Competing many-body instabilities and unconventional superconductivity in graphene

Maximilian L. Kiesel, Christian Platt, Werner Hanke, Dmitry A. Abanin, Ronny Thomale

Research output: Contribution to journalArticlepeer-review

226 Scopus citations

Abstract

The band structure of graphene exhibits van Hove singularities (VHSs) at dopings x=±1/8 away from the Dirac point. Near the VHS, interactions effects, enhanced due to the large density of states, can give rise to various many-body phases. We study the competition between many-body instabilities in graphene using the functional renormalization group. We predict a rich phase diagram, which, depending on band structure as well as the range and scale of Coulomb interactions, contains a d+id-wave superconducting (SC) phase, or a spin-density-wave phase at the VHS. The d+id state is expected to exhibit quantized charge and spin Hall response, as well as Majorana modes bound to vortices. Nearby the VHS, we find singlet d+id-wave and triplet f-wave SC phases.

Original languageEnglish (US)
Article number020507
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume86
Issue number2
DOIs
StatePublished - Jul 30 2012
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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