WEAK-LOCALIZATION AND ELECTRON-ELECTRON INTERACTIONS IN A 2-DIMENSIONAL GRID LATERAL SURFACE SUPERLATTICE

被引：11

作者：

LIANG, CT ^{[1
]}

SMITH, CG ^{[1
]}

NICHOLLS, JT ^{[1
]}

HUGHES, RJF ^{[1
]}

PEPPER, M ^{[1
]}

FROST, JEF ^{[1
]}

RITCHIE, DA ^{[1
]}

GRIMSHAW, MP ^{[1
]}

JONES, GAC ^{[1
]}

机构：

[1] TOSHIBA CAMBRIDGE RES CTR,260 CAMBRIDGE SCI PK,MILTON RD,CAMBRIDGE CB4 4WE,ENGLAND

来源：

PHYSICAL REVIEW B | 1994年 / 49卷 / 12期

关键词：

D O I：

10.1103/PhysRevB.49.8518

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Low-field magnetoresistance measurements were performed on a two-dimensional grid lateral surface superlattice (LSSL) fabricated on a GaAs/AlxGa1-xAs heterojunction. From a one-parameter fit to the two-dimensional weak-localization theory we have obtained the effective inelastic scattering length at different temperatures. By subtracting the weak-localization term, we have also investigated the electron-electron interactions in this system. Both localization and interaction effects saturate at low temperatures when the inelastic scattering length and thermal diffusion length are longer than the period of the LSSL. At higher temperatures, when the thermal diffusion length becomes comparable to the period of the LSSL, the electron-electron interaction term causes the conductivity to decrease logarithmically with temperature. These results can be explained in terms of coherent backscattering of the electrons in a fraction of the electron puddles formed below the superlattice gate. Disorder ensures that the cells showing these results are not neighbors, so that this effect is an ensemble average of many unit cells several periods apart.

引用

页码：8518 / 8521

页数：4

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