Large-k exciton dynamics in GaN epilayers: Nonthermal and thermal regimes (Articolo in rivista)

Type
Label
  • Large-k exciton dynamics in GaN epilayers: Nonthermal and thermal regimes (Articolo in rivista) (literal)
Anno
  • 2013-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1103/PhysRevB.87.075202 (literal)
Alternative label
  • Anna Vinattieri, Franco Bogani, Lucia Cavigli, Donatella Manzi, Massimo Gurioli, Eric Feltin, Jean-François Carlin, Denis Martin, Raphaël Butté, and Nicolas Grandjean (2013)
    Large-k exciton dynamics in GaN epilayers: Nonthermal and thermal regimes
    in Physical review. B, Condensed matter and materials physics
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Anna Vinattieri, Franco Bogani, Lucia Cavigli, Donatella Manzi, Massimo Gurioli, Eric Feltin, Jean-François Carlin, Denis Martin, Raphaël Butté, and Nicolas Grandjean (literal)
Pagina inizio
  • 075202 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 87 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
  • Google Scholar (literal)
  • Scopu (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Dipartimento di Fisica e Astronomia, LENS, CNISM, Università di Firenze, Italy Dipartimento di Energetica, Università di Firenze, Italy Institute of Condensed Matter Physics, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland Ifac-CNR (literal)
Titolo
  • Large-k exciton dynamics in GaN epilayers: Nonthermal and thermal regimes (literal)
Abstract
  • We present a detailed investigation performed at low temperature (T < 50 K) concerning the exciton dynamics in GaN epilayers grown on c-plane sapphire substrates, focusing on the exciton formation and the transition from the nonthermal to the thermal regime. The time-resolved kinetics of longitudinal-optical-phonon replicas is used to address the energy relaxation in the excitonic band. From picosecond time-resolved spectra, we bring evidence for a long lasting nonthermal excitonic distribution, which accounts for the first 50 ps. Such a behavior is confirmed in different experimental conditions when both nonresonant and resonant excitations are used. At low excitation power density, the exciton formation and their subsequent thermalization are dominated by impurity scattering rather than by acoustic phonon scattering. The estimate of the average energy of the excitons as a function of delay after the excitation pulse provides information on the relaxation time, which describes the evolution of the exciton population to the thermal regime. (literal)
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