Phenomenological theory of zero-energy Andreev resonant states

Yasuhiro Asano; Yukio Tanaka; Satoshi Kashiwaya

doi:10.1103/PhysRevB.69.134501

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Phenomenological theory of zero-energy Andreev resonant states

Yasuhiro Asano, Yukio Tanaka, Satoshi Kashiwaya

DOI 10.1103/PhysRevB.69.134501 · Physical Review B

T1

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Abstract

A conceptual consideration is given to a zero-energy state (ZES) at the surface of unconventional superconductors. The reflection coefficients in normal-metal/superconductor (NS) junctions are calculated based on a phenomenological description of the reflection processes of a quasiparticle. The phenomenological theory reveals the importance of the sign change in the pair potential for the formation of the ZES. The ZES is observed as the zero-bias conductance peak (ZBCP) in the differential conductance of NS junctions. The split of the ZBCP due to broken time-reversal symmetry states is naturally understood in the present theory. We also discuss effects of external magnetic fields on the ZBCP.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
La3Ni2O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown