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Ultrafast hole burning in intersubband absorption lines of GaN/AlN superlattices
Auteur(s)
Wang, Z.
Reimann, K.
Woerner, M.
Elsaesser, T.
Baumann, E.
Giorgetta, Fabrizio R.
Wu, H.
Schaff, W. J.
Eastman, L. F.
Date de parution
2006
In
Applied Physics Letters, American Institute of Physics (AIP), 2006/89/151103/1-3
Résumé
The authors present evidence for a distinct optical phonon progression in the nonlinear intersubband absorption spectra of electrons in a GaN/AlN superlattice. Femtosecond two-color pump-probe experiments in the near infrared show spectral holes separated by the longitudinal optical (LO) phonon frequency and a homogeneous line broadening of approximately 50 meV. The nonlinear bleaching signal decays with a time constant of 160 fs due to intersubband scattering of delocalized electrons, followed by a weak picosecond component attributed to the relaxation of electrons from longer-lived localized states.
Identifiants
Type de publication
journal article
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