Topological quantum phase transition in magnetic topological insulator upon magnetization rotation

Kawamura, Minoru; Mogi, Masataka; Yoshimi, Ryutaro; Tsukazaki, Atsushi; Kozuka, Y.; Takahashi, Kei; Kawasaki, Masashi; Tokura, Y.

doi:10.1103/physrevb.98.140404

Cited by 31 publications

(30 citation statements)

References 36 publications

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“…As a consequence, studying the unique interplay of topological phases with the dynamic magnetization of solids currently matures into a significant burgeoning research field of condensedmatter physics (see, e.g., Refs. [37][38][39][40][41][42]. In this context, for example, magnetic interfaces with topological insulators 43 and layered van der Waals crystals [44][45][46] , which can exhibit ferromagnetism at room temperature, constitute compelling and experimentally feasible classes of 2D quantum materials.…”

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confidence: 99%

Mixed topological semimetals driven by orbital complexity in two-dimensional ferromagnets

et al. 2019

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The concepts of Weyl fermions and topological semimetals emerging in three-dimensional momentum space are extensively explored owing to the vast variety of exotic properties that they give rise to. On the other hand, very little is known about semimetallic states emerging in two-dimensional magnetic materials, which present the foundation for both present and future information technology. Here, we demonstrate that including the magnetization direction into the topological analysis allows for a natural classification of topological semimetallic states that manifest in two-dimensional ferromagnets as a result of the interplay between spin-orbit and exchange interactions. We explore the emergence and stability of such mixed topological semimetals in realistic materials, and point out the perspectives of mixed topological states for current-induced orbital magnetism and current-induced domain wall motion. Our findings pave the way to understanding, engineering and utilizing topological semimetallic states in two-dimensional spin-orbit ferromagnets.

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confidence: 99%

Mixed topological semimetals driven by orbital complexity in two-dimensional ferromagnets

et al. 2019

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“…Спин электронов на поверхности жестко связан с их моментом, что обеспечивает поляризацию поверхностных состояний при переносе заряда [3]. Нарушение симметрии относительно обращения времени за счет приложения магнитного поля или легирования парамагнитными примесями открывает возможность контролировать транспортную спиновую поляризацию, а также наблюдать новые явления, такие как, например, топологический квантовый фазовый переход [4,5]. В связи с этим в последнее время активно исследуются ТИ, содержащие различные парамагнитные ионы, преимущественно ионы марганца, хрома, кобальта и железа.…”

Section: Introductionunclassified

Магнитные свойства топологического изолятора Bi-=SUB=-2-=/SUB=-Se-=SUB=-3-=/SUB=-, легированного железом

Shevchenko¹,

Хачатрян²,

Antonenko³

et al. 2019

Физика Твердого Тела

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We study the dc magnetization of a Bi_1.94Fe_0.06Se_3 single crystal in the temperature range of 1.9 to 400 K in applied magnetic fields up to 70 kOe for two sample orientations in the applied field. We register three magnetic phase transitions and observe considerable anisotropy of the magnetic properties. The coercive force varies with temperature in a nonmonotonic manner. For the sample in a paramagnetic state, we estimate its magnetic moment per iron atom; its Curie–Weiss temperature is found to be negative. Arrot–Belov plots are constructed.

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“…Experiments were conducted using an identical Hallbar sample [ Fig. 1(a)] to the previous study [19]. The Hall bar was made from a heterostructured film of (Bi,Sb) 2 Te 3 sandwiched by 2-nm-thick Cr-doped (Bi,Sb) 2 Te 3 grown on InP(111) substrate by molecular beam epitaxy (MBE) as schematically shown in Fig.…”

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confidence: 99%

“…The parametric plot of (σ xy , σ xx ) for various I in the inset of Fig. 3(a) shows a flow as similar to the temperature scaling flow [6,19,25]: (σ xx , σ xy ) tends to converge either (0, 0) or (e 2 /h, 0) with decreasing current with an unstable point at around (0.5 e 2 /h, 0.5 e 2 /h).…”

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Current scaling of the topological quantum phase transition between a quantum anomalous Hall insulator and a trivial insulator

et al. 2020

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We report a current scaling study of a quantum phase transition between a quantum anomalous Hall insulator and a trivial insulator on the surface of a heterostructure film of magnetic topological insulators. The transition was observed by tilting the magnetization while measuring the Hall conductivity σxy. The transition curves of σxy taken under various excitation currents cross each other at a single point, exemplifying a quantum critical behavior of the transition. The slopes of the transition curves follow a power law dependence of the excitation current, giving a scaling exponent. Combining with the result of the previous temperature scaling study, critical exponents ν for the localization length and p for the coherence length are separately evaluated as ν = 2.8 ± 0.3 and p = 3.3 ± 0.3.

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Topological quantum phase transition in magnetic topological insulator upon magnetization rotation

Cited by 31 publications

References 36 publications

Mixed topological semimetals driven by orbital complexity in two-dimensional ferromagnets

Mixed topological semimetals driven by orbital complexity in two-dimensional ferromagnets

Магнитные свойства топологического изолятора Bi-=SUB=-2-=/SUB=-Se-=SUB=-3-=/SUB=-, легированного железом

Current scaling of the topological quantum phase transition between a quantum anomalous Hall insulator and a trivial insulator

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