双同心量子环中的电子局域化
Electron localizations in double concentric quantum ring
摘要：
研究了在垂直磁场作用下双同心量子环中电子的局域化。在弱耦合DCQR中，当与不同环相关联的单电子能级可能交叉时，可能发生这种情况。为了避免简并，这些能级的反交叉占有一席之地。我们表明，在这个DCQR环之间的电子空间跃迁发生由于电子能级反交叉。不同径向量子数能级的反交叉为环间电子隧穿提供了条件。为了研究半导体DCQR的电子结构，采用了考虑能量依赖性的单子带有效质量方法。给出了与实验中制备的DCQR几何形状相关的DCQR电子跃迁的数值模拟结果。
英文摘要：
We investigate the electron localization in double concentric quantum rings (DCQRs) when a perpendicular magnetic field is applied. In weakly coupled DCQRs, the situation can occur when the single electron energy levels associated with different rings may be crossed. To avoid degeneracy, the anti-crossing of these levels has a place. We show that in this DCQR the electron spatial transition between the rings occurs due to the electron level anti-crossing. The anti-crossing of the levels with different radial quantum numbers provides the conditions for electron tunneling between rings. To study electronic structure of the semiconductor DCQR, the single sub-band effective mass approach with energy dependence was used. Results of numerical simulation for the electron transition are presented for DCQRs of geometry related to one fabricated in experiment.
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