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Quantum Monte Carlo calculations of dynamic spin excitations in FeSe

ORAL

Abstract

The rich physics of bulk and monolayer FeSe has been widely studied in the condensed matter physics community. The pairing mechanism giving rise to the enhanced superconductivity of the monolayer is mainly attributed to spin fluctuations. Here we discuss unbiased dynamical cluster approximation (DCA) quantum Monte Carlo calculations to understand the physics of these compounds. Specifically, we calculate the dynamic spin susceptibility of a two-orbital Hubbard model with parameters tuned to describe both bulk and monolayer FeSe and use the maximum entropy method to perform the analytic continuation to real frequencies. We compare the DCA results with neutron scattering data for bulk FeSe as well as resonant inelastic x-ray spectroscopy (RIXS) data for the monolayer compound.

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Presenters

  • Seher Karakuzu

    Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6164, USA

Authors

  • Seher Karakuzu

    Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6164, USA

  • Jonathan Pelliciari

    NSLS-II, Brookhaven National Laboratory, Upton, NY, 11973, USA and Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA

  • Riccardo Comin

    Massachusetts Institute of Technology MIT, Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA, Massachusetts Institute of Technology, Department of Physics, Massachusetts Institute of Technology, Physics, MIT

  • Steven Johnston

    Department of Physics and Astronomy, University of Tennessee knoxville, University of Tennessee, Knoxville, University of Tennessee in Knoxville, Department of Physics and Astronomy, The University of Tennessee, Knoxville, Tennessee 37996, USA and Joint Institute of Advanced Materials at The University of Tennessee, Kn

  • Thomas Maier

    Computational Sciences and Engineering Division and Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge National Laboratory, Oak Ridge National Lab, Center for Nanophase Materials Sciences,Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6164, USA and Computational Sciences and Engineering Division, Oak Ridge Nat, Computational Sciences and Engineering Division, Oak Ridge National Laboratory