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Topological magnons in CrI 3 monolayers: an itinerant fermion description
2D Materials ( IF 5.5 ) Pub Date : 2020-09-21 , DOI: 10.1088/2053-1583/aba88f
N M R Peres 1, 2 , J Fernndez-Rossier 1
Affiliation  

Magnons dominate the magnetic response of ferromagnetic two-dimensional crystals such as CrI 3 . Because of the arrangement of Cr spins in a honeycomb lattice, magnons in CrI 3 bear a strong resemblance with electrons in graphene. Neutron scattering experiments carried out in bulk CrI 3 show the existence of a gap at the Dirac points, conjectured to have a topological nature. We propose a theory for magnons in CrI 3 monolayers based on an itinerant fermion picture, with a Hamiltonian derived from first principles. We obtain the magnon dispersion for 2D CrI 3 with a gap at the Dirac points with the same Berry curvature in both valleys. For CrI 3 ribbons, we find chiral in-gap edge states. Analysis of the magnon wave functions in momentum space confirms their topological nature. Importantly, our approach does not require a spin Hamiltonian, and can be applied to insulating and conducting 2D materials with any type of magnet...

中文翻译:

CrI 3单层中的拓扑磁振子:流动费米子描述

磁振子支配诸如CrI 3的铁磁二维晶体的磁响应。由于Cr自旋在蜂窝晶格中的排列,因此CrI 3中的磁振子与石墨烯中的电子非常相似。在块状CrI 3中进行的中子散射实验表明,在Dirac点上存在间隙,推测是具有拓扑性质的。我们提出了一个基于流动费米子图片的CrI 3单层中的磁振子理论,该理论具有从第一原理导出的哈密顿量。我们获得了二维CrI 3的磁振弥散,在两个谷中,狄拉克点处的间隙具有相同的贝里曲率。对于CrI 3色带,我们发现手性间隙内边缘状态。对动量空间中的马农波函数的分析证实了它们的拓扑性质。重要的是,我们的方法不需要自旋哈密顿量,
更新日期:2020-09-22
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