Mechanism for displacive excitation of coherent phonons in Sb, Bi, Te, and Ti2O3

Mechanism for displacive excitation of coherent phonons in Sb, Bi, Te, and Ti2O3

Coherent phonons in Sb, Bi, Te, and Ti2O3 can be generated impulsively, and detected in the time domain through reflectivity modulation using 60 fs pulses of laser light at 2 eV. Experimental data for these opaque solids suggest that a direct Raman excitation mechanism is not responsible for coheren...

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Veröffentlicht in:Applied physics letters 1991-10, Vol.59 (16), p.1923-1925
Hauptverfasser: CHENG, T. K, VIDAL, J, ZEIGER, H. J, DRESSELHAUS, G, DRESSELHAUS, M. S, IPPEN, E. P
Format: Artikel
Sprache:eng
Schlagworte:
Condensed matter: structure, mechanical and thermal properties
Exact sciences and technology
Lattice dynamics
Physics
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Zusammenfassung:Coherent phonons in Sb, Bi, Te, and Ti2O3 can be generated impulsively, and detected in the time domain through reflectivity modulation using 60 fs pulses of laser light at 2 eV. Experimental data for these opaque solids suggest that a direct Raman excitation mechanism is not responsible for coherent phonon generation. Rather, the excitation is attributed to an electronically induced displacement of the ion equilibrium coordinates.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.106187