Effects of longer-range interactions on unconventional superconductivity

ORAL

Abstract

We analyze the effect of the non-vanishing range of electron-electron repulsion on the mechanism of unconventional superconductivity. We present asymptotically exact weak-coupling results for dilute electrons in the continuum and for the 2D extended Hubbard model, as well as density-matrix renormalization group results for the two-leg extended Hubbard model at intermediate couplings, and approximate results for the case of realistically screened Coulomb interactions. We show that $T_c$ is generally suppressed in some pairing channels as longer range interactions increase in strength, but superconductivity is not destroyed. Our results confirm that electron-electron interaction can lead to unconventional superconductivity under physically realistic circumstances.

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Authors

  • Srinivas Raghu

    Stanford University, Department of Physics, Stanford University, Stanford, CA, 94305

  • Erez Berg

    Department of Physics, Harvard University, Cambridge, MA 02138, USA, Department of Physics, Harvard University, Harvard University, Harvard

  • Andrey Chubukov

    University of Wisconsin, University of Wisconsin-Madison, University of Wisconsin, Madison, Dept. of Physics, University of Wisconsin-Madison

  • Steven Kivelson

    Stanford University