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arXiv 2103.01919cond-mat.str-elcond-mat.mes-hall
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蜂窝反铁磁体中非共线磁序的铰链磁振子

Hinge Magnons from Non-collinear Magnetic Order in Honeycomb Antiferromagnet

Moon Jip Park, SungBin Lee, Yong Baek Kim

摘要:

我们提出量子磁体中的非共线磁序可以包含一种新的高阶拓扑磁振子相,它具有非厄米拓扑和铰链磁振子模。本文考虑了蜂窝格子上相互作用的局部矩三维系统。它最初有利于沿面内方向的共线磁序,当施加垂直于易磁化轴的外部磁场时,其转变为非共线磁序。我们利用磁振子哈密顿量的非厄米性质表明,这种场诱导的转变对应于从拓扑磁振子绝缘体到具有一维铰链模式的高阶拓扑磁振子态的转变。作为一个具体的例子,我们讨论了最近发现的单斜相薄三卤化铬,我们提出的第一个有前途的材料候选人的高阶拓扑磁振子相。

英文摘要:

We propose that non-collinear magnetic order in quantum magnets can harbor a novel higher-order topological magnon phase with non-Hermitian topology and hinge magnon modes. We consider a three-dimensional system of interacting local moments on stacked-layers of honeycomb lattice. It initially favors a collinear magnetic order along an in-plane direction, which turns into a non-collinear order upon applying an external magnetic field perpendicular to the easy axis. We exploit the non-Hermitian nature of the magnon Hamiltonian to show that this field-induced transition corresponds to the transformation from a topological magnon insulator to a higher-order topological magnon state with a one-dimensional hinge mode. As a concrete example, we discuss the recently-discovered monoclinic phase of the thin chromium trihalides, which we propose as the first promising material candidate of the higher-order topological magnon phase.

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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