Goos-Hänchen-like shifts at a metal/superconductor interface GOOS-HÄNCHEN-LIKE SHIFTS at A ... LIU, YU, JIANG, and YANG

Ying Liu, Zhi Ming Yu, Hua Jiang, Shengyuan A. Yang

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

At a normal-metal/superconductor interface, an incident electron from the normal-metal (N) side can be normally reflected as an electron or Andreev reflected as a hole. We show that pronounced lateral shifts along the interface between the incident and the reflected quasiparticles can happen in both reflection processes, which are analogous to the Goos-Hänchen effect in optics. Two concrete model systems are considered. For the simplest model in which the N side is of the two-dimensional electron gas, we find that while the shift in Andreev reflection stays positive, the shift in normal reflection can be made either positive or negative, depending on the excitation energy. For the second model with the N side taken by graphene, the shift in Andreev reflection can also be made negative, and the shifts have rich behavior due to the additional sublattice pseudospin degree of freedom. We show that the shift strongly modifies the dispersion for the confined waveguide modes in an SNS structure. We also suggest a possible experimental setup for detecting the shift.

Original languageEnglish
Article number075151
JournalPhysical Review B
Volume98
Issue number7
DOIs
Publication statusPublished - 28 Aug 2018
Externally publishedYes

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