Collective properties of excitons in the presence of a two-dimensional electron gas

  • Berman O
  • Gumbs G
  • Folkes P
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Abstract

We have studied the collective properties of two-dimensional (2D) excitons immersed within a quantum well which contains 2D excitons and a two-dimensional electron gas (2DEG). We have also analyzed the excitations for a system of 2D dipole excitons with spatially separated electrons and holes in a pair of quantum wells (CQWs) when one of the wells contains a 2DEG. Calculations of the superfluid density and the Kosterlitz-Thouless (K-T) phase transition temperature for the 2DEG-exciton system in a quantum well have shown that the K-T transition temperature increase with increasing exciton density and that it might be possible to have fast long-range transport of excitons. The superfluid density and the K-T transition temperature for dipole excitons in CQWs in the presence of a 2DEG in one of the wells increases with increasing inter-well separation. © 2010 Elsevier Ltd.

Author-supplied keywords

  • A. Quantum wells
  • A. Semiconductors
  • D. Electron-electron interactions
  • D. Phase transitions

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