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Proceedings Paper

Theoretical description of pump/probe experiments in nesting induced charge density wave insulators
Author(s): J. K. Freericks; O. P. Matveev; A. M. Shvaika; T. P. Devereaux
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Paper Abstract

We present a theoretical description of time-resolved photoemission in charge-density-wave insulators that derive their ordering from electron nesting effects. In these pump/probe experiments, a large amplitude (but short duration) pump pulse excites the system into nonequilibrium and then a higher frequency low amplitude probe pulse photoexcites electrons, which are measured at the detector. We describe effects of electron correlations on the photoelectron spectroscopy and provide details for the theoretical techniques used to solve these problems. We also show how the gap fills in as the system is excited, even though the order parameter does not go to zero. The theory is developed for the Falicov-Kimball model, which can be solved exactly with nonequilibrium dynamical mean-field theory.

Paper Details

Date Published: 13 May 2016
PDF: 7 pages
Proc. SPIE 9835, Ultrafast Bandgap Photonics, 98351F (13 May 2016); doi: 10.1117/12.2223335
Show Author Affiliations
J. K. Freericks, Georgetown Univ. (United States)
O. P. Matveev, Georgetown Univ. (United States)
Institute for Condensed Matter Physics of National Academy of Sciences of Ukraine (Ukraine)
A. M. Shvaika, Institute for Condensed Matter Physics of National Academy of Sciences of Ukraine (Ukraine)
T. P. Devereaux, Geballe Lab. for Advanced Materials (United States)
SLAC National Accelerator Lab. (United States)

Published in SPIE Proceedings Vol. 9835:
Ultrafast Bandgap Photonics
Michael K. Rafailov; Eric Mazur, Editor(s)

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