Competition between superconductivity and charge density wave order in the Holstein model

ORAL

Abstract

A common theme in the study of superconductivity in strongly correlated materials is the competition between superconductivity (SC) and a charge density wave (CDW). While superconductivity in these materials may involve more exotic pairing mechanisms such as spin fluctuations, the basic electron-phonon problem remains of broad interest in the study of superconductivity, exhibits both SC and CDW phases, and has no exact analytic solution. This motivates our study of SC/CDW competition in the 2D Holstein model using numerically exact determinant quantum Monte Carlo. We describe the optimal conditions for superconductivity, the transition from the weak-coupling Migdal-Eliashberg regime to the strong-coupling polaronic regime, and the behavior of the charge density wave ordering wave vector as a function of the dimensionless electron-phonon coupling strength and the adiabatic ratio of the phonon frequency to the Fermi energy.

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Presenters

  • Benjamin Nosarzewski

    Stanford Univ, Physics, Stanford University

Authors

  • Benjamin Nosarzewski

    Stanford Univ, Physics, Stanford University

  • Edwin Huang

    Stanford Univ, SLAC National Accelerator Laboratory, Physics, Stanford University, Stanford University

  • Ilya Esterlis

    Stanford Univ, Physics, Stanford University

  • Phillip Dee

    Univ of Tennessee

  • Brian Moritz

    Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, SLAC - Natl Accelerator Lab, SLAC and Stanford University, SLAC National Accelerator Laboratory, Stanford Institute for Materials and Energy Sciences, SLAC National Laboratory, SIMIS, Stanford University, Physics, Stanford University, Stanford Univ, SIMES, SLAC and Stanford University

  • Steven Johnston

    Univ. of Tennessee, Univ of Tennessee, Physics, Univ of Tennessee, Knoxville, Physics and Astronomy, University of Tennessee, Department of Physics and Astronomy, University of Tennessee, Physics, Univ. of Tennessee, physics and astronomy, University of Tennessee, Department of Physics and Astronomy, Univ of Tennessee, Knoxville

  • Steven Kivelson

    Stanford University, Stanford Univ, Physics, Stanford University

  • Thomas Devereaux

    Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Stanford Univ, SLAC and Stanford University, SLAC National Accelerator Laboratory, SLAC - Natl Accelerator Lab, Stanford Institute for Materials and Energy Sciences, SLAC National Laboratory, Stanford University, SIMIS, Stanford University, Physics, Stanford University, SLAC National Lab and Stanford University, SIMES, SLAC and Stanford University