EXCITATIONS OF THE STRONGLY CORRELATED ELECTRON LIQUID IN COUPLED LAYERS

被引：59

作者：

NEILSON, D ^{[1
]}

SWIERKOWSKI, L ^{[1
]}

SZYMANSKI, J ^{[1
]}

LIU, L ^{[1
]}

机构：

[1] TELECOM AUSTRALIA,RES LABS,CLAYTON,VIC 3168,AUSTRALIA

来源：

PHYSICAL REVIEW LETTERS | 1993年 / 71卷 / 24期

关键词：

D O I：

10.1103/PhysRevLett.71.4035

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The low-lying excited states in a system of coupled layers of electrons in a gallium arsenide heterostructure are strongly affected by many-body correlations between the electrons for densities as high as r(s) = 5. For a layer spacing of less than 100 nm the function Im(chi)(q, omega) near q = 1.9k(F) has a large peak at small omega which is apparently a soft-mode precursor to a charge density wave instability. This new peak should be observable with present experimental techniques in realistic samples. The linear gradient of the ''acoustic'' plasmon is depressed so much by many-body effects that for r(s) = 5 it can become degenerate with the single-particle excitation spectrum for all q.

引用

页码：4035 / 4038

页数：4

共 39 条

[1] COLLECTIVE MODES OF A SUPER-LATTICE - PLASMONS, LO PHONON-PLASMONS, AND MAGNETOPLASMONS [J].