Effects of magnetic field and optical fluence on terahertz emission in gallium arsenide

被引：24

作者：

Corchia, A

McLaughlin, R

Johnston, MB

Whittaker, DM

Arnone, DD

Linfield, EH

Davies, AG

Pepper, M

机构：

[1] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England

[2] Toshiba Res Europe Ltd, Cambridge Res Lab, Cambridge CB4 0WE, England

来源：

PHYSICAL REVIEW B | 2001年 / 64卷 / 20期

关键词：

D O I：

10.1103/PhysRevB.64.205204

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The excitation density dependence of magnetic-field-enhanced terahertz (THz=10(12) Hz) emission from (100) GaAs is studied. It is found that THz power saturates at a higher optical-excitation density, when a magnetic field is applied. This observation explains the different magnetic field enhancements that have been reported recently. At low excitation densities the results are shown to be consistent with a simple model of carrier-carrier scattering, whilst at higher densities surface field screening becomes important.

引用

页数：5

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