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Dissipation-Driven Quantum Phase Transition in Superconductor-Graphene Systems

Lutchyn, Roman M. and Galitski, Victor M. and Refael, Gil and Das Sarma, S. (2008) Dissipation-Driven Quantum Phase Transition in Superconductor-Graphene Systems. Physical Review Letters, 101 (10). Art. No. 106402. ISSN 0031-9007. doi:10.1103/PhysRevLett.101.106402.

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We show that a system of Josephson junctions coupled via low-resistance tunneling contacts to graphene substrate(s) may effectively operate as a current switching device. The effect is based on the dissipation-driven superconductor-to-insulator quantum phase transition, which happens due to the interplay of the Josephson effect and Coulomb blockade. Coupling to a graphene substrate with gapless excitations further enhances charge fluctuations favoring superconductivity. The effect is shown to scale exponentially with the Fermi energy in graphene, which can be controlled by the gate voltage. We develop a theory that quantitatively describes the quantum phase transition in a two-dimensional Josephson junction array, but it is expected to provide a reliable qualitative description for one-dimensional systems as well.

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Lutchyn, Roman M.0000-0002-0222-9728
Additional Information:© 2008 The American Physical Society. (Received 19 June 2008; published 2 September 2008) We thank M. Feigel’man, E. Hwang, J. Lau, and S. Tewari for stimulating discussions. V.G. acknowledges the hospitality of Boston University visitors program. This work was supported by U.S.-ONR and NSF-NRI.
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Office of Naval Research (ONR)UNSPECIFIED
Issue or Number:10
Record Number:CaltechAUTHORS:LUTprl08
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:11576
Deposited By: Archive Administrator
Deposited On:07 Sep 2008 08:00
Last Modified:08 Nov 2021 22:00

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