Intrinsic gap of the ν=5/2 fractional quantum Hall state

被引：90

作者：

Dean, C. R. ^{[1
]}

Piot, B. A. ^{[1
]}

Hayden, P. ^{[2
]}

Das Sarma, S. ^{[3
]}

Gervais, G. ^{[1
]}

Pfeiffer, L. N. ^{[4
]}

West, K. W. ^{[4
]}

机构：

[1] McGill Univ, Dept Phys, Montreal, PQ H3A 2T8, Canada

[2] McGill Univ, Sch Comp Sci, Montreal, PQ H3A 2A7, Canada

[3] Univ Maryland, Dept Phys, Condensed Matter Theory Ctr, College Pk, MD 20742 USA

[4] Alcatel Lucent Labs, Bell Labs, Murray Hill, NJ 07974 USA

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 100卷 / 14期

关键词：

D O I：

10.1103/PhysRevLett.100.146803

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The fractional quantum Hall effect is observed at low magnetic field where the cyclotron energy is smaller than the Coulomb interaction energy. The nu=5/2 excitation gap at 2.63 T is measured to be 262 +/- 15 mK, similar to values obtained in samples with twice the electronic density. Examining the role of disorder on the 5/2 state, we find that a large discrepancy remains between theory and experiment for the intrinsic gap extrapolated from the infinite mobility limit. The observation of a 5/2 state in the low-field regime suggests that inclusion of nonperturbative Landau level mixing may be necessary to fully understand the energetics of half-filled fractional quantum Hall liquids.

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页数：4

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