论文标题
Andreev注入对纳米力学振动的冷却
Cooling of nanomechanical vibrations by Andreev injection
论文作者
论文摘要
考虑了一个纳米机电弱环节，该弱环节由两个正常电极之间的碳纳米管组成，在两个超导铅之间的间隙中悬浮在一起。纳米管被视为可移动的单级量子点，其中依赖于位置的超导级参数由于库珀对隧道而诱导。我们表明，电子隧道过程显着影响机械子系统的状态。我们发现，在电极之间施加的电压的给定方向上，机械子系统的固定状态具有玻尔兹曼形式，其有效温度取决于设备的参数。随着这种情况的发生，有效温度可以达到显着较小的值（冷却效果）。我们还证明，纳米管波动强烈影响通过系统的直流电流。后者可用于探测实验中的预测效应。
A nanoelectromechanical weak link composed of a carbon nanotube suspended between two normal electrodes in a gap between two superconducting leads is considered. The nanotube is treated as a movable single-level quantum dot in which the position-dependent superconducting order parameter is induced due to the Cooper pair tunneling. We show that electron tunneling processes significantly affect the state of the mechanical subsystem. We found that at a given direction of the applied voltage between the electrodes, the stationary state of the mechanical subsystem has a Boltzmann form with an effective temperature depended on the parameters of the device. As this takes place, the effective temperature can reach significantly small values (cooling effect). We also demonstrate that nanotube fluctuations strongly affect the dc current through the system. The latter can be used to probe the predicted effects in an experiment.
