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2018 ; 8
(1
): 10098
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Floquet Weyl Magnons in Three-Dimensional Quantum Magnets
#MMPMID29973626
Owerre SA
Sci Rep
2018[Jul]; 8
(1
): 10098
PMID29973626
show ga
In three-dimensional (3D) quantum magnets, magnonic Weyl points (WPs) featuring
linear band crossing of two non-degenerate magnon branches can emerge in certain
lattice geometry when time-reversal symmetry is broken macroscopically.
Unfortunately, there are very limited 3D quantum magnets that host magnonic WPs,
and they are yet to be observed experimentally because the intrinsic perturbative
interactions that break time-reversal symmetry macroscopically can be very
negligible. Here, we present an alternative means via photo-irradiation, in which
magnonic WPs can emerge in 3D quantum magnets without relying on intrinsic
perturbative interactions to break time-reversal symmetry. By utilizing the
magnonic Floquet-Bloch theory, we put forward the general theory of magnonic
Floquet WPs in 3D quantum magnets. We show that periodically driven 3D magnonic
Dirac nodal-line (DNL) and 3D magnonic gapped trivial insulators can generate 3D
magnonic Floquet WPs, which can be tuned by the incident circularly-polarized
light. We demonstrate the existence of magnonic Floquet WPs by combining the
study of the magnon dispersions, Berry curvatures, and the anomalous thermal Hall
effect. The general theoretical formalism can be applied to different magnetic
insulators, and thus extending the concept of magnonic WPs to a broader class of
3D magnetically ordered systems.