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Direct Observation of Femtosecond Intervalley Scattering in GaSb: Electron–Phonon Scattering and Continuum Coherent Transients
Author(s) -
Smith D. C.,
O'Sullivan E. D.,
Rota L.,
Maciel A. C.,
Ryan J. F.
Publication year - 1997
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/1521-3951(199711)204:1<110::aid-pssb110>3.0.co;2-y
Subject(s) - femtosecond , scattering , excited state , coherence (philosophical gambling strategy) , electron , condensed matter physics , physics , raman scattering , quantum well , phonon , atomic physics , raman spectroscopy , molecular physics , materials science , optics , laser , quantum mechanics
Femtosecond Γ–L intervalley electron scattering has been observed in bulk GaSb and GaSb/AlSb quantum wells using time‐resolved differential transmission and Raman spectroscopy. The reverse process is found to occur on a significantly longer time scale due to long‐lived Γ state occupancy. The results are in good agreement with Monte Carlo simulations. GaSb quantum wells display an additional ultrafast induced absorption when continuum states are excited which may arise from electron–hole coherence effects.