scholarly journals Fully spin-polarized quadratic non-Dirac bands realized quantum anomalous Hall effect

2020 ◽  
Vol 22 (2) ◽  
pp. 549-555 ◽  
Author(s):  
Ping Li ◽  
Tian-Yi Cai
Keyword(s):  
Magnetic Field ◽  
Hall Effect ◽  
Quantum State ◽  
Anomalous Hall Effect ◽  
Edge States ◽  
Quantum Anomalous Hall Effect ◽  
Spin Polarized

The quantum anomalous Hall effect is an intriguing quantum state that exhibits chiral edge states in the absence of a magnetic field.

scholarly journals Half-Dirac Semimetal and Quantum Anomalous Hall Effect in Kagome Cd2N3 Lattice

2020 ◽  
Author(s):  
Xinyang Li ◽  
Weixiao Ji ◽  
Peiji Wang ◽  
Chang-wen Zhang
Keyword(s):  
Hall Effect ◽  
Quantum State ◽  
Anomalous Hall Effect ◽  
Topological Phases ◽  
Dirac Semimetal ◽  
Quantum Anomalous Hall Effect ◽  
Dirac Materials ◽  
Low Dimensionality ◽  
Dirac Semimetals ◽  
Topological Phases Of Matter

Half-Dirac semimetals (HDSs), which possess 100% spin-polarizations for Dirac materials, are highly desirable for exploring various topological phases of matter, as low-dimensionality opens unprecedented opportunities for manipulating the quantum state...

scholarly journals Quantum anomalous Hall effect

2013 ◽  
Vol 1 (1) ◽  
pp. 38-48 ◽  
Author(s):  
Ke He ◽  
Yayu Wang ◽  
Qi-Kun Xue
Keyword(s):  
Magnetic Field ◽  
Hall Effect ◽  
Quantum Hall Effect ◽  
Condensed Matter ◽  
Semiconductor Industry ◽  
Quantum Hall ◽  
Special Kind ◽  
Anomalous Hall Effect ◽  
Electronic Systems ◽  
Quantum Anomalous Hall Effect

Abstract Hall effect is a well-known electromagnetic phenomenon that has been widely applied in the semiconductor industry. The quantum Hall effect discovered in two-dimensional electronic systems under a strong magnetic field provided new insights into condensed matter physics, especially the topological aspect of electronic states. The quantum anomalous Hall effect is a special kind of the quantum Hall effect that occurs without a magnetic field. It has long been sought after because its realization will significantly facilitate the studies and applications of the quantum Hall physics. In this paper, we review how the idea of the quantum anomalous Hall effect was developed and how the effect was finally experimentally realized in thin films of a magnetically doped topological insulator.

Ferromagnetic dual topological insulator in a two-dimensional honeycomb lattice

2020 ◽  
Vol 7 (9) ◽  
pp. 2431-2438
Author(s):  
Hao Wang ◽  
Ning Mao ◽  
Chengwang Niu ◽  
Shiying Shen ◽  
Myung-Hwan Whangbo ◽  
...  
Keyword(s):  
Hall Effect ◽  
Topological Insulator ◽  
Topological Insulators ◽  
Anomalous Hall Effect ◽  
Topological Invariant ◽  
Honeycomb Lattice ◽  
Two Dimensional ◽  
Edge States ◽  
Quantum Anomalous Hall Effect ◽  
Significant Attention

Magnetic topological insulators (TIs), including the quantum anomalous Hall effect and antiferromagnetic TIs, have attracted significant attention owing to the exotic properties they give rise to, however, ferromagnetic TIs with gapless surface/edge states and a nonzero topological invariant have not been reported so far.

scholarly journals Topological Phase and Quantum Anomalous Hall Effect in Ferromagnetic Transition-Metal Dichalcogenides Monolayer 1T-VSe2

Nanomaterials ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1998
Author(s):  
Angus Huang ◽  
Chin-Hsuan Chen ◽  
Ching-Hao Chang ◽  
Horng-Tay Jeng
Keyword(s):  
Transition Metal ◽  
Hall Effect ◽  
Transition Metal Dichalcogenides ◽  
Anomalous Hall Effect ◽  
Ferromagnetic Transition ◽  
Spin Orbit Coupling ◽  
Edge States ◽  
Quantum Anomalous Hall Effect ◽  
Metal Dichalcogenides ◽  
Crossing Point

Magnetic two-dimensional (2D) van der Waals materials have attracted tremendous attention because of their high potential in spintronics. In particular, the quantum anomalous Hall (QAH) effect in magnetic 2D layers shows a very promising prospect for hosting Majorana zero modes at the topologically protected edge states in proximity to superconductors. However, the QAH effect has not yet been experimentally realized in monolayer systems to date. In this work, we study the electronic structures and topological properties of the 2D ferromagnetic transition-metal dichalcogenides (TMD) monolayer 1T−VSe2 by first-principles calculations with the Heyd–Scuseria–Ernzerhof (HSE) functional. We find that the spin-orbit coupling (SOC) opens a continuous band gap at the magnetic Weyl-like crossing point hosting the quantum anomalous Hall effect with Chern number C=2. Moreover, we demonstrate the topologically protected edge states and intrinsic (spin) Hall conductivity in this magnetic 2D TMD system. Our results indicate that 1T−VSe2 monolayer serves as a stoichiometric quantum anomalous Hall material.

scholarly journals The family of topological Hall effects for electrons in skyrmion crystals

2018 ◽  
Vol 91 (8) ◽  
Author(s):  
Börge Göbel ◽  
Alexander Mook ◽  
Jürgen Henk ◽  
Ingrid Mertig
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Hall Effect ◽  
Electron Spin ◽  
Anomalous Hall Effect ◽  
Transverse Spin ◽  
Edge States ◽  
Finite Sample ◽  
Magnetic Texture ◽  
Hall Effects

Abstract Hall effects of electrons can be produced by an external magnetic field, spin–orbit coupling or a topologically non-trivial spin texture. The topological Hall effect (THE) – caused by the latter – is commonly observed in magnetic skyrmion crystals. Here, we show analogies of the THE to the conventional Hall effect (HE), the anomalous Hall effect (AHE), and the spin Hall effect (SHE). In the limit of strong coupling between conduction electron spins and the local magnetic texture the THE can be described by means of a fictitious, “emergent” magnetic field. In this sense the THE can be mapped onto the HE caused by an external magnetic field. Due to complete alignment of electron spin and magnetic texture, the transverse charge conductivity is linked to a transverse spin conductivity. They are disconnected for weak coupling of electron spin and magnetic texture; the THE is then related to the AHE. The topological equivalent to the SHE can be found in antiferromagnetic skyrmion crystals. We substantiate our claims by calculations of the edge states for a finite sample. These states reveal in which situation the topological analogue to a quantized HE, quantized AHE, and quantized SHE can be found.

scholarly journals Quantum spin–quantum anomalous Hall effect with tunable edge states in Sb monolayer-based heterostructures

2016 ◽  
Vol 94 (23) ◽  
Author(s):  
Tong Zhou ◽  
Jiayong Zhang ◽  
Yang Xue ◽  
Bao Zhao ◽  
Huisheng Zhang ◽  
...  
Keyword(s):  
Hall Effect ◽  
Anomalous Hall Effect ◽  
Quantum Spin ◽  
Edge States ◽  
Quantum Anomalous Hall Effect ◽  
Spin Quantum

scholarly journals Quantum anomalous Hall effect in a stable 1T-YN2monolayer with a large nontrivial bandgap and a high Chern number

Nanoscale ◽  
2018 ◽  
Vol 10 (17) ◽  
pp. 8153-8161 ◽  
Author(s):  
Xiangru Kong ◽  
Linyang Li ◽  
Ortwin Leenaerts ◽  
Weiyang Wang ◽  
Xiong-Jun Liu ◽  
...  
Keyword(s):  
Hall Effect ◽  
Anomalous Hall Effect ◽  
Chern Number ◽  
Edge States ◽  
Quantum Anomalous Hall Effect

Three chiral edge states related to a high Chern number.

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