Phase transition in magnon bands in a honeycomb ferromagnet driven by sublattice symmetry breaking
ORAL
Abstract
Ferromagnetic honeycomb systems are known to exhibit a magnonic topological phase under the existence
of the next-nearest-neighbor Dzyaloshinskii-Moriya interaction (DMI). Motivated by the recent progress in
the sublattice-specific control of magnetic anisotropy, we study the topological phase of magnon bands of
a honeycomb ferromagnetic monolayer and a bilayer with sublattice symmetry breaking due to the different
anisotropy energy in the presence of the DMI. We show that there is a topological phase transition between the
topological magnon insulator and the topologically trivial magnon phase driven by the change of the relative
size of the DMI and the anisotropy differences between the sublattices. The magnon thermal Hall conductivity
is proposed as an experimental probe of the magnon topology
of the next-nearest-neighbor Dzyaloshinskii-Moriya interaction (DMI). Motivated by the recent progress in
the sublattice-specific control of magnetic anisotropy, we study the topological phase of magnon bands of
a honeycomb ferromagnetic monolayer and a bilayer with sublattice symmetry breaking due to the different
anisotropy energy in the presence of the DMI. We show that there is a topological phase transition between the
topological magnon insulator and the topologically trivial magnon phase driven by the change of the relative
size of the DMI and the anisotropy differences between the sublattices. The magnon thermal Hall conductivity
is proposed as an experimental probe of the magnon topology
*This work was supported by Brain Pool Plus Program through the National Research Foundation of Korea funded by the Ministry of Science and ICT (NRF2020H1D3A2A03099291), by the National Research Foundation of Korea(NRF) grant funded by the Korea government(MSIT) (NRF-2021R1C1C1006273), and by the National Research Foundation of Korea funded by the Korea Government via the SRC Center for Quantum Coherence in Condensed Matter (NRF-2016R1A5A1008184).
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Publication: H. Kim and S. K. Kim, Topological phase transition in magnon bands in a honeycomb ferromagnet driven by sublattice symmetry breaking, Phys. Rev. B 106, 104430 (2022)
Presenters
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Hongseok Kim
- KAIST