title: Hot carrier relaxation in CdTe via phonon-plasmon modes.
abstract: Carrier and lattice dynamics of laser excited CdTe was studied by time-resolved reflectivity for excitation fluences spanning about three orders of magnitude, from 0.064 to 6.14 mJ cm-2. At fluences below 1 mJ cm-2the transient reflectivity is dominated by the dynamics of hybrid phonon-plasmon modes. At fluences above 1 mJ cm-2the time-dependent reflectivity curves show a complex interplay between band-gap renormalization, band filling, carrier dynamics and recombination. A framework that accounts for such complex dynamics is presented and used to model the time-dependent reflectivity data. This model suggests that the excess energy of the laser-excited hot carriers is reduced much more efficiently by emitting hybrid phonon-plasmon modes rather than bare longitudinal optical phonons.
authors.affiliation: Max Planck Advanced Study Group at CFEL/DESY, Notkestr. 85, 22607 Hamburg, Germany. Max-Planck-Institut für medizinische Forschung, Jahnstr. 29, 69120 Heidelberg, Germany. Max-Planck-Institut für Struktur und Dynamik der Matterie, Geb. 99 (CFEL), Luruper Chaussee 149, 22761 Hamburg, Germany.
authors.forename: Y
authors.initials: Y
authors.lastname: Zhong
authors.forename: D
authors.initials: D
authors.lastname: Ostach
authors.forename: M
authors.initials: M
authors.lastname: Scholz
authors.forename: S W
authors.initials: SW
authors.lastname: Epp
authors.forename: S
authors.initials: S
authors.lastname: Techert
authors.forename: I
authors.initials: I
authors.lastname: Schlichting
authors.forename: J
authors.initials: J
authors.lastname: Ullrich
authors.forename: F S
authors.initials: FS
authors.lastname: Krasniqi