Quantum Monte Carlo study of the cavity-coupled interacting electron gas

ORAL

Abstract

Using the auxiliary-field quantum Monte Carlo method, we study the interacting electron gas coupled to a cavity. While in the homogeneous case and the dipole approximation, the light-matter coupling in this model can still be solved analytically, we study the effect of a modulating external potential and - within an approximation - multiple photon modes carrying finite momentum. Our results inform ongoing efforts in developing improved functionals for the quantum electrodynamical density functional theory (QEDFT) and may shed light on the shortcomings of the dipole approximation in extended systems.

*DFG grant WE 7176/1-1

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Presenters

  • Lukas Weber

    • Center for Computational Quantum Physics, Flatiron institute

Authors

  • Lukas Weber

    • Center for Computational Quantum Physics, Flatiron institute

  • Miguel A Morales

    • Simons Foundation

  • Shiwei Zhang

    • Simons Foundation
    • Flatiron Institute

  • Angel Rubio

    • Max Planck Institute for the Structure & Dynamics of Matter
    • Max Planck Institute for the Structure and Dynamics of Matter
    • Max Planck Institute for the Structure &
    • Max Planck Institute for the Structure & Dynamics of Matter; Center for Computational Quantum Physics, Flatiron Institute
    • Center for Computational Quantum Physics, Flatiron Institute
    • Max Planck Institute for the Structure and Dynamics of Matter - Flatiron Institute
    • Max Planck Institute for Structure and Dynamics of Matter