Andreev Reflection in the Fractional Quantum Hall State

Gül, Önder; Ronen, Yuval; Lee, Si Young; Shapourian, Hassan; Zauberman, Jonathan; Lee, Young Hee; Watanabe, Kenji; Taniguchi, Takashi; Vishwanath, Ashvin; Yacoby, Amir; Kim, Philip

doi:10.1103/PhysRevX.12.021057

Title: Andreev Reflection in the Fractional Quantum Hall State

Journal Article · Tue Jun 14 00:00:00 EDT 2022 · Physical Review. X

DOI:https://doi.org/10.1103/PhysRevX.12.021057· OSTI ID:1872502

;

; Lee, Si Young; Shapourian, Hassan; Zauberman, Jonathan;

;

; Taniguchi, Takashi; Vishwanath, Ashvin; Yacoby, Amir; Kim, Philip

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.

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Research Organization:: Harvard Univ., Cambridge, MA (United States)

Sponsoring Organization:: USDOE Office of Science (SC); Netherlands Organization for Scientific Research (NWO); National Science Foundation (NSF); Institute for Basic Science (IBS); Simons Foundation; Ministry of Education, Culture, Sports, Science and Technology (MEXT); Japan Society for the Promotion of Science (JSPS)

Grant/Contract Number:: SC0012260; SC0019300; MPS 1936263; IBS-R011-D1; 651440; DMR-1708688; DMR-1231319; JPMXP0112101001; 19H05790; JP20H00354; ECS-00335765

OSTI ID:: 1872502

Alternate ID(s):: OSTI ID: 1980369

Journal Information:: Physical Review. X, Journal Name: Physical Review. X Vol. 12 Journal Issue: 2; ISSN 2160-3308

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Andreev Reflection in the Fractional Quantum Hall State

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