Weyl Fermions in VI3 Monolayer

Jia, Taoyuan; Meng, Weizhen; Zhang, Haopeng; Liu, Chunhai; Dai, Xuefang; Zhang, Xiaoming; Liu, Guodong

doi:10.3389/fchem.2020.00722

Cited by 11 publications

(7 citation statements)

References 49 publications

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“…Particularly, around this isolated nodal point, the quasiparticle acts similarly to the behavior of Weyl fermions, which are particles of considerable interest in high-energy physics. We summarize some recent studies on Weyl materials as follows: (i) Zhao and Ma (2020) stated that hexagonal MnO ferromagnet is a magnetic Weyl semimetal with spin-gapless state; (ii) Meng W. et al (2020b) predicted that HfCuP compound is a newly designed Weyl semimetal with different types of Weyl nodes; and (iii) Jia et al (2020) reported that the VI 3 monolayer hosts a Weyl fermion and 100% spin-polarization. Furthermore, under the protection from certain crystalline symmetries, two Weyl points of opposite chirality can be stable at the same point, forming a Dirac point.…”

Section: Introductionmentioning

confidence: 98%

“…The dimensionality of band-crossings is a criterion used to classify topological semimetals/metals. The most famous topological semimetals/metals with zero-dimensional band-crossings, i.e., zero-dimensional nodal points, are Dirac semimetals/metals (Chen et al, 2015(Chen et al, , 2020Bradlyn et al, 2017;Zhong et al, 2017;Jing and Heine, 2018;Liu et al, 2018b;Zhang et al, 2018b;Khoury et al, 2019;Wang et al, 2020f;Xu et al, 2020) and Weyl semimetals/metals (Peng et al, 2016;Lin et al, 2017;Fu et al, 2018;Zhang et al, 2018c;Zhou et al, 2019;Gupta et al, 2020;Jia et al, 2020;Liu et al, 2020;Meng L. et al, 2020;Zhao B. et al, 2020). We selected Weyl semimetals/metals as examples here because there exists a band-crossing of the valance band and conduction band at an isolated nodal point in the momentum space of these solids.…”

Section: Introductionmentioning

confidence: 99%

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Hexagonal Zr3X (X = Al, Ga, In) Metals: High Dynamic Stability, Nodal Loop, and Perfect Nodal Surface States

Gao

2020

Front. Chem.

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In recent years, topological semimetals/metals, including nodal point, nodal line, and nodal surface semimetals/metals, have been studied extensively because of their potential applications in spintronics and quantum computers. In this study, we predict a family of materials, Zr 3 X (X = Al, Ga, In), hosting the nodal loop and nodal surface states in the absence of spin-orbit coupling. Remarkably, the energy variation of the nodal loop and nodal surface states in Zr 3 X are very small, and these topological signatures lie very close to the Fermi level. When the effect of spin-orbit coupling is considered, the nodal loop and nodal surface states exhibit small energy gaps (<25 and 35 meV, respectively) that are suitable observables that reflect the spin-orbit coupling response of these topological signatures and can be detected in experiments. Moreover, these compounds are dynamically stable, and they consequently form potential material platforms to study nodal loop and nodal surface semimetals.

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Hexagonal Zr3X (X = Al, Ga, In) Metals: High Dynamic Stability, Nodal Loop, and Perfect Nodal Surface States

Gao

2020

Front. Chem.

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“…Accordingly, the DOS peaks of V

orbitals are pushed away from the Fermi level, resulting in the enhanced magnetic moment of 1.1

per V ion. A remarkable emerging feature is the band crossing at the M point by two spin up single bands at the energy of

eV as highlighted by the green circle in Figure 1 c. Some of the previous works have named such crossings in 2D systems as Weyl points [ 36 , 37 , 38 ], even though the Weyl point was originally defined in three-dimensional materials [ 39 ]. In this work, following previous works, we hereafter call this band crossing as the Weyl point.…”

Section: Resultsmentioning

confidence: 99%

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

et al. 2021

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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.

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“…[33,34] To date, the Weyl states in most of reported 2D half-metals may belong to type I. The novel type-II Weyl fermions are found in only a few half-metal compounds, including Cr 2 C, [20] VI 3 , [35] and CrN [30] monolayers (MLs). However, they are all hypothetical structures and have not yet been synthesized experimentally.…”

Section: Introductionmentioning

confidence: 99%

MnNBr Monolayer: A High‐Temperature Ferromagnetic Half‐Metal with Type‐II Weyl Fermions

Shi

Cui

Song

et al. 2021

Physica Rapid Research Ltrs

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For spintronics, it is highly desirable to obtain stable low‐dimensional materials with ferromagnetic ground state, 100% spin polarization, and high Curie temperature. Moreover, type‐II Weyl fermions are also desired for realizing high‐speed anisotropic transport. Herein, based on first‐principles calculations, the orthorhombic MnNBr monolayer is identified as a needed ferromagnetic half‐metal, which not only has a high Curie temperature (910 K), but also holds type‐II Weyl state with Lorentz symmetry broken. Analysis of the stability reveals that the MnNBr monolayer is energetically, mechanically, dynamically, and thermally stable. Remarkably, in the vicinity of the Fermi level there exist both type‐I and titled type‐II Weyl states, whose nodes form continuously distributed Weyl loops. Under intrinsic out‐of‐plane magnetization, they are robust against spin–orbital coupling due to the protection of glide mirror symmetry. Moreover, near the type‐II Weyl point, there is direction‐dependent band dispersion: the largest fermion velocities can be found in the k path of G–X (up to 6.86 × 105 m s−1), while quasi‐flat bands with negligible band dispersion can be found along the direction being parallel to G–Y. This indicates that MnNBr monolayer should be a promising candidate for further applications of high‐speed anisotropic transport and studies of strongly correlated electronic states.

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Weyl Fermions in VI3 Monolayer

Cited by 11 publications

References 49 publications

Hexagonal Zr3X (X = Al, Ga, In) Metals: High Dynamic Stability, Nodal Loop, and Perfect Nodal Surface States

Hexagonal Zr3X (X = Al, Ga, In) Metals: High Dynamic Stability, Nodal Loop, and Perfect Nodal Surface States

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

MnNBr Monolayer: A High‐Temperature Ferromagnetic Half‐Metal with Type‐II Weyl Fermions

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