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
收藏
页码：152 / 159
页数：8
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