Phase-dependent multiple Andreev reflections in SNS interferometers | |
Article | |
关键词: SCATTERING-THEORY; TRANSPORT; JUNCTIONS; INTERFERENCE; CONTACTS; NOISE; | |
DOI : 10.1103/PhysRevB.65.134523 | |
来源: SCIE |
【 摘 要 】
A theory of coherent multiple Andreev reflections (MAR) is developed for superconductor-normal-metal-superconductor interferometers. We consider a Y-shaped normal-electron-beam splitter connecting two superconducting reservoirs, where the two connection points to the same superconductor can have different phases. The current is calculated in the quantum transport regime as a function of applied voltage and phase difference, I(V,phi). MAR in interferometers incorporate two features: interference in the arms of the splitter, and interplay with Andreev resonances. The latter feature yields enhancement of the subgap current and current peaks with phase-dependent positions and magnitudes. The interference effect leads to suppression of the subgap current and complete disappearance of the current peaks at phi=pi. The excess current at large voltage decreases and changes sign with increasing phase difference.
【 授权许可】
Free