Exchange- and correlation-induced charge transfer observed in independently contacted triple-quantum-well structures

被引：9

作者：

Patel, NK ^{[1
]}

Millard, IS ^{[1
]}

Linfield, EH ^{[1
]}

Rose, PD ^{[1
]}

Grimshaw, MP ^{[1
]}

Ritchie, DA ^{[1
]}

Jones, GAC ^{[1
]}

Pepper, M ^{[1
]}

机构：

[1] UNIV CAMBRIDGE,CAVENDISH LAB,CAMBRIDGE CB3 0HE,ENGLAND

来源：

PHYSICAL REVIEW B | 1996年 / 53卷 / 23期

关键词：

D O I：

10.1103/PhysRevB.53.15443

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

There have been predictions that for closely spaced two-dimensional electron gases (2DEG's), charge transfer between the 2DEG's can arise from electron interactions due to exchange and correlation [Ruden and Wu, Appl. Phys. Lett. 59, 2165 (1991)]. In this study, we are able to determine accurately the charge in each of the 2DEG's of a triple-quantum-well structure. The results demonstrate that as the charge in one 2DEG is reduced, by applying a negative gate voltage the adjacent layer can gain charge; thus charge is effectively transferred between the 2DEG's. This type of charge transfer cannot be explained by a simple noninteracting model of the structure, but can be modeled by including intralayer electron interactions in the form of exchange and correlation correction terms within the local-density approximation. The inclusion of these many-body interaction terms into our model leads to a good qualitative agreement with the experimental data, confirming that the origin of the charge transfer is electron interactions.

引用

页码：15443 / 15446

页数：4

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