Generation mechanism for coherent LO phonons in surface-space-charge fields of III-V-compounds | Zendy

Τ. Pfeifer | Zendy; T. Dekorsy | Zendy; W. K�tt | Zendy; H. Kurz | Zendy

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Generation mechanism for coherent LO phonons in surface-space-charge fields of III-V-compounds

Author(s) -

Τ. Pfeifer,

T. Dekorsy,

W. K�tt,

H. Kurz

Publication year - 1992

Publication title -

applied physics a solids and surface

Language(s) - English

Resource type - Journals

ISSN - 0721-7250

DOI - 10.1007/bf00348337

Subject(s) - phonon , ultrashort pulse , surface phonon , space charge , depolarization , laser , lattice (music) , lattice vibration , materials science , free space , charge carrier , physics , condensed matter physics , vibration , optics , atomic physics , quantum mechanics , medicine , endocrinology , acoustics , electron

We report on details of coherent LO phonon generation in surface-space-charge regions of III-V-compounds by optical injection of free carriers with laser pulses of 50 fs duration at 2 eV. Both the dynamics of the transient surface field, as well as the coherent lattice vibration, are measured via electro-optic sampling techniques under different experimental conditions. The driving force for the coherent phonon vibration is the sudden depolarization of the crystal lattice due to ultrafast screening of the intrinsic electrical surface field by photoexcited free carriers.

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