Conductance characteristics between a normal metal and a clean superconductor carrying a supercurrent
Degang Zhang, C. S. Ting, C.-R. Hu
DOI 10.1103/PhysRevB.70.172508 · Physical Review B
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Abstract
The effect of a transverse supercurrent Is up to the thermodynamic critical current on the low-temperature conductance characteristics between a normal metal N and a clean s- or d-wave superconductor (S) is theoretically investigated, covering from metallic contact (z=0) to the tunneling limit (z⪢1). For d-wave S both (100) and (110) contacts are studied. Many features found are due to current-induced gap anisotropy and requires S to be in the clean limit. Near critical Is and for z≃1, a three-humped structure appears for both s-wave S and d-wave S with (100) contact, signaling onset of current-induced gaplessness on the Fermi surface where gap originally exists.
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