Space-charge electric field in photorefractive multiple quantum wells

被引：3
|
作者：
Zhang, Xiangxue [1 ,3 ]
Samiullah, Mohammad [2 ,3 ]
Yu, Ping [3 ]
机构：
[1] Beijing Forestry Univ, Coll Sci, Beijing 100083, Peoples R China
[2] Truman State Univ, Dept Phys, Kirksville, MO 63501 USA
[3] Univ Missouri, Dept Phys & Astron, Columbia, MO 65211 USA
来源：
APPLIED PHYSICS LETTERS | 2010年 / 96卷 / 15期
基金：
美国国家科学基金会;
关键词：
aluminium compounds; gallium arsenide; III-V semiconductors; optical modulation; photoconductivity; photorefractive materials; semiconductor quantum wells; space charge; TRANSPORT; HOLOGRAMS;
D O I：
10.1063/1.3367728
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We have developed a graphical method to determine the space-charge electric field in photorefractive multiple quantum wells when the photocurrent is dominated by the drift current. The minima and maxima of the space-charge electric field due to space modulated light intensity are obtained from photocurrent measurements under uniform illumination. In addition, we find that the space-charge field depends nonlinearly on the applied electric field and the intensity of light, and changes sharply with the intensity up to a critical intensity beyond which it remains unchanged.
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页数：3
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