Spill relaxation and spin-dependent exciton interactions in ZnSe quantum wells

被引:3
作者
Kalt, H
Hoffmann, J
Tröndle, D
Wachter, S
Lüerssen, D
Hägele, D
Rühle, WW
Oestreich, M
Blewett, IJ
Galbraith, I
机构
[1] Univ Karlsruhe, Inst Angew Phys, D-76128 Karlsruhe, Germany
[2] Univ Marburg, Wissensch Zentrum Mat Wissensch, D-35032 Marburg, Germany
[3] Univ Marburg, Fachbereich Phys, D-35032 Marburg, Germany
[4] Heriot Watt Univ, Dept Phys, Edinburgh EH14 4AS, Midlothian, Scotland
关键词
ZnSe/ZnMgSSe; quantum wells; exciton spin; quantum beats; four-wave mixing; dephasing;
D O I
10.1016/S0022-0248(00)00167-6
中图分类号
O7 [晶体学];
学科分类号
0702 ; 070205 ; 0703 ; 080501 ;
摘要
We demonstrate the mutual influence of the dynamics in the real-space and the spin Darts of the exciton wavefunction evoked by the exchange interaction. In the regime of high exciton density, the exciton-exciton interaction in ZnSe/ZnMgSSe quantum wells is found to be: strongly affected by the exciton spin orientation and the longitudinal spin relaxation via single-fermion spin flips. The exciton's homogeneous linewidth as deduced front degenerate four-wave mixing with prepulse is significantly enhanced in spin-pure exciton populations by scattering including fermionic exchange. The transverse spin relaxation in the low-density limit is deduced from the decay of spill quantum-beats in photoluminescence experiments. We find an anti-proportionality between the spin relaxation and the optical dephasing times. The temperature dependence of both relaxation times is determined by the exciton-phonon interaction. The latter gradually reduces the electron-hole exchange coupling which is the dominating term in the exciton's transverse spin relaxation. (C) 2000 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:630 / 633
页数:4
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