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2018 ; 8
(1
): 4431
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Photoinduced Topological Phase Transitions in Topological Magnon Insulators
#MMPMID29535433
Owerre SA
Sci Rep
2018[Mar]; 8
(1
): 4431
PMID29535433
show ga
Topological magnon insulators are the bosonic analogs of electronic topological
insulators. They are manifested in magnetic materials with topologically
nontrivial magnon bands as realized experimentally in a quasi-two-dimensional
(quasi-2D) kagomé ferromagnet Cu(1-3, bdc), and they also possess protected
magnon edge modes. These topological magnetic materials can transport heat as
well as spin currents, hence they can be useful for spintronic applications.
Moreover, as magnons are charge-neutral spin-1 bosonic quasiparticles with a
magnetic dipole moment, topological magnon materials can also interact with
electromagnetic fields through the Aharonov-Casher effect. In this report, we
study photoinduced topological phase transitions in intrinsic topological magnon
insulators in the kagomé ferromagnets. Using magnonic Floquet-Bloch theory, we
show that by varying the light intensity, periodically driven intrinsic
topological magnetic materials can be manipulated into different topological
phases with different sign of the Berry curvatures and the thermal Hall
conductivity. We further show that, under certain conditions, periodically driven
gapped topological magnon insulators can also be tuned to synthetic gapless
topological magnon semimetals with Dirac-Weyl magnon cones. We envision that this
work will pave the way for interesting new potential practical applications in
topological magnetic materials.