Conductance Characteristics between a Normal Metal and a Superconductor Carrying a Supercurrent
Abstract
The low-temperature conductance (G) characteristics between a normal metal and a clean superconductor (S) carrying a supercurrent Is parallel to the interface is theoretically investigated. Increasing Is causes lowering and broadening of (1) coherence peaks of s-wave S, and d-wave S at (100) contact, (2) midgap-states-induced zero-bias conductance peak for d-wave S at (110) contact, and (3) Andreev-reflection-induced enhancement of G within the gap near the metallic-contact limit. Novel features found include a current-induced central peak and a three-humped structure at intermediate barrier strength, etc.
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