Shift currents from symmetry reduction and Coulomb effects in (110)-orientated GaAs/Al0.3Ga0.7As quantum wells

被引：42

作者：

Bieler, Mark ^{[1
]}

Pierz, Klaus ^{[1
]}

Siegner, Uwe ^{[1
]}

机构：

[1] Phys Tech Bundesanstalt, D-38116 Braunschweig, Germany

来源：

PHYSICAL REVIEW B | 2007年 / 76卷 / 16期

关键词：

D O I：

10.1103/PhysRevB.76.161304

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report on the observation of an additional shift current tensor element by interband excitation of undoped (110)-oriented GaAs/Al(0.3)Ga(0.7)As quantum wells with a 150 fs laser pulse. The additional tensor element results from the symmetry reduction of the quantum well structure and shows a strong enhancement and a phase shift at the light-hole exciton transition revealing that shift currents are a sensitive probe of Coulomb effects in semiconductors. Moreover, we show that the overall shift current does not directly follow the envelope of the optical excitation pulse but contains a noninstantaneous contribution.

引用

页数：4

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