Exciton Condensation in Electron-hole Doped Hubbard Bilayers -- A Sign-problem-free Quantum Monte Carlo Study

ORAL

Abstract

A long-sought state of matter, exciton condensation, recently has been realized experimentally in several systems. We develop a sign-problem-free Determinant Quantum Monte Carlo (DQMC) algorithm for bilayer Hubbard model with electron-hole doping, which is an ideal platform to study exciton condensation due to the suppression of electron-hole recombination. In square lattice systems, we demonstrate a tendency for exciton condensation at momentum (π, π), and this excitonic order appears to compete with a charge ordered state in the parameter regime we study. Exciton condensation on hexagonal lattices, presumably more pertinent to systems used in previous experimental realizations, has also been investigated and the results will be shown in comparison with square lattice results.

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Presenters

  • Xuxin Huang

    Stanford University

Authors

  • Xuxin Huang

    Stanford University

  • Martin Claassen

    Simons Foundation Flatiron Institute, Center for Computational Quantum Physics, The Flatiron Institute, Center for Computational Quantum Physics, Simons Foundation Flatiron Institute

  • Edwin Huang

    Stanford University, SLAC National Accelerator Laboratory

  • Brian Moritz

    Stanford University, Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, SLAC National Accelerator Laboratory, SLAC and Stanford University, Institute for Materials and Energy Science, Stanford, SSRL Materials Science Division, SLAC National Accelerator Laboratory and Stanford University

  • Thomas Devereaux

    Stanford University, Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, SLAC National Accelerator Laboratory, Physics, Stanford University, SLAC and Stanford University, Institute for Materials and Energy Science, Stanford, SIMES, SLAC National Accelerator Lab, SLAC National Accelerator Laboratory and Stanford University, Stanford Institute for Materials and Energy Sciences, SLAC, Stanford, SIMES, SLAC, and Stanford University, Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory and Stanford University