Hot carrier relaxation in CdTe via phonon–plasmon modes

Zhong, Yin Peng; Ostach, D.; Scholz, M.; Epp, Sascha; Techert, S.; Schlichting, I; Ullrich, J.; Krasniqi, F. S.

doi:10.1088/1361-648X/aa5478

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Hot carrier relaxation in CdTe via phonon–plasmon modes

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Zhong, Yin Peng
Miller Group, Atomically Resolved Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Max Planck Advanced Study Group at CFEL/DESY;
Max-Planck-Institut für medizinische Forschung;

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Epp, Sascha
Miller Group, Atomically Resolved Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Max Planck Advanced Study Group at CFEL/DESY;
Max-Planck-Institut für Kernphysik;

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https://dx.doi.org/10.1088/1361-648X/aa5478
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引用

Zhong, Y. P., Ostach, D., Scholz, M., Epp, S., Techert, S., Schlichting, I., Ullrich, J., & Krasniqi, F. S. (2017). Hot carrier relaxation in CdTe via phonon–plasmon modes. Journal of Physics: Condensed Matter, 29(9):. doi:10.1088/1361-648X/aa5478.

引用: https://hdl.handle.net/11858/00-001M-0000-002D-7632-4

要旨

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.