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Electronic properties of a quantum ring perturbed with a quantum well in the presence of perpendicular magnetic flux

机译：存在垂直磁通量时被量子阱扰动的量子环的电子性质

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摘要

Here, we study the effects of the number of sites, quantum ring radius and potential well depth on the energy levels, persistent current, magnetic susceptibility and density of states (DOS) of a quantum ring with a quantum well within its circumstance in a magnetic flux perpendicular to its plane. We show that, for small radius quantum ring systems, there are periodic local gaps along the magnetic flux axis in the DOS plots and along the axis 'energy'. For large radius quantum ring systems, a uniform gap along the energy axis exists and along the phi axis nothing changes. In quantum rings with a quantum well in their circumstance, by using the large confining potential, we can create uniform gaps in the Energy-phi plane. The energy eigenvalues, persistent current and magnetic susceptibility decrease by increasing the confining potential. A quantum ring even with a very small confining potential in its circumstance can sensibly decrease the persistent current and magnetic susceptibility, although it may do not change the energy eigenvalues and DOS maximum considerably. Thus, by using the abovementioned parameters, we are able to tune the DOS, persistent current, magnetic susceptibility and energy levels, desirably.
机译：在这里，我们研究了具有量子阱的量子环在磁环境中的能级数，量子环半径和势阱深度对能级，持续电流，磁化率和状态密度（DOS）的影响。垂直于其平面的磁通。我们表明，对于小半径量子环系统，在DOS图中沿磁通量轴和沿“能量”轴存在周期性的局部间隙。对于大半径的量子环系统，沿着能量轴存在均匀的间隙，而沿着phi轴则没有任何变化。在具有量子阱的情况下的量子环中，通过使用大的约束势，我们可以在Energy-phi平面中创建均匀的间隙。能量特征值，持续电流和磁化率通过增加限制电位而降低。尽管量子环可能不会显着改变能量本征值和DOS最大值，但即使在这种情况下具有极小的封闭势，它也可以显着降低持久电流和磁化率。因此，通过使用上述参数，我们能够理想地调整DOS，持续电流，磁化率和能级。

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