The Effect of Exchange-Correlation Holes on the Temperature Dependent Dynamic Dielectric Function of Single-Layer Quantum Wells and Coupled Nanolayers
In this paper, for the first time we have studied theoretically the effect of exchange-correlation holes around electrons in GaAlAs/GaAs/GaAlAs nanostructure on the temperature-dependent dynamic dielectric function of two-dimensional electron gas by employing random phase, STLS and Hubbard approxima...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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Nanoscience and Nanotechnology Research Center, University of Kashan
2013-12-01
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| Series: | Journal of Nanostructures |
| Subjects: | |
| Online Access: | http://jns.kashanu.ac.ir/article_5926_89055e6a94cb442ccf07d25335a3e79c.pdf |
| Summary: | In this paper, for the first time we have studied theoretically the effect of exchange-correlation holes around electrons in GaAlAs/GaAs/GaAlAs nanostructure on the temperature-dependent dynamic dielectric function of two-dimensional electron gas by employing random phase, STLS and Hubbard approximations. Also, we have investigated another interesting system which is coupled quantum wells structure. To make a good comparison and show the effect of local field, the numerical results have been compared with those obtained within RPA which considers long-range interactions and ignores exchange-correlation effects completely. We found that taking into account the exchange-correlation effects changes considerably the values of dynamic dielectric function at low electron densities at finite temperatures. |
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| ISSN: | 2251-7871 2251-788X |