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Charge- 4e Superconductivity from Multicomponent Nematic Pairing: Application to Twisted Bilayer Graphene

Fernandes, Rafael M ; Fu, Liang

Physical review letters, 2021-07, Vol.127 (4), p.1-047001 [Periódico revisado por pares]

College Park: American Physical Society

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  • Título:
    Charge- 4e Superconductivity from Multicomponent Nematic Pairing: Application to Twisted Bilayer Graphene
  • Autor: Fernandes, Rafael M ; Fu, Liang
  • Assuntos: Bilayers ; CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY ; Cooper pairs ; d-wave ; Fields (mathematics) ; Graphene ; Inhomogeneous systems ; Landau-Ginzburg theory ; Lattices ; Nematic order ; Order parameters ; Rotational states ; Superconductivity ; Superconductors ; Symmetry
  • É parte de: Physical review letters, 2021-07, Vol.127 (4), p.1-047001
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
    USDOE Office of Science (SC), Basic Energy Sciences (BES)
    SC0020045
  • Descrição: We show that unconventional nematic superconductors with multicomponent order parameter in lattices with three- and sixfold rotational symmetries support a charge- 4 e vestigial superconducting phase above Tc. The charge-4e state, which is a condensate of four-electron bound states that preserve the rotational symmetry of the lattice, is nearly degenerate with a competing vestigial nematic state, which is nonsuperconducting and breaks the rotational symmetry. This robust result is the consequence of a hidden discrete symmetry in the Ginzburg-Landau theory, which permutes quantities in the gauge sector and in the crystalline sector of the symmetry group. We argue that random strain generally favors the charge-4e state over the nematic phase, as it acts as a random mass to the former but as a random field to the latter. Thus, we propose that two-dimensional inhomogeneous systems displaying nematic superconductivity, such as twisted bilayer graphene, provide a promising platform to realize the elusive charge-4e superconducting phase.
  • Editor: College Park: American Physical Society
  • Idioma: Inglês
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