耦合Aharonov-Bohm环中的受控电子输运
Controlled electron transport in coupled Aharonov-Bohm rings
摘要：
我们提出了一个简单的模型，两个耦合介观环线程的磁通量，模仿一个设备的电子传输控制的方式。在紧束缚的形式主义，我们工作的条件下，完全弹道传输时，可以触发在费米能级的任何所需的位置在一个连续的能量范围内。通过适当地调节通过两个环的磁通量的值，可以容易地控制开关动作。整个环系统的一般传输显示有趣的功能，其特征在于Fano共振的出现和崩溃，并在几种情况下的Aharonov-Bohm振荡的抑制。我们报告和分析了一些这样的情况下，精确的分析结果。
英文摘要：
We propose a simple model of two coupled mesoscopic rings threaded by magnetic flux which mimics a device for electron transmission in a controlled fashion. Within a tight binding formalism we work out exactly the conditions when a completely ballistic transmission can be triggered at any desired position of the Fermi level within a continuous range of energy. The switching action can be easily controlled by appropriately tuning the values of the flux through the two rings. The general transmission across the ring system displays interesting features characterized by the appearance and collapse of Fano resonances, and the suppression of the Aharonov-Bohm oscillations in several cases. We report and analyze exact analytical results for a few such cases.
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