Open AccessCoherent Oscillation of Zone-Folded Phonon Modes in GaAs-AlAs Superlattices
Author(s) -
Aishi Yamamoto,
Tomobumi Mishina,
Yasuaki Masumoto,
Masaaki Nakayama
Publication year - 1994
Publication title -
physical review letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.688
H-Index - 673
eISSN - 1079-7114
pISSN - 0031-9007
DOI - 10.1103/physrevlett.73.740
Subject(s) - dephasing , superlattice , phonon , oscillation (cell signaling) , excited state , femtosecond , condensed matter physics , physics , symmetry (geometry) , reflection (computer programming) , optics , materials science , atomic physics , laser , geometry , mathematics , computer science , genetics , programming language , biology
We have observed a coherent oscillation of zone-folded acoustic phonons in GaAs-AlAs superlattices for the first time by means of a femtosecond time-resolved pump-probe technique. The oscillatory component in the 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
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