的电压波动可以与一维布朗运动进行比较。然而，当电阻器处于不同的热浴中时，集体动力学行为与 Filliger 和 Reimann 首次提出的布朗回旋仪相同[Phys. Rev. Lett. 99, 230602 (2007)PRLTAO0031-900710.1103/PhysRevLett.99.230602]。回旋运动的平均动力学源自由于热浴不均匀而缺乏详细平衡。我们研究了这种随机回旋动力学的细节，包括其对温度差和耦合强度的依赖性，以及通过这个简单电子电路传热的机制。我们的工作证实了布朗棘轮在接近室温范围内工作的一般原理和可能性。
