Magnon valley Hall effect in 
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-based van der Waals heterostructures

Hidalgo-Sacoto, Raúl; González, Rafael I.; Vogel, E.E.; Allende, S.; Mella, José D.; Cárdenas, Carlos; Troncoso, Roberto E.; Muñoz, Francisco

doi:10.1103/physrevb.101.205425

Cited by 34 publications

(11 citation statements)

References 81 publications

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“…(i) Our considerations should apply to other magnonic systems, e.g., van der Waals heterostructures discussed in the context of magnon valleytronics [52][53][54]; vice versa, some of the effects from Refs. [52][53][54] could be transferred to BVDESWs.…”

Section: Discussionmentioning

confidence: 99%

Spin-wave wells revisited: From wavelength conversion and Möbius modes to magnon valleytronics

Fripp

Kruglyak

2021

Phys. Rev. B

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We have used micromagnetic simulations to model backward-volume dipole-exchange spin waves in graded profiles of the bias magnetic field. We demonstrate spin-wave wavelength conversion upon the wave's reflection from turning points due to the two characteristic minima ("U points") occurring in their dispersion at finite (nonzero) wave vectors. As a result, backward-volume dipole-exchange spin waves confined in "spin-wave wells" either form Möbius modes, making multiple real-space turns for each reciprocal-space round trip, or split into pairs of degenerate modes in the valleys near the two U points. The latter modes may therefore be assigned a pseudospin. We show that the pseudospin can be switched by scattering the spin wave from decreases of the bias magnetic field, while it is immune to scattering from field increases. Pseudospin creation and read-out can be accomplished using chiral spin-wave transducers, as described in Au et al. [Appl. Phys. Lett. 100, 182404 (2012)] and Au et al. [Appl. Phys. Lett. 100, 172408 (2012)], respectively. Taken together, the possibility of pseudospin creation, manipulation, and read-out suggests a path to development of a spin-wave version of valleytronics ("magnon valleytronics"), in which the pseudospin (rather than amplitude or phase) of spin waves would be used to encode data. Our results are not limited to graded bias magnetic field but can be generalized to other magnonic media with spatially varying characteristics, produced using the toolbox of graded index magnonics.

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Section: Discussionmentioning

confidence: 99%

Spin-wave wells revisited: From wavelength conversion and Möbius modes to magnon valleytronics

Fripp

Kruglyak

2021

Phys. Rev. B

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“…4(b) and Fig. 4(c), the gapped trivial edge modes are observed in trivial band gaps, since the edge modes cannot overcome the increasing width of band gaps due to the increase of lattice deformations [82].…”

Section: B Band Topology and Magnonic Edge Modesmentioning

confidence: 94%

Topological phase transition and thermal Hall effect in kagome ferromagnets

Zhuo

Manchon

2021

Phys. Rev. B

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We investigate a new mechanism for phase transitions between topological magnon phases on the breathing kagome lattice ferromagnets with Dzyaloshinskii-Moriya interaction, which is induced by the lattice deformation. With the linear spin-wave theory, we calculate the magnonic Chern number, topological phase diagram and magnon thermal Hall conductivity at low temperature with tunable modulated exchange interactions due to the lattice deformation. We show that the modulated exchange interactions and Dzyaloshinskii-Moriya interaction strength determine the band topology of magnons. We find a sign reversal of the thermal Hall conductivity during topological phase transitions explained in terms of topological edge modes and their propagation directions. We also discuss candidate materials to realize our ideas.

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“…These unique features have led to a growing interest in TIs in other areas of knowledge [ 6 , 7 , 8 ]. They have led to applications in quantum computing [ 9 ], low-power electronics [ 10 ], next-generation solar cells [ 11 ], molecular-based spintronics [ 12 , 13 , 14 ], photonics [ 15 , 16 ], novel organometalics [ 17 ], etc. As far as chemistry is concerned, the conducting surface states of TIs may be a game-changing in catalysis [ 18 , 19 ].…”

Section: Introductionmentioning

confidence: 99%

Understanding Topological Insulators in Real Space

et al. 2021

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A real space understanding of the Su–Schrieffer–Heeger model of polyacetylene is introduced thanks to delocalization indices defined within the quantum theory of atoms in molecules. This approach enables to go beyond the analysis of electron localization usually enabled by topological insulator indices—such as IPR—enabling to differentiate between trivial and topological insulator phases. The approach is based on analyzing the electron delocalization between second neighbors, thus highlighting the relevance of the sublattices induced by chiral symmetry. Moreover, the second neighbor delocalization index, δi,i+2, also enables to identify the presence of chirality and when it is broken by doping or by eliminating atom pairs (as in the case of odd number of atoms chains). Hints to identify bulk behavior thanks to δ1,3 are also provided. Overall, we present a very simple, orbital invariant visualization tool that should help the analysis of chirality (independently of the crystallinity of the system) as well as spreading the concepts of topological behavior thanks to its relationship with well-known chemical concepts.

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Magnon valley Hall effect in CrI3 -based van der Waals heterostructures

Cited by 34 publications

References 81 publications

Spin-wave wells revisited: From wavelength conversion and Möbius modes to magnon valleytronics

Spin-wave wells revisited: From wavelength conversion and Möbius modes to magnon valleytronics

Topological phase transition and thermal Hall effect in kagome ferromagnets

Understanding Topological Insulators in Real Space

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