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Title: Time-resolved resonant inelastic x-ray scattering in a pumped Mott insulator

Abstract

Collective excitations contain rich information about photoinduced transient states in correlated systems. In a Mott insulator, charge degrees of freedom are frozen, but can be activated by photodoping. The energy-momentum distribution of the charge excitation spectrum reflects the propagation of charge degrees of freedom and provides information about the interplay among various intertwined instabilities on the timescale set by the pump. To reveal charge excitations out of equilibrium, here we simulate time-resolved x-ray absorption and resonant inelastic x-ray scattering using a Hubbard model. After pumping, the former resolves photodoping, while the latter characterizes the formation, dispersion, weight, and nonlinear effects of collective excitations. Intermediate-state information from time-resolved resonant inelastic x-ray scattering (trRIXS) can be used to decipher the origin of these excitations, including bimagnons, Mott-gap excitations, doublon and single-electron in-gap states, and anti-Stokes relaxation during an ultrafast pump. This paper provides a theoretical foundation for existing and future trRIXS experiments.

Authors:
ORCiD logo [1];  [2];  [3];  [4];  [5]
  1. Harvard Univ., Cambridge, MA (United States)
  2. Stanford Univ., CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES)
  3. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES)
  4. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES); Univ. of North Dakota, Grand Forks, ND (United States)
  5. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES); Stanford Univ., CA (United States)
Publication Date:
Research Org.:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
OSTI Identifier:
1633441
Alternate Identifier(s):
OSTI ID: 1615555
Grant/Contract Number:  
AC02-76SF00515; AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review. B
Additional Journal Information:
Journal Volume: 101; Journal Issue: 16; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Ultrafast phenomena; Mott insulators; Strongly correlated systems; Resonant inelastic x-ray scattering; Time-resolved light scattering spectroscopy; Ultrafast pump-probe spectroscopy; X-ray absorption spectroscopy

Citation Formats

Wang, Yao, Chen, Yuan, Jia, Chunjing, Moritz, Brian, and Devereaux, Thomas P. Time-resolved resonant inelastic x-ray scattering in a pumped Mott insulator. United States: N. p., 2020. Web. doi:10.1103/physrevb.101.165126.
Wang, Yao, Chen, Yuan, Jia, Chunjing, Moritz, Brian, & Devereaux, Thomas P. Time-resolved resonant inelastic x-ray scattering in a pumped Mott insulator. United States. https://doi.org/10.1103/physrevb.101.165126
Wang, Yao, Chen, Yuan, Jia, Chunjing, Moritz, Brian, and Devereaux, Thomas P. Tue . "Time-resolved resonant inelastic x-ray scattering in a pumped Mott insulator". United States. https://doi.org/10.1103/physrevb.101.165126. https://www.osti.gov/servlets/purl/1633441.
@article{osti_1633441,
title = {Time-resolved resonant inelastic x-ray scattering in a pumped Mott insulator},
author = {Wang, Yao and Chen, Yuan and Jia, Chunjing and Moritz, Brian and Devereaux, Thomas P.},
abstractNote = {Collective excitations contain rich information about photoinduced transient states in correlated systems. In a Mott insulator, charge degrees of freedom are frozen, but can be activated by photodoping. The energy-momentum distribution of the charge excitation spectrum reflects the propagation of charge degrees of freedom and provides information about the interplay among various intertwined instabilities on the timescale set by the pump. To reveal charge excitations out of equilibrium, here we simulate time-resolved x-ray absorption and resonant inelastic x-ray scattering using a Hubbard model. After pumping, the former resolves photodoping, while the latter characterizes the formation, dispersion, weight, and nonlinear effects of collective excitations. Intermediate-state information from time-resolved resonant inelastic x-ray scattering (trRIXS) can be used to decipher the origin of these excitations, including bimagnons, Mott-gap excitations, doublon and single-electron in-gap states, and anti-Stokes relaxation during an ultrafast pump. This paper provides a theoretical foundation for existing and future trRIXS experiments.},
doi = {10.1103/physrevb.101.165126},
journal = {Physical Review. B},
number = 16,
volume = 101,
place = {United States},
year = {Tue Apr 21 00:00:00 EDT 2020},
month = {Tue Apr 21 00:00:00 EDT 2020}
}

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