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arXiv 0801.3312cond-mat.mes-hall
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nu=5/2分数量子Hall态的本征能隙

Intrinsic Gap of the nu=5/2 Fractional Quantum Hall State

C. R. Dean, B. A. Piot, P. Hayden, S. Das Sarma, G. Gervais, L. N. Pfeiffer, K. W. West

摘要:

分数量子霍尔效应是在低场下观察到的,在一个制度,回旋能量小于库仑相互作用。nu=5/2激发间隙在~2.6 T下测量为262+/-15 mK,与先前对具有类似迁移率但电子密度大两倍的样品进行的测量非常一致。的作用,无序的nu=5/2的差距进行检查。实验和理论之间的比较表明,一个很大的差异仍然是从无限的流动性(零无序)限制外推的本征间隙。相比之下,对于nu=1/3的Laughlin态,没有发现如此大的差异。在低场制度的观察nu=5/2状态意味着,包括非微扰朗道能级混合可能是必要的,以更好地理解半填充分数量子霍尔液体的能量。

英文摘要:

The fractional quantum Hall effect is observed at low field, in a regime where the cyclotron energy is smaller than the Coulomb interaction. The nu=5/2 excitation gap is measured to be 262+/-15 mK at ~2.6 T, in good agreement with previous measurements performed on samples with similar mobility, but with electronic density larger by a factor of two. The role of disorder on the nu=5/2 gap is examined. Comparison between experiment and theory indicates that a large discrepancy remains for the intrinsic gap extrapolated from the infinite mobility (zero disorder) limit. In contrast, no such large discrepancy is found for the nu=1/3 Laughlin state. The observation of the nu=5/2 state in the low-field regime implies that inclusion of non-perturbative Landau level mixing may be necessary to better understand the energetics of half-filled fractional quantum hall liquids.

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