Chiral superconductivity from repulsive interactions in doped graphene

Rahul Nandkishore, L. S. Levitov, A. V. Chubukov

Research output: Contribution to journalArticlepeer-review

369 Scopus citations

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 4′ 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.

Original languageEnglish (US)
Pages (from-to)158-163
Number of pages6
JournalNature Physics
Volume8
Issue number2
DOIs
StatePublished - Feb 2012

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