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Andreev Reflection in the Fractional Quantum Hall State

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Title
Andreev Reflection in the Fractional Quantum Hall State
Author(s)
Gül, Önder; Ronen, Yuval; Si Young Lee; Shapourian, Hassan; Zauberman, Jonathan; Young Hee Lee; Watanabe, Kenji; Taniguchi, Takashi; Vishwanath, Ashvin; Yacoby, Amir; Kim, Philip
Publication Date
2022-06
Journal
Physical Review X, v.12, no.2
Publisher
American Physical Society
Abstract
Published by the American Physical Society.We construct high-quality graphene-based van der Waals devices with narrow superconducting niobium nitride (NbN) electrodes, in which superconductivity and a robust fractional quantum Hall (FQH) state coexist. We find a possible signature for crossed Andreev reflection (CAR) across the superconductor separating two FQH edges. Our observed CAR probabilities in the particlelike fractional fillings are markedly higher than those in the integer and hole-conjugate fractional fillings and depend strongly on temperature and magnetic field unlike the other fillings. Further, we find a filling-independent CAR probability in integer fillings, which we attribute to spin-orbit coupling in NbN allowing for Andreev reflection between spin-polarized edges. These results provide a route to realize novel topological superconducting phases in FQH-superconductor hybrid devices based on graphene and NbN.
URI
https://pr.ibs.re.kr/handle/8788114/12160
DOI
10.1103/PhysRevX.12.021057
ISSN
2160-3308
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > 1. Journal Papers (저널논문)
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