Temperature-induced evolution of topological magnons in CrBr3
Novel phenomena induced by non-trivial topology of the quasiparticle bandstructure remain in the focus of modern solid-state physics. The simplest magnetic system showing topological magnons is a 2D honeycomb-lattice ferromagnet, which exhibits robust Dirac cones at the corner (K-point) of the Brillouin zone. The topological nature of the magnons promotes very characteristic q-dependent temperature-induced renormalization of the self-energy of the magnons including both lifetime and dispersion. In this experiment we propose to measure magnon excitations in a van-der-Vaals honeycomb ferromagnet CrBr3 by means of time-of-flight neutron spectroscopy at several temperatures below Tc, seeking for the unusual q-dependent renormalization. If successful, this experiment would provide a profound insight into the physics of topological magnetic systems beyond a low-temperature limit, which was mainly studied so far.
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NIKITIN Stanislav; FAK Bjorn; Karl W. Krämer and RUEEGG Christian. (2021). Temperature-induced evolution of topological magnons in CrBr3. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.DIR-236
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