Inter-Landau-level Andreev Reflection at the Dirac Point in a Graphene Quantum Hall State Coupled to a NbSe2 Superconductor

Sahu, Manas Ranjan; Liu, Xin; Paul, Arup Kumar; Das, Sourin; Raychaudhuri, Pratap; Jain, J. K.; Das, Anindya

doi:10.1103/PhysRevLett.121.086809

Title: Inter-Landau-level Andreev Reflection at the Dirac Point in a Graphene Quantum Hall State Coupled to a ${NbSe}_{2}$ Superconductor

Journal Article · Fri Aug 24 00:00:00 EDT 2018 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.121.086809· OSTI ID:1489113

Sahu, Manas Ranjan ^[1]; Liu, Xin ^[2]; Paul, Arup Kumar ^[1]; Das, Sourin ^[3]; Raychaudhuri, Pratap ^[4]; Jain, J. K. ^[5]; Das, Anindya ^[1]

Indian Institute of Science, Bangalore (India)
Huazhong Univ. of Science and Technology, Wuhan (China)
Indian Institute of Science Education and Research, Mohanpur (India)
Tata Institute of Fundamental Research, Mumbai (India)
The Pennsylvania State Univ., University Park, PA (United States)

Superconductivity and quantum Hall effect are distinct states of matter occurring in apparently incompatible physical conditions. Recent theoretical developments suggest that the coupling of quantum Hall effect with a superconductor can provide a fertile ground for realizing exotic topologi- cal excitations such as non-abelian Majorana fermions or Fibonacci particles. As a step toward that goal, we report observation of Andreev reflection at the junction of a quantum Hall edge state in a single layer graphene and a quasi-two dimensional niobium diselenide (NbSe₂) superconductor. Our principal finding is the observation of an anomalous finite-temperature conductance peak located precisely at the Dirac point, providing a definitive evidence for inter-Landau level Andreev reflection in a quantum Hall system. Our observations are well supported by detailed numerical simulations, which offer additional insight into the role of the edge states in Andreev physics. As a result, this study paves the way for investigating analogous Andreev reflection in a fractional quantum Hall system coupled to a superconductor to realize exotic quasiparticles.

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Research Organization:: Pennsylvania State Univ., University Park, PA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0005042; 2016YFA0401003

OSTI ID:: 1489113

Alternate ID(s):: OSTI ID: 1466437

Journal Information:: Physical Review Letters, Vol. 121, Issue 8; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 24 works

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Title: Inter-Landau-level Andreev Reflection at the Dirac Point in a Graphene Quantum Hall State Coupled to a ${NbSe}_{2}$ Superconductor