Quantum dynamics of the Hubbard-Holstein model in equilibrium and nonequilibrium: Application to pump-probe phenomena

G. De Filippis, V. Cataudella, E. A. Nowadnick, T. P. Devereaux, A. S. Mishchenko, N. Nagaosa

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Abstract

The spectral response and physical features of the 2D Hubbard-Holstein model are calculated both in equilibrium at zero and low chemical dopings, and after an ultrashort powerful light pulse, in undoped systems. At equilibrium and at strong charge-lattice couplings, the optical conductivity reveals a three-peak structure in agreement with experimental observations. After an ultrashort pulse and at nonzero electron-phonon interaction, phonon and spin subsystems oscillate with the phonon period T ph80fs. The decay time of the phonon oscillations is about 150-200fs, similar to the relaxation time of the charge system. We propose a criterion for observing these oscillations in high T c compounds: the time span of the pump light pulse τ pump has to be shorter than the phonon oscillation period T ph.

Original languageEnglish (US)
Article number176402
JournalPhysical Review Letters
Volume109
Issue number17
DOIs
StatePublished - Oct 23 2012
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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