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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Observation of Magnetism-Induced Topological Edge State in Antiferromagnetic Topological Insulator MnBi4Te7.
Hao-Ke Xu,Mingqiang Gu,Fucong Fei,Yilun Gu,Da Liu,Qiaolin Yu,Shangjie Xue,Xu-Hui Ning,Bo Chen,Hangkai Xie,Zhen Zhu,Dandan Guan,Shiyong Wang,Yaoyi Li,Canhua Liu,Qihang Liu,Fengqi Song,Hao Zheng,Jinfeng Jia +18 more
TL;DR: In this paper , an axion insulator theory was proposed to explain the topological nature of the observed edge states of a magnetism-induced edge state in a topological topological insulator, which is composed of an alternatively stacked magnetic layer and a nonmagnetic layer.
Journal ArticleDOI
Large dynamical axion field in topological antiferromagnetic insulator Mn$_2$Bi$_2$Te$_5$
TL;DR: In this article, a series of van der Waal layered topological antiferromagnetic materials could host the long-sought dynamical axion field with a topological origin.
Posted Content
Crossover of Quantum Anomalous Hall to Topological Hall Effect in Magnetic Topological Insulator Sandwich Heterostructures
Jue Jiang,Di Xiao,Fei Wang,Jaeho Shin,Domenico Andreoli,Jianxiao Zhang,Run Xiao,Yifan Zhao,Morteza Kayyalha,Ling Zhang,Ke Wang,Jiadong Zang,Chao-Xing Liu,Nitin Samarth,Moses H. W. Chan,Cui-Zu Chang +15 more
TL;DR: In this paper, by inserting a TI layer between two magnetic TI layers to form a sandwich heterostructure, the authors observed the crossover from the intrinsic anomalous Hall (AH) to the topological Hall (TH) effect through tuning the chemical potential.
Journal ArticleDOI
Glassy magnetic ground state in layered compound MnSb2Te4
TL;DR: In this paper, single-crystal X-ray diffraction (SCXRD) analysis on MnSb2Te4 illustrates a crystal model that is isostructural to MnBi2Te 4.
Journal ArticleDOI
Side-surface-mediated hybridization in axion insulators
Rui Chen,Haibo Sun,Bing Zhou +2 more
TL;DR: In this paper , the authors proposed a mechanism to explain why the half quantization is hard to be probed by showing that the half-quantized counterpropagating currents in axion insulator thin films are strongly suppressed due to the hybridization mediated by the massless side-surface states.
References
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Journal ArticleDOI
Revival of the Magnetoelectric Effect
Abstract: Recent research activities on the linear magnetoelectric (ME) effect?induction of magnetization by an electric field or of polarization by a magnetic field?are reviewed. Beginning with a brief summary of the history of the ME effect since its prediction in 1894, the paper focuses on the present revival of the effect. Two major sources for 'large' ME effects are identified. (i) In composite materials the ME effect is generated as a product property of a magnetostrictive and a piezoelectric compound. A linear ME polarization is induced by a weak ac magnetic field oscillating in the presence of a strong dc bias field. The ME effect is large if the ME coefficient coupling the magnetic and electric fields is large. Experiments on sintered granular composites and on laminated layers of the constituents as well as theories on the interaction between the constituents are described. In the vicinity of electromechanical resonances a ME voltage coefficient of up to 90?V?cm?1?Oe?1 is achieved, which exceeds the ME response of single-phase compounds by 3?5 orders of magnitude. Microwave devices, sensors, transducers and heterogeneous read/write devices are among the suggested technical implementations of the composite ME effect. (ii) In multiferroics the internal magnetic and/or electric fields are enhanced by the presence of multiple long-range ordering. The ME effect is strong enough to trigger magnetic or electrical phase transitions. ME effects in multiferroics are thus 'large' if the corresponding contribution to the free energy is large. Clamped ME switching of electrical and magnetic domains, ferroelectric reorientation induced by applied magnetic fields and induction of ferromagnetic ordering in applied electric fields were observed. Mechanisms favouring multiferroicity are summarized, and multiferroics in reduced dimensions are discussed. In addition to composites and multiferroics, novel and exotic manifestations of ME behaviour are investigated. This includes (i) optical second harmonic generation as a tool to study magnetic, electrical and ME properties in one setup and with access to domain structures; (ii) ME effects in colossal magnetoresistive manganites, superconductors and phosphates of the LiMPO4 type; (iii) the concept of the toroidal moment as manifestation of a ME dipole moment; (iv) pronounced ME effects in photonic crystals with a possibility of electromagnetic unidirectionality. The review concludes with a summary and an outlook to the future development of magnetoelectrics research.
Journal ArticleDOI
Topological semimetal and Fermi-arc surface states in the electronic structure of pyrochlore iridates
Xiangang Wan,Ari M. Turner,Ashvin Vishwanath,Ashvin Vishwanath,Sergey Y. Savrasov,Sergey Y. Savrasov +5 more
TL;DR: In this paper, the topological semimetal, a three-dimensional phase of a magnetic solid, is described and it may be realized in a class of pyrochlore iridates based on calculations using the LDA+U$ method.