103 0

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

Title
Continuous and reversible tuning of the disorder-driven superconductor-insulator transition in bilayer graphene
Author
차민철
Keywords
QUANTUM PHASE-TRANSITIONS; ELECTRIC-FIELD; 2-DIMENSIONAL SUPERCONDUCTORS; LOCALIZATION; STATE; FILMS
Issue Date
2015-08
Publisher
NATURE PUBLISHING GROUP
Citation
SCIENTIFIC REPORTS, v. 5, Article ID. 13466
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.
URI
https://www.nature.com/articles/srep13466?proof\u003dtrue\u0026error\u003dcookies_not_supportedhttp://hdl.handle.net/20.500.11754/38086
ISSN
2045-2322
DOI
10.1038/srep13466
Appears in Collections:
COLLEGE OF SCIENCE AND CONVERGENCE TECHNOLOGY[E](과학기술융합대학) > PHOTONICS AND NANOELECTRONICS(나노광전자학과) > Articles
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE