Tunneling spectroscopy of graphene nanodevices coupled to large-gap superconductors
Name
PhysRevB.98.121411.pdf
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1.77 MB
Format
Adobe PDF
Checksum (MD5)
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Author(s)
Pisoni, Riccardo
Watanabe, Kenji
Taniguchi, Takashi
Wang, I-Jan
Bretheau, Landry
Rodan Legrain, Daniel
Jarillo-Herrero, Pablo
Date Issued
September 2018
Journal
Physical Review B
Publisher
American Physical Society
Citation
Wang, Joel I-Jan et al. "Tunneling spectroscopy of graphene nanodevices coupled to large-gap superconductors." Physical Review B 98, 12 (September 2018): 121411(R) © 2018 American Physical Society
Version
Final published version
Abstract
We performed tunneling spectroscopy measurements of graphene coupled to niobium/niobium-nitride superconducting electrodes. Due to the proximity effect, the graphene density of states depends on the phase difference between the superconductors and exhibits a hard induced gap at zero phase, consistent with a continuum of Andreev bound states. At energies larger than the superconducting gap, we observed phase-dependent energy levels displaying the Coulomb blockade effect, which are interpreted as arising from spurious quantum dots, presumably embedded in the heterostructures and coupled to the proximitized graphene.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1103/PhysRevB.98.121411
