SPATIAL POTENTIAL DISTRIBUTION IN GAAS/ALXGA1-XAS HETEROSTRUCTURES UNDER QUANTUM HALL CONDITIONS STUDIED WITH THE LINEAR ELECTROOPTIC EFFECT

被引:81
作者
FONTEIN, PF
KLEINEN, JA
HENDRIKS, P
BLOM, FAP
WOLTER, JH
LOCHS, HGM
DRIESSEN, FAJM
GILING, LJ
BEENAKKER, CWJ
机构
[1] PHILIPS RES LABS,5600 JA EINDHOVEN,NETHERLANDS
[2] CATHOLIC UNIV NIJMEGEN,6525 ED NIJMEGEN,NETHERLANDS
来源
PHYSICAL REVIEW B | 1991年 / 43卷 / 14期
关键词
D O I
10.1103/PhysRevB.43.12090
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We apply the linear electro-optic effect (Pockels effect) to investigate the spatial potential distribution in GaAs/AlxGa1-xAs heterostructures under quantum Hall conditions. With this method, which avoids electrical contacts and thus does not disturb the potential distribution, we probe the electrostatic potential of the two-dimensional electron gas (2DEG) locally. Scanning across the sample we observe a steep change of the Hall potential at the edges of the 2DEG over a distance of about 70-mu-m, the lateral resolution of the experimental setup. This change at the edges accounts for more than 80% of the total Hall voltage. The remainder of the Hall potential is distributed in the interior of the sample and varies linearly with the position. The results are interpreted in terms of unscreened charge at the edges.
引用
收藏
页码:12090 / 12093
页数:4
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