Dissipation-Driven Quantum Phase Transition in Superconductor-Graphene Systems
Abstract
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.
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.Attached Files
Published - LUTprl08.pdf
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Additional details
- Eprint ID
- 11576
- Resolver ID
- CaltechAUTHORS:LUTprl08
- Office of Naval Research (ONR)
- NSF
- Created
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2008-09-07Created from EPrint's datestamp field
- Updated
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2021-11-08Created from EPrint's last_modified field