Robust, Stable Single-Exciton Emission from an Ultrahigh-Density Magneto-plasma

Details Robust, Stable Single-Exciton Emission from an Ultrahigh-Density Magneto-plasma Robust, Stable Single-Exciton Emission from an Ultrahigh-Density Magneto-plasma

2010-09-16

arxiv.org/abs/1009.3067v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures

Scientific paper

Conventional wisdom has it that excitons in semiconductors become unstable at high densities against dissociation into electrons and holes. Here, we show that an ultrahigh-density 2D electron-hole magneto-plasma emits light as a gas of non-interacting magneto-excitons. We observe a series of stimulated emission lines whose magnetic field dependence remains excitonic even at densities beyond 10$^{13}$ cm$^{-2}$. The extremely robust excitonic character of these lines is in contrast to their renormalized energies and masses indicating strong many-body interactions and extending the concept of `hidden symmetry' of 2D magneto-excitons expected only in the high magnetic field limit. This unusual stability of high-density excitons is promising for further studies of bosonic many-body physics in solids at quantum degenerate densities.

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