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arXiv 2004.14179cond-mat.mes-hallcond-mat.str-el
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具有离面磁化的二维晶体中的非互易磁振子

Non-reciprocal magnons in a two dimensional crystal with off-plane magnetization

M. J. T. Costa, J. Fernández-Rossier, N. M. R. Peres, A. T. Costa

摘要:

非互易自旋波具有手征不对称性,使得它们的能量对于两个相反的波矢量是不同的。他们被发现在原子薄的铁磁覆盖层与平面磁化,并与反对称Dzyaloshinskiii-Moriya表面交换。我们利用基于第一性原理计算的巡游费米子理论预言了第一个具有离面磁化的独立金属二维晶体Fe $_3$ GeTe $_2$中存在非互易磁振子.我们发现,磁振子的能量和寿命都是非互易的,我们预测,声学磁振子的寿命可以达到数百皮秒,比其他导电磁体大几个数量级。

英文摘要:

Non reciprocal spin waves have a chiral asymmetry so that their energy is different for two opposite wave vectors. They are found in atomically thin ferromagnetic overlayers with in plane magnetization and are linked to the anti-symmetric Dzyaloshinskii-Moriya surface exchange. We use an itinerant fermion theory based on first principles calculations to predict that non-reciprocal magnons can occur in Fe$_3$GeTe$_2$, the first stand alone metallic two dimensional crystal with off-plane magnetization. We find that both the energy and lifetime of magnons are non-reciprocal and we predict that acoustic magnons can have lifetimes up to hundreds of picoseconds, orders of magnitude larger than in other conducting magnets.

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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