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arXiv 0709.0718cond-mat.mes-hallcond-mat.str-el
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双层量子霍尔系统中有限温度相变的证据

Evidence for a finite temperature phase transition in a bilayer quantum Hall system

A. R. Champagne, J. P. Eisenstein, L. N. Pfeiffer, K. W. West

摘要:

研究了双层二维电子系统中强关联$ν_T = 1$量子霍尔相的类约瑟夫森层间隧穿特征随层间距、温度和层间电荷不平衡的变化关系.我们的研究结果提供了强有力的证据,有限的温度相变分离层间相干相缺乏强的层间关联的非相干相。转变温度取决于层间距和层之间的电荷不平衡。

英文摘要:

We study the Josephson-like interlayer tunneling signature of the strongly correlated $ν_T = 1$ quantum Hall phase in bilayer two-dimensional electron systems as a function of the layer separation, temperature and interlayer charge imbalance. Our results offer strong evidence that a finite temperature phase transition separates the interlayer coherent phase from incoherent phases which lack strong interlayer correlations. The transition temperature is dependent on both the layer spacing and charge imbalance between the layers.

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