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Continuous and reversible tuning of the disorder-driven superconductor-insulator transition in bilayer grapheneopen access

Authors
Lee, Gil-HoJeong, DongchanPark, Kee-SuMeir, YigalCha, Min-ChulLee, Hu-Jong
Issue Date
Aug-2015
Publisher
NATURE PUBLISHING GROUP
Keywords
QUANTUM PHASE-TRANSITIONS; ELECTRIC-FIELD; 2-DIMENSIONAL SUPERCONDUCTORS; LOCALIZATION; STATE; FILMS
Citation
SCIENTIFIC REPORTS, v.5, pp.1 - 43
Indexed
SCIE
SCOPUS
Journal Title
SCIENTIFIC REPORTS
Volume
5
Start Page
1
End Page
43
URI
https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/17428
DOI
10.1038/srep13466
ISSN
2045-2322
Abstract
The influence of static disorder on a quantum phase transition (QPT) is a fundamental issue in condensed matter physics. As a prototypical example of a disorder-tuned QPT, the superconductor-insulator transition (SIT) has been investigated intensively over the past three decades, but as yet without a general consensus on its nature. A key element is good control of disorder. Here, we present an experimental study of the SIT based on precise in-situ tuning of disorder in dual-gated bilayer graphene proximity-coupled to two superconducting electrodes through electrical and reversible control of the band gap and the charge carrier density. In the presence of a static disorder potential, Andreev-paired carriers formed close to the Fermi level in bilayer graphene constitute a randomly distributed network of proximity-induced superconducting puddles. The landscape of the network was easily tuned by electrical gating to induce percolative clusters at the onset of superconductivity. This is evidenced by scaling behavior consistent with the classical percolation in transport measurements. At lower temperatures, the solely electrical tuning of the disorder-induced landscape enables us to observe, for the first time, a crossover from classical to quantum percolation in a single device, which elucidates how thermal dephasing engages in separating the two regimes.
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COLLEGE OF SCIENCE AND CONVERGENCE TECHNOLOGY > DEPARTMENT OF PHOTONICS AND NANOELECTRONICS > 1. Journal Articles

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COLLEGE OF SCIENCE AND CONVERGENCE TECHNOLOGY (DEPARTMENT OF PHOTONICS AND NANOELECTRONICS)
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