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Energy dissipation from a correlated system driven out of equilibrium

  • Author(s): Rameau, JD
  • Freutel, S
  • Kemper, AF
  • Sentef, MA
  • Freericks, JK
  • Avigo, I
  • Ligges, M
  • Rettig, L
  • Yoshida, Y
  • Eisaki, H
  • Schneeloch, J
  • Zhong, RD
  • Xu, ZJ
  • Gu, GD
  • Johnson, PD
  • Bovensiepen, U
  • et al.

Published Web Location

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5187426/
No data is associated with this publication.
Abstract

In complex materials various interactions have important roles in determining electronic properties. Angle-resolved photoelectron spectroscopy (ARPES) is used to study these processes by resolving the complex single-particle self-energy and quantifying how quantum interactions modify bare electronic states. However, ambiguities in the measurement of the real part of the self-energy and an intrinsic inability to disentangle various contributions to the imaginary part of the self-energy can leave the implications of such measurements open to debate. Here we employ a combined theoretical and experimental treatment of femtosecond time-resolved ARPES (tr-ARPES) show how population dynamics measured using tr-ARPES can be used to separate electron-boson interactions from electron-electron interactions. We demonstrate a quantitative analysis of a well-defined electron-boson interaction in the unoccupied spectrum of the cuprate Bi 2 Sr 2 CaCu 2 O 8+x characterized by an excited population decay time that maps directly to a discrete component of the equilibrium self-energy not readily isolated by static ARPES experiments.

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