Dispersion of two-dimensional plasmons in GaAs quantum well and Ag monolayer

We study theoretically the role of finite temperature, exchange-correlations and finite layer width in explicating experimental findings on dispersion of two-dimensional plasmons in GaAs single quantum well and Ag monolayer. The plasmon energy is obtained from the poles of electron density response...

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Bibliographic Details
Published in:Physica. E, Low-dimensional systems & nanostructures Low-dimensional systems & nanostructures, 2015-05, Vol.69, p.13-18
Main Authors: Bhukal, Nisha, Priya, Moudgil, R.K.
Format: Article
Language:English
Subjects:
Exchange-correlation effects
Plasmon dispersion
Two-dimensional electron gas
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Summary:We study theoretically the role of finite temperature, exchange-correlations and finite layer width in explicating experimental findings on dispersion of two-dimensional plasmons in GaAs single quantum well and Ag monolayer. The plasmon energy is obtained from the poles of electron density response function determined by using the finite-temperature self-consistent mean-field theory of Singwi et al. Except for ultra low electron densities (as in GaAs system), our results exhibit a reasonably good agreement with the experimental data. While correlations are found to introduce a noticeable red shift in plasmon frequency, temperature has an opposite effect. Both of these effects become increasingly important with reduction in electron density. At ultra low densities, our predictions agree only for small wave vectors (q
ISSN:1386-9477
1873-1759
DOI:10.1016/j.physe.2015.01.007