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arXiv 1601.06217cond-mat.mes-hall
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磁边磁等离子体激元的空间色散:半无限门效应

Spatial dispersion of magnetic-edge magnetoplasmons: Effect of semi-infinite gate

Oleg G. Balev, Ivan A. Larkin

摘要:

在强垂直磁场作用下,研究了顶部为半无限金属栅、距离为$d$、顶部为半无限铁磁薄膜的二维电子系统(2DES)的磁边磁等离子体激元(MEMPs).对于两个最快的MEMPs,一个具有正手性,另一个具有负手性,一个强大的空间色散,由于金属半平面栅极的影响,得到的;一些较慢的MEMPs表现出空间色散。目前的微机电脉冲都集中在靠近金属半平面栅楔的磁边缘处,金属楔的存在增强了微机电脉冲在磁边缘处的局部化。得到的空间色散具有非常规形式。特别地,对于两个最快的MEMP,相速度$ω/k_{x}$是长波长区域中的波矢量$k_{x}$上的线性多项式,$k_{x}d \ll 1$。对于$0<k_{x}d \leq1$,得到了铁磁薄膜磁滞对MEMPs相速度及其反交叉的强烈影响。具有相反手性的两个MEMS,特别是两个最快的MEMS,在某个谐振频率下可以产生谐振电路,其具有沿着磁边缘周长的一部分的闭合波路径,其中波相位的总变化由整数$2π$给出。

英文摘要:

Magnetic-edge magnetoplasmons (MEMPs) are obtained for a two-dimensional electron system (2DES) with atop semi-infinite metallic gate, at a distance $d$, and atop semi-infinite ferromagnetic film at a strong perpendicular magnetic field. For two most fast MEMPs, one with positive chirality and other with negative chirality, a strong spatial dispersion, due to effect of metallic half-plane gate, is obtained; some slower MEMPs manifest spatial dispersion too. Present MEMPs are localized at the magnetic-edge that is close to the wedge of metallic half-plane gate; the metallic wedge enhances localization of MEMPs at magnetic-edge. Obtained spatial dispersion has unconventional form. In particular, for two most fast MEMPs the phase velocities, $ω/k_{x}$, are the linear polynomials on the wave vector $k_{x}$ in the long-wavelength region, $k_{x}d \ll 1$. Strong effect of the ferromagnetic film hysteresis on the MEMPs phase velocities and their anti-crossings are obtained for $0<k_{x}d \leq1$. Two MEMPs of opposite chirality, especially two most fast MEMPs, at some resonance frequency can create a resonance circuit, with closed wave path along a fraction of the magnetic edge perimeter, with a total change of the wave phase given by an integer of $2π$.

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