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Hot carrier relaxation in CdTe via phonon-plasmon modes.

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Techert,  S.
Research Group of Structural Dynamics of (Bio)Chemical Systems, MPI for biophysical chemistry, Max Planck Society;

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Citation

Zhong, Y., Ostach, D., Scholz, M., Epp, S. W., Techert, S., Schlichting, I., et al. (2017). Hot carrier relaxation in CdTe via phonon-plasmon modes. Journal of Physics: Condensed Matter, 29(9): 095701. doi:10.1088/1361-648X/aa5478.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002C-3DB9-C
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/cm2. At fluences below 1 mJ/cm2 the transient reflectivity is dominated by the dynamics of hybrid phonon-plasmon modes. At fluences above 1 mJ/cm2 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.