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arXiv 1909.01574cond-mat.mes-hallcond-mat.other
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自旋-轨道耦合纳米线中局域猝灭引起的相干电荷和自旋振荡

Coherent charge and spin oscillations induced by local quenches in nanowires with spin-orbit coupling

F. Cavaliere, N. Traverso Ziani, F. Dolcini, M. Sassetti, F. Rossi

摘要:

当纳米线中的局部吸引势被猝灭时,光谱的拓扑结构从纯连续谱变为连续谱和离散部分。我们表明,在适当的条件下,这种淬火导致稳定的相干振荡的可观的时间演化。特别是,我们证明了弹道纳米线与自旋轨道耦合(SOC)暴露在一个均匀的磁场是特别适合观察这种效果。实际上,在普通纳米线中,只有当吸引势的强度$U_0$足够强时才发生该效应,而在SOC纳米线中,即使$U_0$的弱值也是足够的。此外,在这些系统中,自旋扇区中的相干振荡可以通过猝灭作用在电荷扇区上的栅极电压来产生和电控制。我们解释了这种现象的起源,分析了化学势的变化和淬灭吸引势的切换时间的影响,并解决可能的实施方案。

英文摘要:

When a local and attractive potential is quenched in a nanowire, the spectrum changes its topology from a purely continuum to a continuum and discrete portion. We show that, under appropriate conditions, this quench leads to stable coherent oscillations in the observables time evolution. In particular, we demonstrate that ballistic nanowires with spin-orbit coupling (SOC) exposed to a uniform magnetic field are especially suitable to observe this effect. Indeed, while in ordinary nanowires the effect occurs only if the strength $U_0$ of the attractive potential is sufficiently strong, even a weak value of $U_0$ is sufficient in SOC nanowires. Furthermore, in these systems coherent oscillations in the spin sector can be generated and controlled electrically by quenching the gate voltage acting on the charge sector. We interpret the origin of this phenomenon, analyze the effect of variation of the chemical potential and the switching time of the quenched attractive potential, and address possible implementation schemes.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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