Correlations in a two-dimensional Bose gas with long range interactions

Abstract

We study the correlations of two-dimensional dipolar excitons in coupled quantum wells with a dipole -- dipole repulsive interaction. We show that at low concentrations, the Bose degeneracy of the excitons is accompanied by strong multi-particle correlations and the system behaves as a Bose liquid. At high concentration the particles interaction suppresses quantum coherence and the system behaves similar to a classical liquid down to a temperature lower than typical for a Bose gas. We evaluate the interaction energy per particle and the resulting blue shift of the exciton luminescence that is a direct tool to measure the correlations. This theory can apply to other systems of bosons with extended interaction.

11 pages including 2 figures

References in corpus (2)

• Strongly correlated 2D quantum phases with cold polar molecules: controlling the shape of the interaction potential
• Vibrational modes and low-temperature thermal properties of graphene and carbon nanotubes: A minimal force-constant model

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