Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2009-10-24
Phys. Rev. Lett. 103, 167003 (2009)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
4 pages, 5 figures
Scientific paper
We report the investigation of electron transport through a four-terminal graphene-superconductor hybrid system. Due to the quantum interference of the reflected holes from two graphene-superconductor interfaces with 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 the retroreflection and specular reflection can be easily controlled and separated in this device. In addition, due to 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.
Cheng Shu-guang
Sun Qing-feng
Wang Jian
Xing Yanxia
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