Spin-orbit coupling and linear crossings of dipolar magnons in van der Waals antiferromagnets

Liu, Jie; Wang, Lin; Shen, Ka

doi:10.1103/physrevb.102.144416

Cited by 8 publications

(4 citation statements)

References 28 publications

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“…[55] In 2015, Lee et al introduced PT-symmetry into magnetic nanostructures with balanced magnetic gain and loss, which ini-tiated the research of PT-symmetry in magnetism. [19] Considering a magnetic system with two layers of ferromagnetic films coupled by dipole-dipole interaction, [56][57][58] as shown in Figure 2a.…”

Section: Theoretical Research Progress In Pt-symmetric Magnetic Nanom...mentioning

confidence: 99%

Parity‐Time Symmetry in Magnetic Materials and Devices

Zhang,

Xin,

Liu

2023

Adv Elect Materials

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Non‐Hermitian Hamiltonians may still possess real eigenvalues in case of the existence of parity‐time (PT) symmetry. Exceptional points (EPs) occur at the phase transition from real to complex eigenvalues due to PT‐symmetry breaking in the parameter space. Magnonic devices use magnons to carry, transport, and process information, which have the advantages of low energy dissipation, wave‐based computing, and nonlinear data processing. The combination of PT‐symmetry and magnonics may lead to novel physics as well as unprecedented functional device applications. Recently, the research of PT‐symmetry in magnetism has developed rapidly. In this review, the theoretical predictions as well as experimental findings of PT‐symmetry in magnetism are summarized. First, a brief introduction to PT symmetry, EPs, and anti‐PT symmetry is presented. Second, the theoretical and experimental progress of magnonic PT symmetry are summarized. Third, the theoretical predictions of higher‐order EPs and anti‐PT symmetry in magnonic systems are given. Finally, the study concludes by discussing the future challenges and research prospects in magnonic PT‐symmetry, and proposals for experimental observations of magnonic higher‐order EPs and anti‐PT symmetry are suggested.

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Section: Theoretical Research Progress In Pt-symmetric Magnetic Nanom...mentioning

confidence: 99%

Parity‐Time Symmetry in Magnetic Materials and Devices

Zhang,

Xin,

Liu

2023

Adv Elect Materials

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“…The spin-orbit coupling is at the origin of the antisymmetric Dzyaloshinskii-Moriya (DM) interaction in magnetic crystals [12] which induces the magnon-Hall effect observed in ferromagnetic insulators [13,14]. Recently, it was proposed that dipolar interactions have a similar effect as the DM interaction [15,16] which paves the way for the realisation of topological artificial nano-structures [17,18]. Dipolar interactions are always present in magnetic solids.…”

Section: Introductionmentioning

confidence: 99%

Dipolar spin-waves and tunable band gap at the Dirac points in the 2D magnet ErBr3

Wessler,

Roessli,

Krämer

et al. 2022

Preprint

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Topological magnon insulators constitute a growing field of research for their potential use as information carriers without heat dissipation. We report an experimental and theoretical study of the magnetic ground-state and excitations in the van der Waals two-dimensional honeycomb magnet ErBr 3 . We show that the magnetic properties of this compound are entirely governed by the dipolar interactions which generate a continuously degenerate non-collinear ground-state on the honeycomb lattice with spins confined in the plane. We find that the magnon dispersion exhibits Dirac-like cones when the magnetic moments in the ground-state are related by timereversal and inversion symmetries associated with a Berry phase π as in single-layer graphene. A magnon band gap opens when the dipoles are rotated away from this state, entailing a finite Berry curvature in the vicinity of the K and K' Dirac points.Our results illustrate that the spin-wave dispersion of dipoles on the honeycomb lattice can be reversibly controlled from a magnetic phase with Dirac cones to a topological antiferromagnetic insulator with non-trivial valley Chern number.

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“…Theoretical studies predicted magnon spin Nernst effect [24,25] and magnonic Edelstein effect [26,27] driven by DMI. Recently, the dipole-dipole interaction (DDI), which was usually ignored in antiferromagnets, was shown to be able to manifest itself as an effective spinorbit coupling (SOC) [28,29] between magnon states in uniaxial easy-axis AFIs. Such a magnon SOC can also give rise to various spin-orbit phenomena, e.g., an intrinsic magnon spin Hall effect (SHE) [28], D'yakonov-Perel' (DP)-type magnon spin relaxation, and topological surface states [30].…”

Section: Introductionmentioning

confidence: 99%

Spin-orbit coupling and linear crossings of dipolar magnons in van der Waals antiferromagnets

Cited by 8 publications

References 28 publications

Parity‐Time Symmetry in Magnetic Materials and Devices

Parity‐Time Symmetry in Magnetic Materials and Devices

Dipolar spin-waves and tunable band gap at the Dirac points in the 2D magnet ErBr3

Magnon spin transport around the compensation magnetic field in easy-plane antiferromagnetic insulators

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