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arXiv 1503.09186cond-mat.mes-hall
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多边形量子环的电子局域化和光吸收

Electron localization and optical absorption of polygonal quantum rings

Anna Sitek, Llorenç Serra, Vidar Gudmundsson, Andrei Manolescu

摘要:

我们从理论上研究多边形量子环,主要集中在三角形几何的角效应是最大的。这种环可以被看作是短的核壳纳米线,这是具有多种应用的半导体异质结构的一代。我们展示了样品的几何形状如何决定电子能谱,以及电子的局部化,对光吸收的影响。特别是,我们表明,无论环形低能量电子总是被吸引的角落,并在其附近的本地化。在存在磁场的情况下的吸收光谱示出了在角定域状态域内的仅两个峰,每个峰与不同的圆偏振相关联。该图像可以通过外部电场来改变,该外部电场允许先前禁止的转变,并且因此使得能够确定角的数量。我们表明,多边形量子环允许吸收波从遥远的范围内的电磁波谱在一个样品。

英文摘要:

We investigate theoretically polygonal quantum rings and focus mostly on the triangular geometry where the corner effects are maximal. Such rings can be seen as short core-shell nanowires, a generation of semiconductor heterostructures with multiple applications. We show how the geometry of the sample determines the electronic energy spectrum, and also the localization of electrons, with effects on the optical absorption. In particular, we show that irrespective of the ring shape low-energy electrons are always attracted by corners and are localized in their vicinity. The absorption spectrum in the presence of a magnetic field shows only two peaks within the corner-localized state domain, each associated with different circular polarization. This picture may be changed by an external electric field which allows previously forbidden transitions, and thus enables the number of corners to be determined. We show that polygonal quantum rings allow absorption of waves from distant ranges of the electromagnetic spectrum within one sample.

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