
%0 Journal Article
%A Swierkowski, L 
%A Neilson, D 
%A Szymanski, J 
%T Electron Liquid in Double-layer Structures
%J Australian Journal of Physics
%D 1993/06/01
%V 46
%N 3
%P 423-434
%K 
%R https://doi.org/10.1071/PH930423
%U https://www.publish.csiro.au/paper/PH930423 
%X Two layers of electrons or holes trapped at the adjacent interfaces of a gallium arsenide heterostructure can interact through the Coulomb interaction; this leads to a rich phase diagram of ground states, some of which are inhomogeneous in density. The cause of this is associated with each layer's acting as a polarisable background for the other, making it much easier for inhomogeneous configurations to be stable. Even in the uniform liquid phase the presence of a second layer can qualitatively change the nature of the low lying excitation spectrum and lead to large many-body effects in the spectrum, even at very long wavelengths. 
