Calculations of the A_1 phonon frequency in photoexcited Tellurium

Abstract

Calculations of the A_1 phonon frequency in photoexcited tellurium are presented. The phonon frequency as a function of photoexcited carrier density and phonon amplitude is determined. Recent pump probe experiments are interpreted in the light of these calculatons. It is proposed that, in conjunction with measurements of the phonon period in ultra-fast pump-probe reflectivity experiments, the calculated frequency shifts can be used to infer the evolution of the density of photoexcited carriers on a sub-picosecond time-scale.

15 pages Latex, 3 postscript figures

References in corpus (1)

• Phonon softening and superconductivity in tellurium under pressure

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• A Microscopic Description of Displacive Coherent Phonons
• Ultrafast polarization switching in BaTiO${}_3$ by photoactivation of its ferroelectric and central modes
• Theory of ultrafast magnetization of non-magnetic semiconductors with localized conduction bands
• Light-induced renormalization of the band structure of chiral tellurium
• Lattice dynamics of photoexcited insulators from constrained density-functional perturbation theory