Measuring correlated electron dynamics with time-resolved photoemission spectroscopy

Abstract

Time-resolved photoemission experiments can reveal fascinating quantum dynamics of correlated electrons. However, the thermalization of the electronic system is typically so fast that very short probe pulses are necessary to resolve the time evolution of the quantum state, and this leads to poor energy resolution due to the energy-time uncertainty relation. Although the photoemission intensity can be calculated from the nonequilibrium electronic Green functions, the converse procedure is therefore difficult. We analyze a hypothetical time-resolved photoemission experiment on a correlated electronic system, described by the Falicov-Kimball model in dynamical mean-field theory, which relaxes between metallic and insulating phases. We find that the real-time Green function which describes the transient behavior during the buildup of the metallic state cannot be determined directly from the photoemission signal. On the other hand, the characteristic collapse-and-revival oscillations of an excited Mott insulator can be observed as oscillating weight in the center of the Mott gap in the time-dependent photoemission spectrum.

12 pages, 5 figures

References in corpus (8)

• Collapse and Revival of the Matter Wave Field of a Bose-Einstein Condensate
• Exact solution of the Falicov-Kimball model with dynamical mean-field theory
• Nonequilibrium dynamical mean-field theory
• Nonthermal steady states after an interaction quench in the Falicov-Kimball model
• Ultrafast optical nonlinearity in quasi-one-dimensional Mott-insulator $\mathrm{S}{\mathrm{r}}_2\mathrm{Cu}{\mathrm{O}}_3$
• Quenching Bloch oscillations in a strongly correlated material
• Theory of time-resolved optical spectroscopy on correlated electron systems
• Initial correlations in nonequilibrium Falicov-Kimball model

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