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Paper   IPM / Physic / 6779
School of Physics
  Title:   Correlations in A Multisubband Quasi-One-Dimensional Electron Gas
1.  N. Naffari
2.  R. Asgari
  Status:   Published
  Journal: Phys. Rev. B
  No.:  48
  Vol.:  62
  Year:  2000
  Pages:   16001-16017
  Supported by:  IPM
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 S?lander (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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