Experimental evidence for new particles in the fractional quantum Hall effect.
Experimental evidence for new particles in the fractional quantum Hall effect.
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DOI：
10.1103/physrevlett.70.2944
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发表时间：
1993-05
影响因子：
8.6
通讯作者：
Rui-Rui Du-Rui;H. Stormer;D. C. Tsui;Pfeiffer Ln;K. West
中科院分区：
文献类型：
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作者：
Rui-Rui Du-Rui;H. Stormer;D. C. Tsui;Pfeiffer Ln;K. West
我们已经确定了分数量子霍尔效应 (FQHE) 状态的两个突出序列在填充因子 ν=p/(2p±1) 约 ν=1/2 时的能隙。间隙随着 ΔB（磁场与半填充的偏差）线性增加。因此，这些数据与暴露于有效磁场 ΔB 的带电粒子 e、有效质量 m * 和寿命展宽 Γ 的 Shubnikov-de Haas 振荡无法区分。我们的发现与 FQHE 中复合粒子的最新提议以及偶数分母填充物中费米表面的存在非常一致
We have determined the energy gaps of both prominent sequences of fractional quantum Hall effect (FQHE) states at filling factor ν=p/(2p±1) around ν=1/2. The gaps increase linearly with ΔB, the deviation of the magnetic field from half filling. Therefore, the data are indistinguishable from Shubnikov-de Haas oscillations of particles of charge e, effective mass m * , and lifetime broadening Γ exposed to an effective magnetic field ΔB. Our findings are remarkably consistent with recent proposals of composite particles in the FQHE and the existence of a Fermi surface at even-denominator fillings