Controllable Andreev Retroreflection and Specular Andreev Reflection in a Four-Terminal Graphene-Superconductor Hybrid System

Shu Guang Cheng*, Yanxia Xing, Jian Wang, Qing Feng Sun

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

82 Citations (Scopus)

Abstract

We report the investigation of electron transport through a four-terminal graphene-superconductor hybrid system. Because of the quantum interference of the reflected holes from two graphene-superconductor interfaces with a phase difference θ, it is found that the specular Andreev reflection vanishes at θ=0 while the Andreev retroreflection disappears at θ=π. This means that retroreflection and specular reflection can be easily controlled and separated in this device. In addition, because of the diffraction effect in the narrow graphene nanoribbon, the reflected hole can exit from both graphene terminals. As the width of nanoribbon increases, the diffraction effect gradually disappears and the reflected hole eventually exits from a particular graphene terminal depending on the type of Andreev reflection.

Original languageEnglish
Article number167003
JournalPhysical Review Letters
Volume103
Issue number16
DOIs
Publication statusPublished - 16 Oct 2009
Externally publishedYes

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