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Updated: Aug 15, 2026

Advanced Experimental Methods for Low-temperature Magnetotransport Measurement of Novel Materials
Published on: January 21, 2016
Observation of multiple magnetorotons in the fractional quantum Hall effect
M Kang1, A Pinczuk, B S Dennis
1Bell Labs, Lucent Technologies, Murrray Hill, NJ 07974, USA.
Abstract:
Magnetorotons in the dispersions of collective gap excitation modes of fractional quantum Hall liquids are measured in resonant inelastic light scattering experiments. Two deep magnetoroton minima are observed at nu = 2/5, while a single deep minimum is resolved at nu = 1/3. The observations are the first evidence of multiple roton minima in gap excitations of the quantum liquids. The results support Chern-Simons and composite fermion calculations that predict multiple roton minima for states with nu>1/3.
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