Inter-Landau-level Andreev Reflection at the Dirac Point in a Graphene Quantum Hall State Coupled to a Superconductor
Abstract
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.
- Authors:
-
- 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)
- Publication Date:
- Research Org.:
- Pennsylvania State Univ., University Park, PA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1489113
- Alternate Identifier(s):
- OSTI ID: 1466437
- Grant/Contract Number:
- SC0005042; 2016YFA0401003
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review Letters
- Additional Journal Information:
- Journal Volume: 121; Journal Issue: 8; Journal ID: ISSN 0031-9007
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; graphene; Andreev effect; superconductivity; quantum Hall effect
Citation Formats
Sahu, Manas Ranjan, Liu, Xin, Paul, Arup Kumar, Das, Sourin, Raychaudhuri, Pratap, Jain, J. K., and Das, Anindya. Inter-Landau-level Andreev Reflection at the Dirac Point in a Graphene Quantum Hall State Coupled to a NbSe2 Superconductor. United States: N. p., 2018.
Web. doi:10.1103/PhysRevLett.121.086809.
Sahu, Manas Ranjan, Liu, Xin, Paul, Arup Kumar, Das, Sourin, Raychaudhuri, Pratap, Jain, J. K., & Das, Anindya. Inter-Landau-level Andreev Reflection at the Dirac Point in a Graphene Quantum Hall State Coupled to a NbSe2 Superconductor. United States. https://doi.org/10.1103/PhysRevLett.121.086809
Sahu, Manas Ranjan, Liu, Xin, Paul, Arup Kumar, Das, Sourin, Raychaudhuri, Pratap, Jain, J. K., and Das, Anindya. Fri .
"Inter-Landau-level Andreev Reflection at the Dirac Point in a Graphene Quantum Hall State Coupled to a NbSe2 Superconductor". United States. https://doi.org/10.1103/PhysRevLett.121.086809. https://www.osti.gov/servlets/purl/1489113.
@article{osti_1489113,
title = {Inter-Landau-level Andreev Reflection at the Dirac Point in a Graphene Quantum Hall State Coupled to a NbSe2 Superconductor},
author = {Sahu, Manas Ranjan and Liu, Xin and Paul, Arup Kumar and Das, Sourin and Raychaudhuri, Pratap and Jain, J. K. and Das, Anindya},
abstractNote = {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.},
doi = {10.1103/PhysRevLett.121.086809},
journal = {Physical Review Letters},
number = 8,
volume = 121,
place = {United States},
year = {Fri Aug 24 00:00:00 EDT 2018},
month = {Fri Aug 24 00:00:00 EDT 2018}
}
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