2009/10/16 by Shu-guang Cheng, Yanxia Xing, Jian Wang +2 · 1 citation
Materials Science · Physics and Astronomy · #Andreev reflection #Condensed matter physics #Diffraction #Electron #Electron diffraction #Graphene #Graphene research and applications #Laser #Optics #Physics #Quantum and electron transport phenomena #Quantum mechanics #Reflection (computer programming) #Retroreflector #Specular reflection #Superconductivity #Surface and Thin Film Phenomena #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevlett.103.167003
published as Phys. Rev. Lett. 103, 167003 (2009) · 4 pages, 5 figures
openalex publication_date 2009/10/16 · arxiv created 2009/10/24 · arxiv updated 2015/05/14 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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 theta, it is found that the specular Andreev reflection vanishes at theta=0 while the Andreev retroreflection disappears at theta=pi. 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.