Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 15: Frustrated Magnets - General 2 (joint session TT/MA)

TT 15.2: Vortrag

Montag, 16. März 2020, 15:15–15:30, HSZ 304

Non-Hermitian Topology of Spontaneous Magnon Decay — •Paul McClarty1 and Jeff Rau1,21Max Planck Institute for the Physics of Complex Systems, Dresden, Germany — 2University of Windsor, Ontario, Canada

I will briefly review recent progress on topological magnons placing particular emphasis on the effects of magnon-magnon interactions on the bulk and the boundary magnons. We show that the effects of interactions on single magnon states can often be recast in terms of an energy-independent non-Hermitian Hamiltonian. The spectral function has a characteristic anisotropy, in the vicinity of magnon touching points, arising from topologically protected exceptional points or lines in the non-Hermitian spectrum. This is, in principle, detectable using inelastic neutron scattering.

[1] P.A. McClarty and J. G. Rau, Phys. Rev. B 100, 100405(R) (2019)

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