Tailoring tricolor structure of magnetic topological insulator for robust axion insulator
Masataka Mogi,Minoru Kawamura,Atsushi Tsukazaki,Ryutaro Yoshimi,Kei S. Takahashi,Masashi Kawasaki,Yoshinori Tokura +6 more
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TLDR
In this article, a tricolor topological insulator (TI) was designed to realize the TME effect as an axion insulator and the resistance reached as high as 109 ohms, leading to a gigantic magnetoresistance ratio exceeding 10,000,000% upon the transition from the QAH state.Abstract:
Exploration of novel electromagnetic phenomena is a subject of great interest in topological quantum materials. One of the unprecedented effects to be experimentally verified is the topological magnetoelectric (TME) effect originating from an unusual coupling of electric and magnetic fields in materials. A magnetic heterostructure of topological insulator (TI) hosts such exotic magnetoelectric coupling and can be expected to realize the TME effect as an axion insulator. We designed a magnetic TI with a tricolor structure where a nonmagnetic layer of (Bi, Sb)2Te3 is sandwiched by a soft ferromagnetic Cr-doped (Bi, Sb)2Te3 and a hard ferromagnetic V-doped (Bi, Sb)2Te3. Accompanied by the quantum anomalous Hall (QAH) effect, we observe zero Hall conductivity plateaus, which are a hallmark of the axion insulator state, in a wide range of magnetic fields between the coercive fields of Cr- and V-doped layers. The resistance of the axion insulator state reaches as high as 109 ohms, leading to a gigantic magnetoresistance ratio exceeding 10,000,000% upon the transition from the QAH state. The tricolor structure of the TI may not only be an ideal arena for the topologically distinct phenomena but can also provide magnetoresistive applications for advancing dissipation-less topological electronics.read more
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Journal ArticleDOI
Magnetic topological insulators
TL;DR: In this article, the basic concepts of magnetic topological insulators and their experimental realization, together with the discovery and verification of their emergent properties are summarized. And the development of tailored materials through heterostructure engineering has made it possible to access the quantum anomalous Hall effect, topological magnetoelectric effect, the physics related to the chiral edge states that appear in these materials and various spintronic phenomena.
Journal ArticleDOI
Robust axion insulator and Chern insulator phases in a two-dimensional antiferromagnetic topological insulator
Chang Liu,Yongchao Wang,Hao Li,Yang Wu,Yaoxin Li,Jiaheng Li,Ke He,Yong Xu,Jinsong Zhang,Yayu Wang +9 more
TL;DR: This work investigates the quantum transport of both bulk crystal and exfoliated MnBi 2 Te 4 flakes in a field-effect transistor geometry and observes a large longitudinal resistance and zero Hall plateau, which are characteristics of an axion insulator state.
Journal ArticleDOI
Unique Thickness-Dependent Properties of the van der Waals Interlayer Antiferromagnet MnBi2Te4 Films
Mikhail M. Otrokov,Igor P. Rusinov,Igor P. Rusinov,María Blanco-Rey,María Blanco-Rey,Michael J. Hoffmann,A. Yu. Vyazovskaya,A. Yu. Vyazovskaya,Sergey V. Eremeev,Sergey V. Eremeev,Sergey V. Eremeev,Arthur Ernst,Arthur Ernst,Pedro M. Echenique,Pedro M. Echenique,Pedro M. Echenique,Andrés Arnau,Andrés Arnau,Andrés Arnau,Evgueni V. Chulkov +19 more
TL;DR: MnBi_{2}Te_{4} is the first stoichiometric material predicted to realize the zero plateau quantum anomalous Hall state intrinsically and has been theoretically shown to host the exotic axion insulator phase.
Journal ArticleDOI
Intrinsic magnetic topological insulators in van der Waals layered MnBi2Te4-family materials
Jiaheng Li,Yang Li,Shiqiao Du,Zun Wang,Bing-Lin Gu,Shou-Cheng Zhang,Ke He,Wenhui Duan,Yong Xu,Yong Xu +9 more
TL;DR: In this article, the authors predict a series of van der Waals layered MnBi2Te4-related materials that show intralayer ferromagnetic and interlayer antiferromagnetic exchange interactions, including a topological axion state on the surface, a type II magnetic Weyl semimetal with one pair of Weyl points, as well as a collection of intrinsic axion insulators and quantum anomalous Hall (QAH) insulators in even and odd-layer films, respectively.
MonographDOI
Berry Phases in Electronic Structure Theory: Electric Polarization, Orbital Magnetization and Topological Insulators
TL;DR: In this paper, a pedagogical introduction to the important role of Berry phases and curvatures in the physics of electrons in solids is provided, including electric polarization, anomalous Hall conductivity, and the nature of the topological insulating state.
References
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Journal ArticleDOI
Giant magneto-optical Kerr effect and universal Faraday effect in thin-film topological insulators.
Wang-Kong Tse,Allan H. MacDonald +1 more
TL;DR: The magneto-optical Kerr and Faraday effects of a topological insulator thin film weakly exchange coupled to a ferromagnet are considered and it is found that its Faraday rotation has a universal value at low frequencies.
Journal ArticleDOI
Dynamical axion field in topological magnetic insulators
TL;DR: In this article, it was shown that magnetic fluctuations of topological insulators couple to the electromagnetic fields exactly like the axions, and proposed several experiments to detect this dynamical axion field.
Journal ArticleDOI
A magnetic heterostructure of topological insulators as a candidate for an axion insulator
Masataka Mogi,Minoru Kawamura,Ryutaro Yoshimi,Atsushi Tsukazaki,Yusuke Kozuka,N. Shirakawa,Kazuhiro Takahashi,Kazuhiro Takahashi,Masashi Kawasaki,Masashi Kawasaki,Yoshinori Tokura,Yoshinori Tokura +11 more
TL;DR: A TI heterostructure is engineered in which magnetic ions are modulation-doped only in the vicinity of the top and bottom surfaces of the TI ((Bi,Sb)2Te3) film, enabling the magnetization reversal of individual layers.
Journal ArticleDOI
Crossover of the three-dimensional topological insulator Bi2Se3 to the two-dimensional limit
Yi Zhang,Ke He,Cui-Zu Chang,Cui-Zu Chang,Can-Li Song,Lili Wang,Xi Chen,Jin-Feng Jia,Zhong Fang,Xi Dai,Wen-Yu Shan,Shun-Qing Shen,Qian Niu,Xiao-Liang Qi,Shou-Cheng Zhang,Xucun Ma,Qi-Kun Xue +16 more
TL;DR: In this paper, an angle-resolved photoemission spectroscopy was performed on Bi2Se3 films of various thicknesses grown by molecular beam epitaxy and the energy gap opening was clearly seen when the thickness is below six quintuple layers.
Journal ArticleDOI
Magnetic modulation doping in topological insulators toward higher-temperature quantum anomalous Hall effect
Masataka Mogi,Ryutaro Yoshimi,Atsushi Tsukazaki,Atsushi Tsukazaki,Kenji Yasuda,Yusuke Kozuka,Kei S. Takahashi,Masashi Kawasaki,Masashi Kawasaki,Yoshinori Tokura,Yoshinori Tokura +10 more
TL;DR: In this article, the authors proposed to use magnetic-Cr modulation doping into topological insulators (Bi,Sb)2Te3 films to increase the observable temperature of QAHE.