Conductance Characteristics between a Normal Metal and a Superconductor Carrying a Supercurrent

Details Conductance Characteristics between a Normal Metal and a Superconductor Carrying a Supercurrent Conductance Characteristics between a Normal Metal and a Superconductor Carrying a Supercurrent

2003-12-22

arxiv.org/abs/cond-mat/0312545v1

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures

Scientific paper

10.1103/PhysRevB.70.172508

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.

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