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arXiv 0805.4489cond-mat.mes-hall
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自旋轨道耦合二维电子气中的波包动力学:分裂和zitterbewegung

Wave packet dynamics in 2DEG with spin orbit coupling: splitting and zitterbewegung

V. Ya. Demikhovskii, G. M. Maksimova, E. V. Frolova

摘要:

研究了Rashba自旋轨道耦合作用下半导体量子阱中一维和二维电子波包的分裂和齐特波楔效应。我们的研究结果表明,自旋轨道相互作用导致自旋极化波包的演化发生了质的变化。初始波包分裂成两部分,具有不同的自旋极化,以不相等的群速度传播。这种分裂出现是由于存在两个分支的电子光谱对应的定态具有不同的手征。还证明了在垂直于电子气平面的外磁场B$存在下,波包分裂成两部分,它们以不同的回旋频率旋转。结果表明,经过一段时间后,电子密度沿回旋轨道分布,运动呈现出不规则性。我们的计算是针对弱和强自旋轨道耦合的两种情况进行的。

英文摘要:

We study the effect of splitting and zitterbewegung of 1D and 2D electron wave packets in the semiconductor quantum well under the influence of the Rashba spin orbit coupling. Results of our investigations show that the spin orbit interaction induces dramatic qualitative changes in the evolution of spin polarized wave packet. The initial wave packet splits into two parts with different spin polarization propagating with unequal group velocity. This splitting appears due to the presence of two branches of electron spectrum corresponding to the stationary states with different chirality. It is demonstrated also that in the presence of external magnetic field B$ perpendicular to the electron gas plane the wave packet splits into two parts which rotates with different cyclotron frequencies. It was shown that after some periods the electron density distributes around cyclotron orbit and the motion acquire an irregular character. Our calculations were made for both cases of weak and strong spin orbit coupling.

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