Correlations in a multisubband quasi-one-dimensional electron gas

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Nafari, N ; Sharif University of Technology | 2000

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Type of Document: Article
DOI: 10.1103/PhysRevB.62.16001
Publisher: 2000
Abstract:
This paper is an extension of an earlier work on electron correlations in semiconducting GaAs-based quasi-one-dimensional quantum wires. The extension was twofold. First, we developed the Singwi, Tosi, Land, and Sölander (STLS) scheme for multisubband structures. Secondly, we developed the multisubband ladder approximation diagrammatic technique. By using the results obtained for the spin symmetric and spin antisymmetric interpolarization and intrapolarization potentials, we calculate the corresponding electron-electron effective potentials. Our results for a two-subband model show that these effective potentials have an attractive part implying the occurrence of s-wave and p-wave pairings, and thereby, suggesting the observation of s-wave and p-wave intrinsic superconductivity. In addition, by using the set of self-consistent multisubband STLS equations for a two-subband model, we have calculated the spin symmetric and spin antisymmetric interpair and intrapair correlation functions, as well as the static structure factors. Also the collective charge and spin density excitations are computed and compared with experiments. The results are in excellent agreement with experimental data
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Source: Physical Review B - Condensed Matter and Materials Physics ; Volume 62, Issue 23 , 2000 , Pages 16001-16017 ; 01631829 (ISSN)
URL: https://journals.aps.org/prb/abstract/10.1103/PhysRevB.62.16001