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arXiv 2207.04745cond-mat.mes-hallcond-mat.mtrl-sci
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二维量子磁体中磁振子拓扑的直接光学探测

Direct optical probe of magnon topology in two-dimensional quantum magnets

Emil Viñas Boström, Tahereh Sadat Parvini, James W. McIver, Angel Rubio, Silvia Viola Kusminskiy, Michael A. Sentef

摘要:

控制拓扑磁振子绝缘体的边缘态是获得稳定自旋电子学器件的一条很有前途的途径。然而,通过实验确定磁振子带的拓扑结构是一项具有挑战性的任务。本文导出了光-物质耦合与磁振子量子几何之间的基本关系。这使得可以建立双磁振子拉曼圆二色性作为蜂窝磁铁中磁振子拓扑结构的光学探针,特别是陈数和拓扑间隙。我们的结果为在功能量子器件中实现光与拓扑磁振子的相互作用铺平了道路。

英文摘要:

Controlling edge states of topological magnon insulators is a promising route to stable spintronics devices. However, to experimentally ascertain the topology of magnon bands is a challenging task. Here we derive a fundamental relation between the light-matter coupling and the quantum geometry of magnon states. This allows to establish the two-magnon Raman circular dichroism as an optical probe of magnon topology in honeycomb magnets, in particular of the Chern number and the topological gap. Our results pave the way for interfacing light and topological magnons in functional quantum devices.

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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