Spin depolarization for excitons in quantum wires

被引:5
作者
Larousserie, D [1 ]
Ferreira, R [1 ]
机构
[1] Ecole Normale Super, Phys Mat Condensee Lab, F-75005 Paris, France
关键词
D O I
10.1103/PhysRevB.60.1892
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We consider theoretically the exchange coupling for independent excitons in quantum wires. The one-dimensional dispersions are complicated because the confinement energy due to the wire and the kinetic energy along the wire axis are comparable in such structures. For weakly confining structures, we discuss different contributions for the spin depolarization in the presence of spin-conserving scatterings, which depend on the exchange couplings between the various confined center-of-mass exciton motions. We also find that the spin coupling for free excitons increases with decreasing wire cross sections in the strong confinement regime. Finally, we show for a gas of independent excitons that the localization effects increase the spin-depolarization time and alters its temperature dependence.
引用
收藏
页码:1892 / 1899
页数:8
相关论文
共 17 条
[1]   Spin relaxation in polarized interacting exciton gas in quantum wells [J].
Amand, T ;
Robart, D ;
Marie, X ;
Brousseau, M ;
LeJeune, P ;
Barrau, J .
PHYSICAL REVIEW B, 1997, 55 (15) :9880-9896
[2]  
ANDREANI LC, 1995, NATO ADV STUDY I SER, V340
[3]   SPIN-FLIP SCATTERING TIMES IN SEMICONDUCTOR QUANTUM-WELLS [J].
BASTARD, G ;
FERREIRA, R .
SURFACE SCIENCE, 1992, 267 (1-3) :335-341
[4]  
Bastard G., 1988, WAVE MECH APPL SEMIC
[5]   Quantum-size effects on radiative lifetimes and relaxation of excitons in semiconductor nanostructures [J].
Bellessa, J ;
Voliotis, V ;
Grousson, R ;
Wang, XL ;
Ogura, M ;
Matsuhata, H .
PHYSICAL REVIEW B, 1998, 58 (15) :9933-9940
[6]  
Dyakonov M.I., 1984, OPTICAL ORIENTATION, V8
[7]  
DYAKONOV MI, 1986, SOV PHYS SEMICOND+, V20, P110
[8]   Fine structure of localized exciton levels in quantum wells [J].
Gupalov, SV ;
Ivchenko, EL ;
Kavokin, AV .
JOURNAL OF EXPERIMENTAL AND THEORETICAL PHYSICS, 1998, 86 (02) :388-394
[9]   Low-pressure organometallic chemical vapor deposition of quantum wires on V-grooved substrates [J].
Gustafsson, A ;
Reinhardt, F ;
Biasiol, G ;
Kapon, E .
APPLIED PHYSICS LETTERS, 1995, 67 (25) :3673-3675
[10]   ROOM-TEMPERATURE STUDY OF STRONG LATERAL QUANTIZATION EFFECTS IN INGAAS/INP QUANTUM WIRES [J].
ILS, P ;
MICHEL, M ;
FORCHEL, A ;
GYURO, I ;
KLENK, M ;
ZIELINSKI, E .
APPLIED PHYSICS LETTERS, 1994, 64 (04) :496-498