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 $I_s$ parallel to the interface is theoretically investigated. Increasing $I_s$ 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.

4 pages, 4 figures

References in corpus (3)

• Tunneling into Current-Carrying Surface States of High T${}_c$ Superconductors
• Density of states in a superconductor carrying a supercurrent
• Andreev reflections on Y1-xCaxBa2Cu3O7-delta evidence for an unusual proximity effect

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