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Nematic superconductivity stabilized by density wave fluctuations: Possible application to twisted bilayer graphene

  • Author(s): Kozii, Vladyslav
  • Isobe, Hiroki
  • Venderbos, Jörn WF
  • Fu, Liang
  • et al.
Abstract

© 2019 American Physical Society. Nematic superconductors possess unconventional superconducting order parameters that spontaneously break rotational symmetry of the underlying crystal. In this work we propose a mechanism for nematic superconductivity stabilized by strong density wave fluctuations in two dimensions. While the weak-coupling theory finds the fully gapped chiral state to be energetically stable, we show that strong density wave fluctuations result in an additional contribution to the free energy of a superconductor with multicomponent order parameters, which generally favors nematic superconductivity. Our theory sheds light on the recent observation of rotational symmetry breaking in the superconducting state of twisted bilayer graphene.

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