Mirror-symmetric Magneto-optical Kerr Rotation using Visible Light in [(GeTe)2(Sb2Te3)1]n Topological Superlattices

被引：52

作者：

Bang, Do ^{[1
]}

Awano, Hiroyuki ^{[1
]}

Tominaga, Junji ^{[2
]}

Kolobov, Alexander V. ^{[2
]}

Fons, Paul ^{[2
]}

Saito, Yuta ^{[2
]}

Makino, Kotaro ^{[2
]}

Nakano, Takashi ^{[2
]}

Hase, Muneaki ^{[3
]}

Takagaki, Yukihiko ^{[4
]}

Giussani, Alessandro ^{[4
]}

Calarco, Raffaella ^{[4
]}

Murakami, Shuichi ^{[5
]}

机构：

[1] Toyota Technol Inst, Informat Storage Mat Lab, Nagoya, Aichi 468, Japan

[2] Natl Inst Adv Ind Sci & Technol, Nanoelect Res Inst, Tsukuba, Ibaraki, Japan

[3] Univ Tsukuba, Fac Pure & Appl Sci, Tsukuba, Ibaraki, Japan

[4] Paul Drude Inst Festkorperelekt, D-10117 Berlin, Germany

[5] Tokyo Inst Technol, TIES, Dept Phys, Tokyo 152, Japan

来源：

SCIENTIFIC REPORTS | 2014年 / 4卷

关键词：

SINGLE DIRAC CONE; INSULATOR; SURFACE; STATE;

D O I：

10.1038/srep05727

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：

Interfacial phase change memory (iPCM), that has a structure of a superlattice made of alternating atomically thin GeTe and Sb2Te3 layers, has recently attracted attention not only due to its superior performance compared to the alloy of the same average composition in terms of energy consumption but also due to its strong response to an external magnetic field (giant magnetoresistance) that has been speculated to arise from switching between topological insulator (RESET) and normal insulator (SET) phases. Here we report magneto-optical Kerr rotation loops in the visible range, that have mirror symmetric resonances with respect to the magnetic field polarity at temperatures above 380 K when the material is in the SET phase that has Kramers-pairs in spin-split bands. We further found that this threshold temperature may be controlled if the sample was cooled in a magnetic field. The observed results open new possibilities for use of iPCM beyond phase-change memory applications.

引用

页数：7

共 37 条

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