3 SIGNATURES OF PHASE-COHERENT ANDREEV REFLECTION | |
Note | |
关键词: QUANTUM TRANSPORT; MESOSCOPIC WIRES; CONDUCTANCE; SUPERCONDUCTOR; FLUCTUATIONS; MICROJUNCTIONS; LOCALIZATION; SYSTEMS; | |
DOI : 10.1103/PhysRevB.48.2811 | |
来源: SCIE |
【 摘 要 】
An efficient numerical scheme is developed to compute the differential conductance G(NS) of a disordered normal-metal-superconductor (NS) junction at voltages V and magnetic fields B. A sharp peak is found in G(NS) around V, B = 0 in the case of a resistive NS interface, as observed experimentally and confirming the theory of ''reflectionless tunneling.'' An ideal interface shows a conductance dip, due to an enhanced weak-localization effect. Finally, it is demonstrated that time-reversal-symmetry breaking does not reduce the ''universal conductance fluctuations'' in G(NS) by a factor of 2.
【 授权许可】
Free