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arXiv 2003.12791cond-mat.mtrl-scicond-mat.mes-hallquant-ph
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二维铁磁双层膜中的谷极化畴壁磁振子

Valley-polarized domain wall magnons in 2D ferromagnetic bilayers

Doried Ghader

摘要:

Valleytronics是一个开创性的技术领域,依靠谷自由度来实现新颖的电子功能。基于谷电子学中的电势,对双层石墨烯中局限于畴壁的拓扑谷极化电子进行了广泛的研究。在这里,我们研究磁振版本的畴壁激发在二维蜂窝铁磁双层膜(FBL)共线秩序。特别是,我们探讨的影响Dzyaloshinskiii-Moriya相互作用(ESTA)和静电掺杂(ED)的存在和特性的一维磁振子局限于层堆叠畴壁FBL。研究发现,电畴和电畴的共存丰富了FBL中的拓扑结构,但相应的畴壁磁振子并没有明确的谷指数。另一方面,我们表明,层堆叠畴壁在DMI自由FBL构成一维通道的弹道输运的拓扑谷极化磁振子。我们的理论结果为基于原子级薄拓扑磁性材料的磁振子谷电子器件的发展带来了希望。

英文摘要:

Valleytronics is a pioneering technological field relying on the valley degree of freedom to achieve novel electronic functionalities. Topological valley-polarized electrons confined to domain walls in bilayer graphene were extensively studied in view of their potentials in valleytronics. Here, we study the magnonic version of domain wall excitations in 2D honeycomb ferromagnetic bilayers (FBL) with collinear order. In particular, we explore the implications of Dzyaloshinskii-Moriya interaction (DMI) and electrostatic doping (ED) on the existence and characteristics of 1D magnons confined to layer stacking domain walls in FBL. The coexistence of DMI and ED is found to enrich the topology in FBL, yet the corresponding domain wall magnons do not carry a well-defined valley index. On the other hand, we show that layer stacking domain walls in DMI-free FBL constitute 1D channels for ballistic transport of topological valley-polarized magnons. Our theoretical results raise hope towards magnon valleytronic devices based on atomically thin topological magnetic materials.

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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