Intrinsic magnetic topological insulators

Wang, Pinyuan; Ge, Jun‐Yi; Zhang, Yingbo; Liu, Yanzhao; Xu, Yong; Wang, Jian

doi:10.1016/j.xinn.2021.100098

Cited by 76 publications

(48 citation statements)

References 105 publications

(404 reference statements)

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“…Very recently, antiferromagnetic domains as well as the A-type antiferromagnetic order were imaged in MnBi 2 Te 4 and Mn(Bi,Sb) 2 Te 4 bulk crystals by magnetic force microscopy (Sass et al, 2020a,b). More focused reviews of the MnBi 2 Te 4 family of compounds can be found in Ning and Mao, 2020;Wang et al, 2021;and Zhao and Liu, 2021.…”

Section: Mnbi2te4: An Intrinsic Magnetic Ti a Materials Propertiesmentioning

confidence: 99%

Colloquium: Quantum anomalous Hall effect

Chang¹,

Liu²,

MacDonald³

2022

Preprint

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The quantum Hall (QH) effect, quantized Hall resistance combined with zero longitudinal resistance, is the characteristic experimental fingerprint of Chern insulators -topologically non-trivial states of two-dimensional matter with broken time-reversal symmetry. In Chern insulators, non-trivial bulk band topology is expressed by chiral states that carry current along sample edges without dissipation. The quantum anomalous Hall (QAH) effect refers to QH effects that occur in the absence of external magnetic fields due to spontaneously broken time-reversal symmetry. The QAH effect has now been realized in four different classes of two-dimensional materials: (i) thin films of magnetically (Cr-and/or V-) doped topological insulator (Bi,Sb) 2 Te 3 family, (ii) thin films of the intrinsic magnetic topological insulator MnBi 2 Te 4 , (iii) moiré materials formed from graphene, and (iv ) moiré materials formed from transition metal dichalcogenides. In this Article, we review the physical mechanisms responsible for each class of QAH insulator, highlighting both differences and commonalities, and comment on potential applications of the QAH effect.

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Section: Mnbi2te4: An Intrinsic Magnetic Ti a Materials Propertiesmentioning

confidence: 99%

Colloquium: Quantum anomalous Hall effect

Chang¹,

Liu²,

MacDonald³

2022

Preprint

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“…The protected surface state of topological insulator fits into this role for its long enough mean free path and lifetime and also for excluding the insulating and spin-degenerate bulk influence [13][14][15]. Tunable exchange gap from controlling magnetic doping further allows for demonstrating both massless and massive Dirac physics [16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Nonequilibrium topological spin textures in momentum space

Zhang,

Nagaosa

2022

Preprint

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Nonequilibrium quantum dynamics of many-body systems is the frontier of condensed matter physics; recent advances in various time-resolved spectroscopic techniques continue to reveal rich phenomena. Angle-resolved photoemission spectroscopy (ARPES) as one powerful technique can resolve electronic energy, momentum, and spin along the time axis after excitation. However, dynamics of spin textures in momentum space remains mostly unexplored. Here we demonstrate theoretically that the photoexcited surface state of genuine or magnetically doped topological insulators shows novel topological spin textures, i.e., tornado-like patterns, in the spin-resolved ARPES. We systematically reveal its origin as a unique nonequilibrium photoinduced topological winding phenomenon. As all intrinsic and extrinsic topological helicity factors of both material and light are embedded in a robust and delicate manner, the tornado patterns not only allow a remarkable tomography of these important system information, but also enable various unique dichroic topological switchings of the momentum-space spin texture. These results open a new direction of nonequilibrium topological spin states in quantum materials.

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“…The realization of magnetic TIs has become recently the focus of intense research [10][11][12] with various candidates appearing in the literature [13][14][15][16][17][18][19][20][21]. The most prominent, MnBi 2 Te 4 [13,14], is a layered tetradymite compound with an A-type antiferromagnetic (AFM) order, i.e., with magnetization uniform in-plane but alternating from plane to plane along the stacking direction.…”

Section: Introductionmentioning

confidence: 99%

Engineering magnetic topological insulators in Eu$_5M_2X_6$ Zintls

Varnava,

Berry,

McQueen

et al. 2022

Preprint

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Magnetic topological insulator provide a prominent material platform for quantum anomalous Hall physics and axion electrodynamics. However, the lack of material realizations with cleanly gapped surfaces hinders technological utilization of these exotic quantum phenomena. Here, using the Zintl concept and the properties of non-symmorphic space groups, we computationally engineer magnetic topological insulators. Specifically, we explore Eu5M2X6 (M =metal, X =pnictide) Zintl compounds and find that Eu5Ga2Sb6, Eu5Tl2Sb6 and Eu5In2Bi6 form stable structures with nontrivial Z2 indices. We also show that epitaxial and uniaxial strain can be used to control the Z2 index and the bulk energy gap. Finally, we discuss experimental progress towards the synthesis of the proposed candidates and provide insights that can be used in the search for robust magnetic topological insulators in Zintl compounds.

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Intrinsic magnetic topological insulators

Cited by 76 publications

References 105 publications

Colloquium: Quantum anomalous Hall effect

Colloquium: Quantum anomalous Hall effect

Nonequilibrium topological spin textures in momentum space

Engineering magnetic topological insulators in Eu$_5M_2X_6$ Zintls

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