期刊
PHYSICAL REVIEW B
卷 84, 期 19, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.84.195303
关键词
-
资金
- NSF [DMR-0904117, MRSEC DMR-0819860]
- DOE BES [DE-FG0200-ER45841]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [819860] Funding Source: National Science Foundation
Magnetotransport measurements in a wide GaAs quantum well in which we can tune the Fermi energy (E-F) to lie in different Landau levels of the two occupied electric subbands reveal a remarkable pattern for the appearance and disappearance of fractional quantum Hall states at nu = 10/3, 11/3, 13/3, 14/3, 16/3, and 17/3. The data provide direct evidence that the q/3 states are stable and strong even at such high fillings as long as E-F lies in a ground-state (N = 0) Landau level of either of the two electric subbands, regardless of whether that level belongs to the symmetric or the antisymmetric subband. Evidently, the node in the out-of-plane direction of the antisymmetric subband does not destabilize the q/3 fractional states. On the other hand, when E-F lies in an excited (N > 0) Landau level of either subband, the wave function node(s) in the in-plane direction weaken or completely destabilize the q/3 fractional quantum Hall states. Our data also reveal that the strength of the q/3 fractional states near the crossing of two Landau levels belonging to the two subbands depends on the relative spin polarization of the levels; specifically, the states remain stable very near the crossing if the two levels have parallel spins.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据