Optical probe of Heisenberg-Kitaev magnetism in α-RuCl3

被引：45
|
作者：
Sandilands, Luke J. [1 ,2 ]
Sohn, C. H. [1 ,2 ]
Park, H. J. [1 ,2 ]
Kim, So Yeun [1 ,2 ]
Kim, K. W. [3 ]
Sears, Jennifer A. [4 ,5 ]
Kim, Young-June [4 ,5 ]
Noh, Tae Won [1 ,2 ]
机构：
[1] Inst for Basic Sci Korea, Ctr Correlated Electron Syst, Seoul 08826, South Korea
[2] Seoul Natl Univ, Dept Phys & Astron, Seoul 08826, South Korea
[3] Chungbuk Natl Univ, Dept Phys, Cheongju 28644, Chungbuk, South Korea
[4] Univ Toronto, Dept Phys, Toronto, ON M5S 1A7, Canada
[5] Univ Toronto, Ctr Quantum Mat, Toronto, ON M5S 1A7, Canada
来源：
PHYSICAL REVIEW B | 2016年 / 94卷 / 19期
基金：
新加坡国家研究基金会; 加拿大自然科学与工程研究理事会;
关键词：
TEMPERATURE-DEPENDENCE;
D O I：
10.1103/PhysRevB.94.195156
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We report a temperature-dependent optical spectroscopic study of the Heisenberg-Kitaev magnet alpha-RuCl3. Our measurements reveal anomalies in the optical response near the magnetic ordering temperature. At higher temperatures, we observe a redistribution of spectral weight over a broad energy range that is associated with nearest-neighbor spin-spin correlations. This finding is consistent with highly frustrated magnetic interactions and in agreement with theoretical expectations for this class of material. The optical data also reveal significant electron-hole interaction effects, including a bound excitonic state. These results demonstrate a clear coupling between charge and spin degrees of freedom and provide insight into the properties of thermally disordered Heisenberg-Kitaev magnets.
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收藏
页数：7
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