ac Josephson effect in resonant tunneling through mesoscopic superconducting junctions

作者：Zhu Y; Li W; Ma ZS; Lin TH^*; Sun QF

来源：Physical Review B, 2004, 69(2): 024518.

DOI：10.1103/PhysRevB.69.024518

We investigate the ac Josephson effect in resonant tunneling through mesoscopic superconducting junctions. In the presence of microwave irradiation, we show that the trajectory of multiple Andreev reflections can be closed by emitting or absorbing photons. Consequently, photon-assisted Andreev states are formed and play the role of carrying supercurrent. On the Shapiro steps [eV=(N/2)(h) over bar omega], a dc component appears when the resonant level E-0 is near the series of positions 1/2 m (h) over bar omega, where N and m are integers, omega is the frequency of the microwave field, and V is the dc voltage across the superconducting junction. An analytical result is derived in the limit of Delta-->infinity, based on which new features of the ac Josephson effect are revealed.

• 出版日期2004-1
• 单位北京大学