摘要
We study the effects of infrared radiation on a two-dimensional Bardeen-Cooper-Schrieffer superconductor coupled with a normal metal substrate through a tunneling barrier.The phase transition is analyzed by inspecting the stability of the system against perturbations of pairing potentials.We find an oscillating gap phase with a frequency not directly related to the radiation frequency,but instead resulting from the asymmetry of electron density of states of the system as well as the tunneling amplitude.When such a superconductor is in contact with another superconductor,gives rise to an unusual alternating Josephson current.
We study the effects of infrared radiation on a two-dimensional Bardeen-Cooper-Schrieffer superconductor coupled with a normal metal substrate through a tunneling barrier.The phase transition is analyzed by inspecting the stability of the system against perturbations of pairing potentials.We find an oscillating gap phase with a frequency not directly related to the radiation frequency,but instead resulting from the asymmetry of electron density of states of the system as well as the tunneling amplitude.When such a superconductor is in contact with another superconductor,gives rise to an unusual alternating Josephson current.
作者
Hui-Ying Liu
Jun-Ren Shi
刘慧颖;施均仁(International Center for Quantum Materials,Peking University;International Center for Quantum MaterialsPeking University;Collaborative Innovation Center of Quantum Matter)
基金
Supported by the National Basic Research Program of China under Grant No 2015CB921101
the National Natural Science Foundation of China under Grant No 11325416
