Observation of multiple magnetorotons in the fractional quantum Hall effect

被引：54
|
作者：
Kang, M
Pinczuk, A
Dennis, BS
Pfeiffer, LN
West, KW
机构：
[1] Columbia Univ, Dept Appl Phys, New York, NY 10027 USA
[2] Columbia Univ, Dept Phys, New York, NY 10027 USA
[3] Bell Labs, Lucent Technol, Murray Hill, NJ 07974 USA
来源：
PHYSICAL REVIEW LETTERS | 2001年 / 86卷 / 12期
关键词：
D O I：
10.1103/PhysRevLett.86.2637
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
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.
引用
收藏
页码：2637 / 2640
页数：4
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