Sublattice modulated superconductivity in the kagome Hubbard model

Tilman Schwemmer; Hendrik Hohmann; Matteo Dürrnagel; Janik Potten; Jacob Beyer; Stephan Rachel; Yi-Ming Wu; Srinivas Raghu; Tobias Müller; Werner Hanke; Ronny Thomale

doi:10.1103/PhysRevB.110.024501

Sublattice modulated superconductivity in the kagome Hubbard model

Tilman Schwemmer, Hendrik Hohmann, Matteo Dürrnagel, Janik Potten, Jacob Beyer, Stephan Rachel, Yi-Ming Wu, Srinivas Raghu, Tobias Müller, Werner Hanke, Ronny Thomale

DOI 10.1103/PhysRevB.110.024501 · Physical Review B

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Abstract

We identify a superconducting order featuring spatial pair modulations on the kagome lattice subject to on-site Hubbard U and nearest-neighbor V interactions. Within our functional renormalization group analysis, this state appears with a concomitant d-wave superconducting (SC) instability at zero lattice momentum, where it distinguishes itself through intra-unit-cell modulations of the pairing function thus breaking the discrete space group symmetry. The relative weight of the sublattice modulated superconductor (SMS) and d-wave SC is influenced by the absolute interaction strength and coupling ratio V/U. Parametrically adjacent to this domain at weak coupling, we find an intra-unit-cell modulated vestigial charge density wave and an s-wave SC instability. Our study provides a microscopic setting and thorough description of this novel SMS arising within a translation symmetry broken background.