Relation between spin and momentum relaxation in ZnSe/ZnMgSSe quantum wells

被引：6

作者：

Hägele, D

Oestreich, M

Rühle, WW

Hoffmann, J

Wachter, S

Kalt, H

Ohkawa, K

Hommel, D

机构：

[1] Univ Marburg, Fachbereich Phys, D-35032 Marburg, Germany

[2] Wissensch Zentrum Mat Wissensch, D-35032 Marburg, Germany

[3] Univ Karlsruhe, Inst Angew Phys, D-76128 Karlsruhe, Germany

[4] Univ Bremen, Inst Festkorperphys, D-28334 Bremen, Germany

来源：

PHYSICA B | 1999年 / 272卷 / 1-4期

关键词：

ZnSe; spin relaxation; momentum relaxation; exciton dissociation;

D O I：

10.1016/S0921-4526(99)00300-2

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

First, are measure the coherence time of optically oriented carrier spins in wide gap quantum wells and observe an increase with temperature from less than 10 ps at 20 K to 500 ps at 200 K. Second, we measure the temperature dependence of the momentum relaxation time by four wave mixing and absorption experiments. The spin relaxation time is approximately proportional to the inverse of the momentum relaxation time. In the low-temperature regime, the strong increase of spin lifetime can be caused by motional narrowing due to the faster scattering of excitons with increasing temperature. In the high-temperature regime, quenching of the electron-hole spin flip dephasing due to an increasing ionization of excitons with increasing temperatures can prolongate spin lifetime. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：338 / 340

页数：3