High Tc superconductivity in strong electron-phonon interacting systems with frustrated charge order

ORAL

Abstract

In this talk, I will discuss how geometric frustration inhibits charge order and allows superconductivity to benefits from strong electron-phonon coupling. We perform sign-problem-free Quantum Monte Carlo simulation to study Holstein model with strong electron-phonon coupling on triangular and square lattices. Our simulation indicates that geometric frustration of charge density wave enables strong superconductivity to exist under much wider conditions in temperature and electron-phonon coupling strength. In particular, under geometric frustration a novel coexistence phase where superconducting coherence develops within a charge ordered state exists in a strong electron-phonon coupling regime.

–

Presenters

  • Zixiang Li

    Tsinghua University, University of California, Berkeley

Authors

  • Zixiang Li

    Tsinghua University, University of California, Berkeley

  • Marvin L Cohen

    Department of Physics, University of California at Berkeley, Physics, UC Berkeley, University of California, Berkeley

  • Dunghai Lee

    University of California, Berkeley