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Controllable Andreev Bound States in Bilayer Graphene Josephson Junctions from Short to Long Junction Limits

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Title
Controllable Andreev Bound States in Bilayer Graphene Josephson Junctions from Short to Long Junction Limits
Author(s)
Park, Geon-Hyoung; Wonjun Lee; Park, Sein; Watanabe, Kenji; Taniguchi, Takashi; Gil Young Cho; Lee, Gil-Ho
Publication Date
2024-05
Journal
Physical Review Letters, v.132, no.22
Publisher
American Physical Society
Abstract
We demonstrate that the mode number of Andreev bound states in bilayer graphene Josephson junctions can be modulated by controlling the superconducting coherence length in situ. By exploiting the quadratic band dispersion of bilayer graphene, we control the Fermi velocity and thus the coherence length via the application of electrostatic gating. Tunneling spectroscopy of the Andreev bound states reveals a crossover from short to long Josephson junction regimes as we approach the charge neutral point of the bilayer graphene. Furthermore, analysis of different mode numbers of the Andreev energy spectrum allows us to estimate the phase-dependent Josephson current quantitatively. Our Letter provides a new way for studying multimode Andreev levels by tuning the Fermi velocity.
URI
https://pr.ibs.re.kr/handle/8788114/15276
DOI
10.1103/PhysRevLett.132.226301
ISSN
0031-9007
Appears in Collections:
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > 1. Journal Papers (저널논문)
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