多电子量子环中的Aharonov-Bohm效应
Aharonov-Bohm effect in many-electron quantum rings
摘要：
利用含时密度泛函理论研究了磁场中二维单端量子环中的Aharonov-Bohm效应。我们发现多个传输回路导致h/（en）的振荡周期，其中n是回路的数量。我们发现Aharonov-Bohm振荡受电子-电子相互作用的影响相对较弱，而环的宽度对振荡的特性有很强的影响。我们的研究结果表明，在实验量子环器件显示明确的Aharonov-Bohm振荡的电子电流是由几个国家沿狭窄的传导通道。
英文摘要：
The Aharonov-Bohm effect is investigated in two-dimensional, single-terminal quantum rings in magnetic fields by using time-dependent density-functional theory. We find multiple transport loops leading to the oscillation periods of h/(en), where n is the number of loops. We show that the Aharonov-Bohm oscillations are relatively weakly affected by the electron-electron interactions, whereas the ring width has a strong effect on the characteristics of the oscillations. Our results propose that in experimental quantum-ring devices showing clear Aharonov-Bohm oscillations the electron current is dominated by a few states along narrow conduction channels.
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