Disentangling thermal and non-thermal excited states in a charge-transfer insulator by time-and-frequency resolved pump-probe spectroscopy

Abstract

Time-and-frequency resolved pump-probe optical spectroscopy is used to investigate the effect of the impulsive injection of delocalized excitations through a charge-transfer process in insulating CuGeO3. A large broadening of the charge-transfer edge is observed on the sub-ps timescale. The modification of this spectral feature can not be attributed to the local increase of the effective temperature, as a consequence of the energy absorbed by the pump pulse. The measured modifications of the optical properties of the system are consistent with the creation of a non-thermal state, metastable on the ps timescale, after the pump-induced impulsive modification of the electron interactions.

8 pages, 5 figures. Published on Physical Review B.

References in corpus (3)

• Nonthermal steady states after an interaction quench in the Falicov-Kimball model
• Time evolution of correlations in strongly interacting fermions after a quantum quench
• Theory of time-resolved optical spectroscopy on correlated electron systems

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