FEMTOSECOND-LUMINESCENCE STUDY OF ELECTRON-TRANSFER IN TYPE-II GAAS ALAS SUPERLATTICES - INTERVALLEY SCATTERING VERSUS STATE MIXING/

Authors
DEVEAUD B CLEROT F REGRENY A PLANEL R GERARD JM
Citation
B. Deveaud et al., FEMTOSECOND-LUMINESCENCE STUDY OF ELECTRON-TRANSFER IN TYPE-II GAAS ALAS SUPERLATTICES - INTERVALLEY SCATTERING VERSUS STATE MIXING/, Physical review. B, Condensed matter, 49(19), 1994, pp. 13560-13563
Citations number
22
Categorie Soggetti
Physics, Condensed Matter
Journal title
Physical review. B, Condensed matter → ACNP
ISSN journal
01631829
Volume
49
Issue
19
Year of publication
1994
Pages
13560 - 13563
Database
ISI
SICI code
0163-1829(1994)49:19<13560:FSOEIT>2.0.ZU;2-7
Abstract
We use luminescence with femtosecond resolution to study the transfer of electrons from the GaAs layers to the AlAs layers in type-II GaAs/A lAs superlattices. Transfer times are measured to vary from 140 fs to 25 ps depending on superlattice parameters and on the temperature. The temperature dependence, the absence of resonance effects, and the com parison with theory evidence the predominance of phonon-assisted inter valley scattering and rules out the contribution of state mixing as a transfer mechanism.