COHERENT OSCILLATION OF ZONE-FOLDED PHONON MODES IN GAAS-ALAS SUPERLATTICES

Authors
YAMAMOTO A MISHINA T MASUMOTO Y NAKAYAMA M
Citation
A. Yamamoto et al., COHERENT OSCILLATION OF ZONE-FOLDED PHONON MODES IN GAAS-ALAS SUPERLATTICES, Physical review letters, 73(5), 1994, pp. 740-743
Citations number
14
Categorie Soggetti
Physics
Journal title
Physical review letters → ACNP
ISSN journal
00319007
Volume
73
Issue
5
Year of publication
1994
Pages
740 - 743
Database
ISI
SICI code
0031-9007(1994)73:5<740:COOZPM>2.0.ZU;2-V
Abstract
We have observed a coherent oscillation of zone-folded acoustic phonon s in GaAs-AlAs superlattices for the first time by means of a femtosec ond time-resolved pump-probe technique. The oscillatory component in t he time-resolved reflection signal corresponds to the upper branch (B2 symmetry) of the first-order doublet mode. Carriers were selectively excited in well layers and the B2-symmetry phonon mode was selectively generated. The dephasing time of the B2 mode was measured to be 70 ps from our experiments.