Collective Properties of Excitons in Presence of a Two-Dimensional Electron Gas

Details Collective Properties of Excitons in Presence of a Two-Dimensional Electron Gas Collective Properties of Excitons in Presence of a Two-Dimensional Electron Gas

2010-02-13

arxiv.org/abs/1002.2736v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

10 pages, 1 figure. accepted by Solid State Communications

Scientific paper

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 increases 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.

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