Effects of phase coherence on local density of states in superconducting proximity structures

Shu-Ichiro Suzuki; Alexander A. Golubov; Yasuhiro Asano; Yukio Tanaka

doi:10.1103/PhysRevB.100.024511

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Effects of phase coherence on local density of states in superconducting proximity structures

Shu-Ichiro Suzuki, Alexander A. Golubov, Yasuhiro Asano, Yukio Tanaka

DOI 10.1103/PhysRevB.100.024511 · Physical Review B

T1

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Abstract

We theoretically study the local density of states in superconducting proximity structures where two superconducting terminals are attached to a side surface of a normal-metal wire. Using the quasiclassical Green's function method, the energy spectrum is obtained for both spin-singlet s-wave and spin-triplet p-wave junctions. In both cases, the decay length of the proximity effect at zero temperature is limited by a depairing effect due to inelastic scattering. In addition to the depairing effect, in p-wave junctions the decay length depends sensitively on the transparency at the junction interfaces, which is a unique property of odd-parity superconductors where the anomalous proximity effect occurs.