Understanding spin excitations in cuprates by combining RIXS and numerical simulation

ORAL

Abstract

The topic of spin excitations is central to the field of unconventional superconductivity. For the high-temperature cuprate superconductors, resonant inelastic X-ray scattering (RIXS) has emerged as a leading technique for probing spin excitations across much of the Brillouin zone. Here we present high-resolution RIXS spectra on two compounds, La2-xSrxCuO4 (LSCO) and (Bi,Pb)2(Sr,La)2CuO6+x (Bi2201), studying in detail the doping dependence of the spin excitations' dispersion, damping, and intensity in the underdoped region of LSCO and across the entire phase diagram of Bi2201. We show that the excitations' dispersion and redistribution of spectral weight upon doping are captured by the three-orbital Hubbard model, which we numerically simulate via determinantal quantum Monte Carlo. We further discuss the connection between charge transfer energy and compound-specific properties of spin excitations. The consistency between our model calculations and experimental data support a unified picture of spin excitations in the cuprates.

–

Presenters

  • Edwin Huang

    Stanford Univ, SLAC National Accelerator Laboratory, Physics, Stanford University, Stanford University

Authors

  • Edwin Huang

    Stanford Univ, SLAC National Accelerator Laboratory, Physics, Stanford University, Stanford University

  • Yingying Peng

    University of Illinois at Urbana-Champaign, Politecnico di Milano

  • Laura Chaix

    SLAC National Accelerator Laboratory, CEA, Centre de Saclay

  • Yao Wang

    Department of Applied Physics, Stanford University, Harvard Univ, Physics, Harvard University, Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory

  • Chunjing Jia

    Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, SLAC National Accelerator Laboratory, SIMIS, Stanford University, SLAC - Natl Accelerator Lab, Stanford University, Stanford Univ

  • Brian Moritz

    Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, SLAC - Natl Accelerator Lab, SLAC and Stanford University, SLAC National Accelerator Laboratory, Stanford Institute for Materials and Energy Sciences, SLAC National Laboratory, SIMIS, Stanford University, Physics, Stanford University, Stanford Univ, SIMES, SLAC and Stanford University

  • Thorsten Schmitt

    Paul Scherrer Institut, Swiss Light Source, PSI, Swiss Light Source, Paul Scherrer Institut, Swiss Light Source, Paul Scherrer Institute, Paul Scherrer Institute

  • Zhi-Xun Shen

    Stanford University, SLAC National Accelerator Laboratory, SLAC - Natl Accelerator Lab, Stanford Univ, SIMIS, Stanford University, Applied Physics, Stanford Univ, Stanford University and SLAC National Accelerator Laboratory, Applied Physics, Stanford University

  • Lucio Braicovich

    Politecnico di Milano

  • Giacomo Ghiringhelli

    Politecnico di Milano

  • Wei-Sheng Lee

    SLAC National Accelerator Laboratory, SLAC - Natl Accelerator Lab

  • Thomas Devereaux

    Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Stanford Univ, SLAC and Stanford University, SLAC National Accelerator Laboratory, SLAC - Natl Accelerator Lab, Stanford Institute for Materials and Energy Sciences, SLAC National Laboratory, Stanford University, SIMIS, Stanford University, Physics, Stanford University, SLAC National Lab and Stanford University, SIMES, SLAC and Stanford University