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arXiv 0704.2215cond-mat.mes-hallcond-mat.str-el
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自旋-轨道耦合对量子霍尔位相的影响

Impact of spin-orbit coupling on quantum Hall nematic phases

M. J. Manfra, R. de Picciotto, Z. Jiang, S. H. Simon, L. N. Pfeiffer, K. W. West, A. M. Sergent

摘要:

在填充因子nu=7/2、nu=11/2和nu=13/2的垂直磁场中,在低温下观察到二维空穴系统中的各向异性电荷输运.与此形成鲜明对比的是,在nu=9/2处的输运对于所有温度都是各向同性的。各向同性空穴传输在nu=7/2恢复足够低的二维密度或非对称的限制潜力。所观察到的各向异性的密度和对称性的依赖性表明,在空穴系统中的强自旋轨道耦合有助于不寻常的输运行为。

英文摘要:

Anisotropic charge transport is observed in a two-dimensional (2D) hole system in a perpendicular magnetic field at filling factors nu=7/2, nu=11/2, and nu=13/2 at low temperature. In stark contrast, the transport at nu=9/2 is isotropic for all temperatures. Isotropic hole transport at nu=7/2 is restored for sufficiently low 2D densities or an asymmetric confining potential. The density and symmetry dependences of the observed anisotropies suggest that strong spin-orbit coupling in the hole system contributes to the unusual transport behavior.

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