Superconductivity from energy fluctuations in dilute quantum critical polar metals

ORAL

Abstract

Superconductivity in low carrier density metals challenges the conventional electron-phonon theory due to the absence of retardation required to overcome Coulomb repulsion. Here we show that in dilute metals near polar quantum critical points the Coulomb repulsion can be surpassed by the attraction mediated by zero-point energy fluctuations of the critical polar mode. Our estimates show that this mechanism can explain the critical temperatures observed in doped SrTiO3, and we predict enhanced effects of polar quantum criticality on superconductivity in dilute two-dimensional metals.

*P.A.V. acknowledges the Postdoctoral Fellowship support from the Rutgers University Center for Materials Theory. This work was also supported by NSF grant DMR-1830707 (P. Coleman) and grant no. DE-SC0020353 (P. Chandra) funded by US Department of Energy, Office of Science.

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Presenters

  • Premala Chandra

    • Rutgers University
    • Dept. of Physics and Astronomy, Rutgers University, New Brunswick

Authors

  • Premala Chandra

    • Rutgers University
    • Dept. of Physics and Astronomy, Rutgers University, New Brunswick

  • Pavel Volkov

    • Rutgers University
    • Department of Physics and Astronomy, Center for Materials Theory,Rutgers University, Piscataway, New Jersey 08854, USA
    • Physics and Astronomy, Rutgers University

  • Piers Coleman

    • Rutgers University
    • Rutgers University, New Brunswick
    • Physics, Rutgers University