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.

引用

页数：7

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