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

Claudio Giannetti, Gabriele Ferrini, Goran Zgrablic, Damiano Nardi, Fulvio Parmigiani, Cristina Consani, Alberto Crepaldi, Guy Dhalenne, A. Revcolevschi

Risultato della ricerca: Contributo in rivistaArticolo in rivistapeer review

16 Citazioni (Scopus)

Abstract

Time- and frequency-resolved pump-probe optical spectroscopy is used to investigate the effects 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 time scale. The modification of this spectral feature cannot be attributed to the local increase in 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 nonthermal state, metastable on the picosecond time scale, after the pump-induced impulsive modification of the electron interactions.
Lingua originaleEnglish
pagine (da-a)N/A-N/A
Numero di pagine235129
RivistaPHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS
Volume80
DOI
Stato di pubblicazionePubblicato - 2009

Keywords

  • charge transfer insulator
  • non-thermal state
  • time-resolved optical spectroscopy

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