Direct Visualization of Surface Spin-Flip Transition in 
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Ge, Wenbo; Kim, Jinwoong; Chan, Ying-Ting; Vanderbilt, David; Yan, Jiaqiang; Wu, Weida

doi:10.1103/physrevlett.129.107204

Phys. Rev. Lett.

2022

DOI: 10.1103/physrevlett.129.107204

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Direct Visualization of Surface Spin-Flip Transition in MnBi4Te7

Wenbo Ge

Jinwoong Kim

Ying-Ting Chan

et al.

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Cited by 10 publications

(1 citation statement)

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“…The numerical simulations show that CES can be spatially shifted in a disordered Chern insulator with multistep potential, by tuning the Fermi energy. [62] Interestingly, the chiral DW has been experimentally observed in antiferromagnetic topological insulators MnBi2Te4 and MnBi4Te7, which could hold QAH or axion insulator state, [63,64] and the existence of CES along chiral DW associated with nontrivial transport phenomena is further theoretically proposed based on layered MnBi2Te4. [65,66] In summary, we have presented a general approach of manipulation QAH effects and revealed its possibility in 2D magnets, VSe2 and Fe2𝑋I (𝑋 = Cl, Br), with robust noncollinear magnetic order and high QAH temperatures.…”

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confidence: 93%

Quantum Anomalous Hall Effects Controlled by Chiral Domain Walls

Cui

Liang

Zhu

et al. 2023

Chinese Phys. Lett.

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We report the interplay between two different topological phases in condensed matter physics, the magnetic chiral domain wall (DW) and the quantum anomalous Hall (QAH) effect. We show that the chiral DW driven by Dzyaloshinskii–Moriya interaction (DMI) can divide the uniform domain into several zones where the neighboring zone possesses opposite quantized Hall conductance. The separated domain with a chiral edge state (CES) can be continuously modified by external magnetic field-induced domain expansion and thermal fluctuation, which gives rise to the reconfigurable QAH effect. More interestingly, we show that the position of CES can be tuned by spin current driven chiral DW motion. Several two-dimensional magnets with high Curie temperature and large topological band gaps are proposed for realizing these phenomena. Our work thus reveals the possibility of chiral DW controllable QAH effects.

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confidence: 93%

Quantum Anomalous Hall Effects Controlled by Chiral Domain Walls

Cui

Liang

Zhu

et al. 2023

Chinese Phys. Lett.

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Real‐Space Imaging of Intrinsic Symmetry‐Breaking Spin Textures in a Kagome Lattice

Xie,

Deng,

Zhang

et al. 2024

Advanced Science

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The electronic orders in kagome materials have emerged as a fertile platform for studying exotic quantum states, and their intertwining with the unique kagome lattice geometry remains elusive. While various unconventional charge orders with broken symmetry is observed, the influence of kagome symmetry on magnetic order has so far not been directly observed. Here, using a high‐resolution magnetic force microscopy, it is, for the first time, observed a new lattice form of noncollinear spin textures in the kagome ferromagnet in zero magnetic field. Under the influence of the sixfold rotational symmetry of the kagome lattice, the spin textures are hexagonal in shape and can further form a honeycomb lattice structure. Subsequent thermal cycling measurements reveal that these spin textures transform into a non‐uniform in‐plane ferromagnetic ground state at low temperatures and can fully rebuild at elevated temperatures, showing a strong second‐order phase transition feature. Moreover, some out‐of‐plane magnetic moments persist at low temperatures, supporting the Kane–Mele scenario in explaining the emergence of the Dirac gap. The observations establish that the electronic properties, including both charge and spin orders, are strongly coupled with the kagome lattices.

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Layer-by-layer disentanglement of Bloch states

et al. 2023

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Direct Visualization of Surface Spin-Flip Transition in MnBi4Te7

Cited by 10 publications

References 36 publications

Quantum Anomalous Hall Effects Controlled by Chiral Domain Walls

Quantum Anomalous Hall Effects Controlled by Chiral Domain Walls

Real‐Space Imaging of Intrinsic Symmetry‐Breaking Spin Textures in a Kagome Lattice

Layer-by-layer disentanglement of Bloch states

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