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arXiv 1003.1245cond-mat.mes-hall
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磁场中猝灭的AlGaAs-GaAs量子阱结构的磁电阻慢弛豫

Slow relaxations of magnetoresistance in AlGaAs-GaAs quantum well structures quenched in a magnetic field

N. V. Agrinskaya, V. I. Kozub, D. V. Shamshur, A. V. Shumilin, Y. M. Galperin

摘要:

我们观察到在选择性掺杂的p型GaAs-AlGaAs结构中,当外加磁场作用下,上Hubbard带部分填充时,磁电阻会发生缓慢的弛豫。我们特别注意排除与温度波动有关的影响。虽然这种效应很重要,但我们发现缓慢弛豫的一般特征仍然存在。这种行为被解释为与库仑玻璃的性质有关,库仑玻璃由带电中心形成,并考虑到自旋相关性,这是敏感的外部磁场。磁场的变化改变了不同类型的杂质复合物的数量。因此,它的影响的形状和深度的极化子间隙形成的状态属于负责电导的渗流集团。该模型解释了缓慢弛豫磁电阻的定性行为和数量级。

英文摘要:

We observed a slow relaxation of magnetoresistance in response to applied magnetic field in selectively doped p-GaAs-AlGaAs structures with partially filled upper Hubbard band. We have paid a special attention to exclude the effects related to temperature fluctuations. Though this effect is important, we have found that the general features of slow relaxation still persist. This behavior is interpreted as related to the properties of the Coulomb glass formed by charged centers with account of spin correlations, which are sensitive to an external magnetic field. Variation of the magnetic field changes numbers of impurity complexes of different types. As a result, it effects the shape and depth of the polaron gap formed at the states belonging to the percolation cluster responsible for the conductance. The suggested model explains both the qualitative behavior and the order of magnitude of the slowly relaxing magnetoresistance.

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