Effect of Electron-Phonon Interactions on Dirac Fermions

ORAL

Abstract

The effect of electron-electron interactions on Dirac fermions, and the possibility of an intervening spin liquid phase between the semi-metal and antiferromagnetic (AF) regimes, has been a focus of intense quantum simulation effort over the last five years. We use determinant quantum Monte Carlo (DQMC) to study the Holstein model on Honeycomb lattice and pi-flux lattice and explore the role of electron-phonon interactions on Dirac fermions. We show that they give rise to charge density wave (CDW) order, and present evidence that this occurs only above a finite critical interaction strength. We evaluate the temperature for the transition into the CDW which, unlike the AF transition, can occur at finite values owing to the discrete nature of the broken symmetry.

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Presenters

  • Yuxi Zhang

    Department of Physics, University of California, Davis

Authors

  • Yuxi Zhang

    Department of Physics, University of California, Davis

  • George Batrouni

    Institut de Physique de Nice, Universite de Nice-Sophia Antipolis

  • Wei-ting Chiu

    Department of Physics, University of California, Davis, Physics Department, University of California, Davis

  • Natanael de Carvalho Costa

    Instituto de Física, Universidade Federal do Rio de Janeiro, Universidade Federal do Rio de Janeiro

  • Huaiming Guo

    Department of Physics, Beihang University

  • Richard Theodore Scalettar

    University of California, Davis, Univ of California - Davis, Department of Physics, University of California, Davis