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arXiv 1004.2196cond-mat.mes-hall
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三端半导体量子环中的磁力和定态电子流

Magnetic forces and stationary electron flow in three-terminal semiconductor quantum ring

M. R. Poniedzialek, B. Szafran

摘要:

我们研究了三端量子环中的稳态电子流,并描述了经典磁力对电子轨道偏转的影响。我们证明,一般在高磁场($B$)的电流是由磁力引导遵循经典的路径,其中$B>0$导致通过环的左臂的左输出端子。对于磁场的窄窗口,到左输出端子的传输被阻挡,对于该窄窗口,环内的干扰导致形成仅弱耦合到输出通道波函数的波函数。这些干扰条件伴随着电流注入到环的右臂,以及出现转移概率的尖峰到右输出端子。我们发现,这些峰在高磁场的衰减的热加宽的运输窗口。我们还表明,干涉条件,导致其外观消失时,环内的弹性散射存在。磁力对转移概率的明显影响消失,随着Aharonov-Bohm振荡在一个混乱的运输制度,发现环的宽度大于宽度的通道。

英文摘要:

We study stationary electron flow through a three-terminal quantum ring and describe effects due to deflection of electron trajectories by classical magnetic forces. We demonstrate that generally at high magnetic field ($B$) the current is guided by magnetic forces to follow a classical path which for $B>0$ leads via the left arm of the ring to the left output terminal. The transport to the left output terminal is blocked for narrow windows of magnetic field for which the interference within the ring leads to formation of wave functions that are only weakly coupled to the output channel wave functions. These interference conditions are accompanied by injection of the current to the right arm of the ring and by appearance of sharp peaks of the transfer probability to the right output terminal. We find that these peaks at high magnetic field are attenuated by thermal widening of the transport window. We also demonstrate that the interference conditions that lead to their appearance vanish when an elastic scattering within the ring is present. The clear effect of magnetic forces on the transfer probabilities disappears along with Aharonov-Bohm oscillations in a chaotic transport regime that is found for rings whose width is larger than the width of the channels.

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