Terahertz spectroscopy on Faraday and Kerr rotations in a quantum anomalous Hall state

被引：145

作者：

Okada, Ken N. ^{[1
,2
,3
]}

Takahashi, Youtarou ^{[1
,2
,3
,4
]}

Mogi, Masataka ^{[1
,2
,3
]}

Yoshimi, Ryutaro ^{[1
,2
,3
]}

Tsukazaki, Atsushi ^{[1
,4
,5
]}

Takahashi, Kei S. ^{[1
,4
]}

Ogawa, Naoki ^{[1
]}

Kawasaki, Masashi ^{[1
,2
,3
]}

Tokura, Yoshinori ^{[1
,2
,3
]}

机构：

[1] RIKEN, CEMS, Wako, Saitama 3510198, Japan

[2] Univ Tokyo, Dept Appl Phys, Tokyo 1138656, Japan

[3] Univ Tokyo, QPEC, Tokyo 1138656, Japan

[4] Japan Sci & Technol Agcy JST, PRESTO, Chiyoda Ku, Tokyo 1020075, Japan

[5] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan

来源：

NATURE COMMUNICATIONS | 2016年 / 7卷

基金：

日本学术振兴会;

关键词：

FERROMAGNETIC TOPOLOGICAL INSULATOR;

D O I：

10.1038/ncomms12245

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Electrodynamic responses from three-dimensional topological insulators are characterized by the universal magnetoelectric term constituent of the Lagrangian formalism. The quantized magnetoelectric coupling, which is generally referred to as topological magnetoelectric effect, has been predicted to induce exotic phenomena including the universal low-energy magneto-optical effects. Here we report the experimental indication of the topological magnetoelectric effect, which is exemplified by magneto-optical Faraday and Kerr rotations in the quantum anomalous Hall states of magnetic topological insulator surfaces by terahertz magneto-optics. The universal relation composed of the observed Faraday and Kerr rotation angles but not of any material parameters (for example, dielectric constant and magnetic susceptibility) well exhibits the trajectory towards the fine structure constant in the quantized limit.

引用

页数：6

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