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arXiv 1812.09239cond-mat.mes-hall
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立方共线反铁磁体中的磁振子

Magnon-polarons in cubic collinear Antiferromagnets

Haakon T. Simensen, Roberto E. Troncoso, Akashdeep Kamra, Arne Brataas

摘要:

本文对反铁磁体中磁振子与声子-磁振子-极化子杂化所形成的激发态进行了理论研究。我们首先概述了一个一般的方法来确定哪些磁振子和声子模式可以和不能杂交的系统,从而解决有关磁振子极化子形成的定性问题。作为一个具体的和实验相关的情况下,我们研究了氧化镍定量和定性分析发现完美的协议,从而突出了前者的实力。我们发现反铁磁磁振子极化子有两个不同于铁磁磁振子的显著特征。首先,在许多立方反铁磁结构中,期望磁振子和纵向声子模式之间的杂化。第二,我们发现某些杂化的存在可以通过外部磁场来控制,这种效应是除了相对于声子模式移动磁振子模式的能力之外的。

英文摘要:

We present a theoretical study of excitations formed by hybridization between magnons and phonons - magnon-polarons - in antiferromagnets. We first outline a general approach to determining which magnon and phonon modes can and cannot hybridize in a system thereby addressing the qualitative questions concerning magnon-polaron formation. As a specific and experimentally relevant case, we study Nickel Oxide quantitatively and find perfect agreement with the qualitative analysis, thereby highlighting the strength of the former. We find that there are two distinct features of antiferromagnetic magnon-polarons which differ from the ferromagnetic ones. First, hybridization between magnons and the longitudinal phonon modes is expected in many cubic antiferromagnetic structures. Second, we find that the very existence of certain hybridizations can be controlled via an external magnetic field, an effect which comes in addition to the ability to move the magnon modes relative to the phonons modes.

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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