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arXiv 1606.07072cond-mat.mes-hall
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边缘赝磁等离子体

Edge pseudo-magnetoplasmons

Alessandro Principi, Mikhail I. Katsnelson, Giovanni Vignale

摘要:

我们研究了赝磁场存在下双组分电子液体中的边缘等离子体激元的性质,赝磁场对于两种不同的电子布居具有相反的符号,因此保持了时间反演对称性。这种系统的物理实现有很多。我们讨论的情况下,应变石墨烯和电子接近Skyrmion晶格,解决问题的维纳-霍普夫技术。我们表明:(i),两个带电的反向传播的声学边缘模式存在于边界处,(ii),在大的伪磁场的限制,他们每个人都只涉及两个电子组件之一的振荡。我们认为,边缘的伪磁等离子体的石墨烯可以用来选择性地解决一个特定的谷,一个功能相关的新兴领域的valleytronics的电子。相反,在Skyrmion晶格的边界处的自旋极化等离子体激元可以用于自旋电子学应用。我们的解决方案突出了在以前的(类似的)结果与不受控制的近似,即对数发散的等离子体激元速度,和无间隙的边缘模式内的散装等离子体激元间隙丢失的新功能。

英文摘要:

We study the properties of edge plasmons in two-component electron liquids in the presence of pseudomagnetic fields, which have opposite signs for the two different electronic populations and therefore preserve the time-reversal symmetry. The physical realizations of such systems are many. We discuss the cases of strained graphene and of electrons in proximity to a Skyrmion lattice, solving the problem with the Wiener-Hopf technique. We show (i) that two charged counter-propagating acoustic edge modes exist at the boundary and (ii) that, in the limit of large pseudomagnetic fields, each of them involves oscillations of only one of the two electronic components. We suggest that the edge pseudo-magnetoplasmons of graphene can be used to selectively address the electrons of one specific valley, a feature relevant for the emerging field of valleytronics. Conversely, the spin-polarized plasmons at the boundary of Skyrmion lattices can be exploited for spintronics applications. Our solution highlights new features missing in previous (similar) results obtained with uncontrolled approximations, namely a logarithmic divergence of the plasmon velocity, and the absence of gapped edge modes inside the bulk-plasmon gap.

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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