Chiral superconductivity from repulsive interactions in doped graphene
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Levitov_Chiral superconductivity.pdf
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Author(s)
Chubukov, Andrey V.
Nandkishore, Rahul Mahajan
Levitov, Leonid
Date Issued
January 2012
Journal
Nature Physics
Citation
Nandkishore, Rahul, L. S. Levitov, and A. V. Chubukov. Chiral Superconductivity from Repulsive Interactions in Doped Graphene. Nature Physics 8, no. 2 (January 22, 2012): 158-163.
Version
Original manuscript
Abstract
Chiral superconductivity, which breaks time-reversal symmetry, can exhibit a wealth of fascinating properties that are highly sought after for nanoscience applications. We identify doped graphene monolayer as a system where chiral superconductivity can be realized. In this material, a unique situation arises at a doping where the Fermi surface is nested and the density of states is singular. In this regime, d-wave superconductivity can emerge from repulsive electron–electron interactions. Using a renormalization group method, we argue that superconductivity dominates over all competing orders for generic weak repulsive interactions. Superconductivity develops simultaneously in two degenerate d-wave pairing channels. We argue that the resulting superconducting state is of chiral type, with the phase of the superconducting order parameter winding by 4π around the Fermi surface. Realization of this state in doped graphene will prove that superconductivity can emerge from electron–electron repulsion, and will open the door to applications of chiral superconductivity.
Description
Author Manuscript 17 Sep 2011
MIT Department
Massachusetts Institute of Technology. Department of Physics
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1038/nphys2208
