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.

Giannetti, C., Zgrablic, G., Consani, C., Crepaldi, A., Nardi, D., Ferrini, G., Dhalenne, G., Revcolevschi, A., Parmigiani, F., Disentangling thermal and nonthermal excited states in a charge-transfer insulator by time- and frequency-resolved pump-probe spectroscopy, <<PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS>>, 2009; 80 (Dicembre): N/A-N/A. [doi:10.1103/PhysRevB.80.235129] [http://hdl.handle.net/10807/7414]

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

Giannetti, Claudio;Zgrablic, Goran;Nardi, Damiano;Ferrini, Gabriele;Parmigiani, Fulvio
2009

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.
Inglese
http://prb.aps.org/abstract/PRB/v80/i23/e235129
Giannetti, C., Zgrablic, G., Consani, C., Crepaldi, A., Nardi, D., Ferrini, G., Dhalenne, G., Revcolevschi, A., Parmigiani, F., Disentangling thermal and nonthermal excited states in a charge-transfer insulator by time- and frequency-resolved pump-probe spectroscopy, <>, 2009; 80 (Dicembre): N/A-N/A. [doi:10.1103/PhysRevB.80.235129] [http://hdl.handle.net/10807/7414]
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/10807/7414
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