Observation of a Fractional Quantum Hall State at ν=1/4 in a Wide GaAs Quantum Well

被引：59
|
作者：
Luhman, D. R. [1 ]
Pan, W. [2 ]
Tsui, D. C. [1 ]
Pfeiffer, L. N. [3 ]
Baldwin, K. W. [3 ]
West, K. W. [3 ]
机构：
[1] Princeton Univ, Dept Elect Engn, Princeton, NJ 08544 USA
[2] Sandia Natl Labs, Albuquerque, NM 87195 USA
[3] Lucent Technol, Bell Labs, Murray Hill, NJ 07974 USA
来源：
PHYSICAL REVIEW LETTERS | 2008年 / 101卷 / 26期
基金：
美国国家科学基金会;
关键词：
D O I：
10.1103/PhysRevLett.101.266804
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We report the observation of an even-denominator fractional quantum Hall state at nu=1/4 in a high quality, wide GaAs quantum well. The sample has a quantum well width of 50 nm and an electron density of n(e)=2.55x10(11) cm(-2). We have performed transport measurements at T similar to 35 mK in magnetic fields up to 45 T. When the sample is perpendicular to the applied magnetic field, the diagonal resistance displays a kink at nu=1/4. Upon tilting the sample to an angle of theta=20.3 degrees a clear fractional quantum Hall state emerges at nu=1/4 with a plateau in the Hall resistance and a strong minimum in the diagonal resistance.
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页数：4
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