Time-domain pumping a quantum-critical charge-density-wave-ordered material

Abstract

We determine the exact time-resolved photoemission spectroscopy for a nesting driven charge-density-wave (described by the spinless Falicov-Kimball model within dynamical mean-field theory). The pump-probe experiment involves two light pulses: the first is an ultrashort intense pump pulse that excites the system into nonequilibrium, and the second is a lower amplitude higher frequency probe pulse that photoexcites electrons. We examine three different cases: the strongly correlated metal, the quantum-critical charge density wave and the critical Mott insulator. Our results show that the quantum critical charge density wave has an ultra efficient relaxation channel that allows electrons to be de-excited during the pump pulse, resulting in little net excitation. In contrast, the metal and the Mott insulator show excitations that are closer to what one expects from these systems. In addition, the pump field produces spectral band narrowing, peak sharpening, and a spectral gap reduction, all of which rapidly return to their field free values after the pump is over.

12 pages, 12 figures, typeset in ReVTeX

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Cited by in corpus (12)

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• Adiabatic Preparation of a Correlated Symmetry-Broken Initial State with the Generalized Kadanoff--Baym Ansatz
• Holography and thermalization in optical pump-probe spectroscopy
• Theoretical description of pump/probe experiments in electron mediated charge-density-wave insulators
• Nonthermal switching of charge order: dynamical slowing down and optimal control
• Nonequilibrium charge transport through Falicov-Kimball structures connected to metallic leads
• Real-time evolution of static electron-phonon models in time-dependent electric fields
• Interpreting pulse-shape effects in pump-probe spectroscopies
• Electronic transport through correlated electron systems with nonhomogeneous charge orderings
• Nonequilibrium dynamics of suppression, revival, and loss of charge order in a laser pumped electron-phonon system