期刊
PHYSICAL REVIEW LETTERS
卷 86, 期 12, 页码 2637-2640出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.86.2637
关键词
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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 v = 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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