EXCITON FORMATION AND RELAXATION DYNAMICS IN QUANTUM WIRES

Citation
R. Kumar et al., EXCITON FORMATION AND RELAXATION DYNAMICS IN QUANTUM WIRES, Physical review letters, 81(12), 1998, pp. 2578-2581
Citations number
23
Categorie Soggetti
Physics
Journal title
ISSN journal
00319007
Volume
81
Issue
12
Year of publication
1998
Pages
2578 - 2581
Database
ISI
SICI code
0031-9007(1998)81:12<2578:EFARDI>2.0.ZU;2-6
Abstract
The dynamics of one-dimensional (1D) excitons is investigated in a GaA s/AlAs quantum wire array (QWR-A) using picosecond time resolved photo luminescence (PL) measurements. The excitation density is 4 x 10(4) cm (-1), a factor of 20 below the Mott density. The rise and decay time c onstants of the excitonic PL in the QWR-A are 55 and 450 psec, respect ively. The exciton formation time in 1D is determined to be approximat e to 30 psec. Our results suggest that exciton-acoustic-phonon scatter ing is enhanced in 1D. However, the rates of exciton scattering with c arriers and excitons is reduced. [S001-9007(98)07167-1].