Radiation-Induced Oscillating Gap States of Nonequilibrium Two-Dimensional Superconductors

• 来源期刊: 中国物理快报（英文版）
• 年，卷（期）: 2018,（6）
• 页码范围: 75-78
• 页数: 4页
• 语种: 英文
• DOI: 10.1088/0256-307X/35/6/067401

摘要

We study the effects of infrared radiation on a two-dimensionai 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.