Laser control of magnonic topological phases in antiferromagnets

Nakata, Kouki; Kim, Se‐Kwon; Takayoshi, Shintaro

doi:10.1103/physrevb.100.014421

Cited by 18 publications

(13 citation statements)

References 116 publications

(193 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Second, the laser application without chirping can be studied by the Floquet theory with inverse frequency expansion [52,53]. This analysis also supports the generation of the optical Barnett field in the high frequency regime (Appendix E).…”

Section: Discussionsupporting

confidence: 62%

Optomagnonic Barnett effect

Nakata,

Takayoshi

2020

Preprint

Self Cite

View full text Add to dashboard Cite

Combining the technologies of quantum optics and magnonics, we present a novel method to realize the Barnett effect without mechanical rotations. We show that the coupling between circularly polarized laser and spins generates an effective field analogous to the Barnett field. This optically generated Barnett field develops the total magnetization in insulating ferrimagnets with reversing the local magnetization, and realizes the quasiequilibrium Bose-Einstein condensates of magnons, the optomagnonic Barnett effect. The direction of the optical Barnett field is controllable through the change of laser chirality. We propose a realistic experimental setup to observe the optomagnonic Barnett effect using current device and measurement technologies as well as the laser chirping. Our results pave the way to control and design new optomagnetic functionalities in magnets.

show abstract

Section: Discussionsupporting

confidence: 62%

Optomagnonic Barnett effect

Nakata,

Takayoshi

2020

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

“…Previously, Floquet topological magnons were discussed in collinear ferromagnets and antiferromagnets driven by a laser field which couples to the magnetic order via the Aharonov-Casher effect [48,[59][60][61][62]. However, this approach is unsuitable for noncollinear magnetic textures whose magnetic unit cell, of paramount importance for the proper description of magnons, may itself become time-dependent [63].…”

Section: Discussionmentioning

confidence: 99%

Laser-controlled real- and reciprocal-space topology in multiferroic insulators

Hirosawa,

Klinovaja,

Loss

et al. 2021

Preprint

View full text Add to dashboard Cite

Magnetic materials in which it is possible to control the topology of their magnetic order in real space or the topology of their magnetic excitations in reciprocal space are highly sought-after as platforms for alternative data storage and computing architectures. Here we show that multiferroic insulators, owing to their magneto-electric coupling, offer a natural and advantageous way to address these two different topologies using laser fields. We demonstrate that via a delicate balance between the energy injection from a high-frequency laser and dissipation, single skyrmions-archetypical topological magnetic textures-can be set into motion with a velocity and propagation direction that can be tuned by the laser field amplitude and polarization, respectively. Moreover, we uncover an ultrafast Floquet magnonic topological phase transition in a laser-driven skyrmion crystal and we propose a new diagnostic tool to reveal it using the magnonic thermal Hall conductivity.

show abstract

“…The electric field generated by a laser implies a time-periodic perturbation amenable to Floquet theory. This route to control the effective Hamiltonian has recently been studied [89][90][91][92][93].…”

Section: A Magnon Excitationsmentioning

confidence: 99%