Charged exctions in the fractional quantum Hall regime

Details Charged exctions in the fractional quantum Hall regime Charged exctions in the fractional quantum Hall regime

2001-03-27

arxiv.org/abs/cond-mat/0103561v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

10 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.87.216402

We study the photoluminescence spectrum of a low density ($\nu <1$) two-dimensional electron gas at high magnetic fields and low temperatures. We find that the spectrum in the fractional quantum Hall regime can be understood in terms of singlet and triplet charged-excitons. We show that these spectral lines are sensitive probes for the electrons compressibility. We identify the dark triplet charged-exciton and show that it is visible at the spectrum at $T<2$ K. We find that its binding energy scales like $e^{2}/l $, where $l$ is the magnetic length, and it crosses the singlet slightly above 15 T.

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