Plasmonic contribution to the van der Waals energy in strongly interacting bilayers
Date
2010Source Title
PHYSICAL REVIEW B
Print ISSN
1098-0121
Publisher
The American Physical Society
Volume
81
Issue
11
Pages
115326-1 - 115326-7
Language
English
Type
ArticleItem Usage Stats
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Abstract
We investigate the van der Waals or interaction energy due to the plasmon modes in bilayer fermion and
boson systems for several layer separation and coupling strength values. Interaction effects are studied within
the random-phase approximation
RPA
, the quasilocalized charge approximation
QLCA
, and the Singwi,
Tosi, Land, and Sjölander
STLS
models of the dielectric function formalism. We find that the interaction
becomes repulsive at short separation distances for strongly coupled systems described by the QLCA and
STLS approaches in contrast to attractive behavior predicted by the RPA. At larger separation distances, the
interaction energy changes sign within the QLCA and STLS models leading to an attractive interaction. The
evident relation between our calculations and the Casimir effect is emphasized