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Anomalous structure in the single particle spectrum of the fractional quantum Hall effect

Filtered TDCS spectrum at 13.5 Tesla showing sashes."Anomalous structure in the single particle spectrum of the fractional quantum Hall effect", Nature 464, 566-570 (25 March 2010).

The single particle spectrum of a system reveals the energies of its quasiparticles; charged, long lived excitations. We measure the single particle spectrum of a 2D electron gas in the fractional quantum Hall regime. Despite the intensive study this system has received in the past, the structure of this spectrum is completely unexpected; the features we previously observed in the quantum Hall effect break up into a series of sharp features that disperse linearly in energy with density.

For an overview of the technique, you should look at our recent work, or Oliver's PhD thesis.