Diffusion of two dimensional magnetoexcitons

被引：6

作者：

Pulizzi, F ^{[1
]}

Thijssen, WHA ^{[1
]}

Christianen, PCM ^{[1
]}

Maan, JC ^{[1
]}

机构：

[1] Univ Nijmegen, Mat Res Inst, High Field Magnet Lab, NL-6525 ED Nijmegen, Netherlands

来源：

PHYSICA B | 2001年 / 298卷 / 1-4期

关键词：

excitons; optics; diffusion; GaAs/GaAlAs;

D O I：

10.1016/S0921-4526(01)00358-1

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The two dimensional diffusion of single excitons in GaAs/AlGaAs quantum wells has been measured, at 4.2 K and in magnetic fields B up to 12 T, using spatially-resolved photoluminescence spectroscopy. At zero field an exceptionally high diffusion constant D (600 cm(2)/s) has been found, which reduces quadratically with the application of a small B, due to the field induced increase of the excitonic mass. For higher magnetic fields the diffusion constant decreases as D similar to B-2, in agreement with theoretical predictions which include quantum corrections in the exciton motion. (C) 2001 Elsevier Science B.V. All rights reserved.

引用

页码：441 / 445

页数：5

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