Shift photocurrent induced by two-quantum transitions

被引：13

作者：

Golub, L. E. ^{[1
]}

Ivchenko, E. L. ^{[1
]}

机构：

[1] Russian Acad Sci, AF Ioffe Physicotech Inst, St Petersburg 194021, Russia

来源：

JOURNAL OF EXPERIMENTAL AND THEORETICAL PHYSICS | 2011年 / 112卷 / 01期

基金：

俄罗斯基础研究基金会;

关键词：

GAAS;

D O I：

10.1134/S1063776110061032

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A theory of the shift current induced by direct two-photon and indirect one-photon absorption is developed for noncentrosymmetric crystals. A formula is derived for the microscopic shifts of Bloch electrons induced by two-quantum processes. It is shown that the ratio of the two-photon photocurrent at the photon frequency omega to the photocurrent induced by direct one-photon transitions at the photon frequency 2 omega, as compared to the corresponding absorption-rate ratio, contains a large factor {ie152-1}omega/(2{ie152-2}omega - E (g)), where E (g) is the bandgap; i.e., these photocurrent can be comparable in order of magnitude. For crystals of T (d) symmetry, the photocurrents induced by one- and two-photon absorption are compared in terms of polarization dependence.

引用

页码：152 / 159

页数：8

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