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首页> 外文期刊>Physica, B. Condensed Matter >Electron correlations in quasi-2D structures at high magnetic fields in the presence of embedded donor impurities
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Electron correlations in quasi-2D structures at high magnetic fields in the presence of embedded donor impurities

机译：存在嵌入供体杂质的高磁场下准二维结构中的电子相关性

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Systematic far infrared (FIR) magneto-spectroscopic studies have been carried out on a series of GaAs / AlGaAs multiple quantum well (QW) structures, delta-doped with Si donors in both well and barrier centers. Filling-factor (nu)-dependent energy blueshifts of the many-electron singlet-like transition have been observed in the integer and fractional Quantum Hall regime. For all samples studied the blueshift of this transition decreases with increasing B for nu < 1, while the many-electron triplet-like transition simultaneously loses strength. This high-field behavior of the many-electron system, i.e. appearing to approach a collection of isolated two-electron negatively-charged donor (D-) ions, is understood in the context of exact diagonalization studies of a donor and confined electrons. Our results show that FIR magneto-optical excitations of the system depend sensitively on the microscopic electron configuration in the vicinity of the positive donor ions due to electron correlations and localization at high magnetic fields. (C) 1998 Elsevier Science B.V. All rights reserved. [References: 23]
机译：对一系列GaAs / AlGaAs多量子阱（QW）结构进行了系统远红外（FIR）磁光谱研究，这些结构在阱中心和势垒中心均掺有Si供体。在整数和分数量子霍尔态中已观察到多电子单重态跃迁的依赖于填充因子（nu）的能量蓝移。对于所有研究的样品，当nu <1时，该跃迁的蓝移随B的增加而减小，而类似多电子三重态的跃迁同时失去强度。在对给体和受限电子进行精确对角化研究的背景下，可以理解多电子系统的这种高场行为，即似乎接近隔离的两个电子带负电的给体（D-）离子的集合。我们的结果表明，由于电子相关性和在高磁场中的局限性，系统的FIR磁光激发敏感地取决于正给体离子附近的微观电子构型。 （C）1998 Elsevier Science B.V.保留所有权利。 [参考：23]

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