Kang M, Pinczuk A, Dennis BS, Pfeiffer LN, West KW. Observation of multiple magnetorotons in the fractional quantum Hall effect.
PHYSICAL REVIEW LETTERS 2001;
86:2637-2640. [PMID:
11289999 DOI:
10.1103/physrevlett.86.2637]
[Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/05/2000] [Indexed: 05/23/2023]
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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