Topological charge-2 Dirac phonons in three dimensions: Theory and realization

Xu, Long; Liu, Ying; Zhang, Xiaoming; Liu, Guodong

doi:10.1103/physrevb.106.195142

Cited by 11 publications

(2 citation statements)

References 49 publications

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“…Up to now, various types of topological quasiparticles, such as Weyl [15][16][17], Dirac [18,19], nodal line [20][21][22], and nodal surface phonons [23][24][25], have been discovered in three dimensions (3D). Additionally, Weyl nodal points [26][27][28] and nodal lines [29,30] have been found in 2D systems.…”

Section: Introductionmentioning

confidence: 99%

Two-dimensional Dirac phonons without/with inversion symmetry

Wang

Liu

et al. 2023

J. Phys.: Condens. Matter

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In a recent study, two-dimensional Dirac phonons that are protected by nonsymmorphic symmetries in spinless systems were systematically investigated. However, the focus of this study was on the classification of Dirac phonons. To address the gap in the research on the topological features of 2D Dirac phonons based on their effective models, we classified the 2D Dirac phonons into two classes: without or with inversion symmetry, thereby clarifying the minimal symmetry requirements for enforcing 2D Dirac points. Based on symmetry analysis, we discovered that screw symmetries, together with time-reversal symmetry, play an essential role in the existence of Dirac points. To validate this result, we constructed the k·p model to describe the Dirac phonons and discussed their topological features accordingly. We found that a 2D Dirac point could be considered as a composition of two 2D Weyl points with opposite chirality. Furthermore, we provided two concrete materials to demonstrate our findings. Overall, our work provides a more detailed study of 2D Dirac points in spinless systems and clarifies their topological features.

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Section: Introductionmentioning

confidence: 99%

Two-dimensional Dirac phonons without/with inversion symmetry

Wang

Liu

et al. 2023

J. Phys.: Condens. Matter

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“…The combination of half-metallicity and topological states has attracted increasing research interest recently. In such topological half-metals, many outstanding characteristics such as high electron mobility, topological stability of bands, and spin-polarized surface states can be expected [19][20][21][22][23][24][25][26][27]. These characteristics make topological half-metals potential applications in the emerging electron spin technology, which has been in full swing in recent years, using electron spins as a medium for data storage and transmission [28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Two-dimensional half-metallicity and fully spin-polarized topological fermions in monolayer EuOBr

et al. 2023

J. Phys.: Condens. Matter

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Two-dimensional (2D) half-metallicity and topological states of matter have been the current research focus in condensed matter physics. Herein, we report a novel 2D material named EuOBr monolayer, which can simultaneously show 2D half-metallicity and topological fermions. The material features conducting electronic states in the spin-up channel but a large insulating gap of 4.38 eV in the spin-down channel. In the conducting spin channel, the EuOBr monolayer shows the coexistence of Weyl points and nodal lines near the Fermi energy. The nodal lines in the material contain rich categories including type-I, hybrid, closed, and open nodal lines. The symmetry analysis suggests these nodal lines are protected by the horizontal mirror symmetry, which cannot be broken even spin-orbit coupling (SOC) is included because the ground magnetization direction in the material is out-of-plane [001]. The topological fermions in the EuOBr monolayer are fully spin-polarized, which can be meaningful for future applications in topological spintronic nano-devices.

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Topological nodal-point phononic systems

Yang,

Wang,

et al. 2024

Matter

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Topological charge-2 Dirac phonons in three dimensions: Theory and realization

Cited by 11 publications

References 49 publications

Two-dimensional Dirac phonons without/with inversion symmetry

Two-dimensional Dirac phonons without/with inversion symmetry

Two-dimensional half-metallicity and fully spin-polarized topological fermions in monolayer EuOBr

Topological nodal-point phononic systems

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