Inducing superconducting correlation in quantum Hall edge states

The quantum Hall (QH) effect supports a set of chiral edge states at the boundary of a two-dimensional system. A superconductor (SC) contacting these states can provide correlations of the quasiparticles in the dissipationless edge states. Here we fabricated highly transparent and nanometre-scale SC...

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Bibliographic Details
Published in:Nature physics 2017-07, Vol.13 (7), p.693-698
Main Authors: Lee, Gil-Ho, Huang, Ko-Fan, Efetov, Dmitri K., Wei, Di S., Hart, Sean, Taniguchi, Takashi, Watanabe, Kenji, Yacoby, Amir, Kim, Philip
Format: Article
Language:English
Subjects:
639/766/119/1003
639/766/119/2794
639/766/119/995
Atomic
Chemical potential
Classical and Continuum Physics
Coherence length
Complex Systems
Condensed Matter Physics
Conversion
Correlation
Correlation analysis
Dissipation
Electrodes
Graphene
Hybrid systems
Mathematical and Computational Physics
Molecular
Optical and Plasma Physics
Physics
Quantum physics
Superconductivity
Theoretical
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Summary:The quantum Hall (QH) effect supports a set of chiral edge states at the boundary of a two-dimensional system. A superconductor (SC) contacting these states can provide correlations of the quasiparticles in the dissipationless edge states. Here we fabricated highly transparent and nanometre-scale SC junctions to graphene. We demonstrate that the QH edge states can couple via superconducting correlations through the SC electrode narrower than the superconducting coherence length. We observe that the chemical potential of the edge state exhibits a sign reversal across the SC electrode. This provides direct evidence of conversion of the incoming electron to the outgoing hole along the chiral edge state, termed crossed Andreev conversion (CAC). We show that CAC can successfully describe the temperature, bias and SC electrode width dependences. This hybrid SC/QH system could provide a novel route to create isolated non-Abelian anyonic zero modes, in resonance with the chiral edge states. A superconductor–graphene junction is shown to exhibit the quantum Hall effect, with the chemical potential of the edge state displaying a sign reversal. Such a system could provide a platform for observing isolated non-Abelian anyonic zero modes.
ISSN:1745-2473
1745-2481
DOI:10.1038/nphys4084