Hot carrier relaxation in CdTe via phonon-plasmon modes

• Verfasst von: Zhong, Yinpeng [VerfasserIn]
• Verfasst von: Schlichting, Ilme [VerfasserIn]
• Titel: Hot carrier relaxation in CdTe via phonon-plasmon modes
• Verf.angabe: Y. Zhong, D. Ostach, M. Scholz, S.W. Epp, S. Techert, I. Schlichting, J. Ullrich, F.S. Krasniqi
• Fussnoten: Gesehen am 12.09.2018
• Titel Quelle: Enthalten in: Journal of physics / Condensed matter
• Jahr Quelle: 2017
• Band/Heft Quelle: 29(2017,9) Artikel-Nummer 095701, ? Seiten
• ISSN Quelle: 1361-648X
• DOI: doi:10.1088/1361-648X/aa5478
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1580890970

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 −2 the transient reflectivity is dominated by the dynamics of hybrid phonon-plasmon modes. At fluences above 1 mJ cm −2 the 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.