Pumping of magnons in a Dzyaloshinskii-Moriya ferromagnet

Kovalev, Alexey A.; Zyuzin, Vladimir A.; Li, Bo

doi:10.1103/physrevb.95.165106

Cited by 15 publications

(17 citation statements)

References 52 publications

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“…1c the number is three. The main physical property that emerges from the TMI phase is the existence of these chiral magnonic edge states which contribute to the non-vanishing thermal Hall conductivity [40,41,[43][44][45][46].…”

Section: Model and Methodsmentioning

confidence: 99%

Topological properties of multilayer magnon insulators

Hofer,

Datta,

Tewari

et al. 2020

Preprint

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Two-dimensional magnetic insulators can be promising hosts for topological magnons. In this study, we show that ABC-stacked honeycomb lattice multilayers with alternating Dzyaloshinskii-Moriya interaction (DMI) reveal a rich topological magnon phase diagram. Based on our bandstructure and Berry curvature calculations, we demonstrate jumps in the thermal Hall behavior that corroborate with topological phase transitions triggered by adjusting the DMI and interlayer coupling. We connect the phase diagram of generic multilayers to a bilayer and a trilayer system. We find an even-odd effect amongst the multilayers where the even layers show no jump in thermal Hall conductivity, but the odd layers do. We also observe the presence of topological proximity effect in our trilayer. Our results offer new schemes to manipulate Chern numbers and their measurable effects in topological magnonic systems.

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Section: Model and Methodsmentioning

confidence: 99%

Topological properties of multilayer magnon insulators

Hofer,

Datta,

Tewari

et al. 2020

Preprint

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“…Within the linear response regime, the spin and heat Hall current densities for each mode, j yσ and j Q yσ , subjected to a magnetic field gradient 105,106 and a temperature one are described by the Onsager matrix…”

Section: Hall Conductances Of Magnonsmentioning

confidence: 99%

Magnonic topological insulators in antiferromagnets

et al. 2017

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Extending the notion of symmetry protected topological phases to insulating antiferromagnets (AFs) described in terms of opposite magnetic dipole moments associated with the magnetic Néel order, we establish a bosonic counterpart of topological insulators in semiconductors. Making use of the Aharonov-Casher effect, induced by electric field gradients, we propose a magnonic analog of the quantum spin Hall effect (magnonic QSHE) for edge states that carry helical magnons. We show that such up and down magnons form the same Landau levels and perform cyclotron motion with the same frequency but propagate in opposite direction. The insulating AF becomes characterized by a topological Z2 number consisting of the Chern integer associated with each helical magnon edge state. Focusing on the topological Hall phase for magnons, we study bulk magnon effects such as magnonic spin, thermal, Nernst, and Ettinghausen effects, as well as the thermomagnetic properties of helical magnon transport both in topologically trivial and nontrivial bulk AFs and establish the magnonic Wiedemann-Franz law. We show that our predictions are within experimental reach with current device and measurement techniques.

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“…In ferromagnetic and antiferromagnetic insulators, magnons -the quantum quasiparticles carrying energy and spin -can mediate various transport phenomena. The Dzyaloshinskii-Moriya interaction (DMI) [25,26] in such systems can lead to magnon spin-momentum locking [27], magnon-mediated magnetization torques [28][29][30], and magnonic thermal Hall [31][32][33][34][35][36][37][38][39][40][41][42] and spin Nernst effects [29,[43][44][45][46][47][48][49][50][51][52]. In Ref.…”

Section: Introductionmentioning

confidence: 99%

Magnonic analog of the Edelstein effect in antiferromagnetic insulators

Mook

Raeliarijaona

et al. 2020

Phys. Rev. B

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We investigate the nonequilibrium spin polarization due to a temperature gradient in antiferromagnetic insulators, which is the magnonic analogue of the inverse spin-galvanic effect of electrons. We derive a linear response theory of a temperature-gradient-induced spin polarization for collinear and noncollinear antiferromagnets, which comprises both extrinsic and intrinsic contributions. We apply our theory to several noncentrosymmetric antiferromagnetic insulators, i.e., to a one-dimensional antiferromagnetic spin chain, a single layer of kagome noncollinear antiferromagnet, e.g., KFe3(OH)6(SO4)2, and a noncollinear breathing pyrochlore antiferromagnet, e.g., LiGaCr4O8.

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Pumping of magnons in a Dzyaloshinskii-Moriya ferromagnet

Cited by 15 publications

References 52 publications

Topological properties of multilayer magnon insulators

Topological properties of multilayer magnon insulators

Magnonic topological insulators in antiferromagnets

Magnonic analog of the Edelstein effect in antiferromagnetic insulators

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