Direct optical probe of magnon topology in two-dimensional quantum magnets

Abstract

Controlling edge states of topological magnon insulators is a promising route to stable spintronics devices. However, to experimentally ascertain the topology of magnon bands is a challenging task. Here we derive a fundamental relation between the light-matter coupling and the quantum geometry of magnon states. This allows to establish the two-magnon Raman circular dichroism as an optical probe of magnon topology in honeycomb magnets, in particular of the Chern number and the topological gap. Our results pave the way for interfacing light and topological magnons in functional quantum devices.

6 pages, 3 figures, 2 tables

References in corpus (10)

• Topological Photonics
• Valley Dependent Optoelectronics from Inversion Symmetry Breaking
• Topological Polaritons
• Topological Magnons and Edge States in Antiferromagnetic Skyrmion Crystals
• Magnonic topological insulators in antiferromagnets
• Twist engineering of the two-dimensional magnetism in double bilayer chromium triiodide homostructures
• Magnonic quantum Hall effect and Wiedemann-Franz law
• Magnetic field effect on topological spin excitations in CrI${}_3$
• Light-matter coupling and quantum geometry in moiré materials
• Tunable layered-magnetism-assisted magneto-Raman effect in a two-dimensional magnet $\mathrm{Cr}{\mathrm{I}}_3$

Cited by in corpus (12)

• Signatures of two- and three-dimensional semimetals from circular dichroism
• Observation of spin-wave moiré edge and cavity modes in twisted magnetic lattices
• Enhanced magnetoelectric coupling in two-dimensional hybrid multiferroic heterostructures
• Effect of biquadratic magnetic exchange interaction in the 2D antiferromagnets MPS_3 (M = Mn, Fe, Co, Ni)
• Zero-frequency chiral magnonic edge states protected by non-equilibrium topology
• Lieb lattices and pseudospin-1 dynamics under barrier- and well-like electrostatic interactions
• Cavity-Enhanced Optical Manipulation of Antiferromagnetic Magnon-Pairs
• Robustness of topological magnons in disordered arrays of skyrmions
• Reflectionless pseudospin-1 Dirac systems via Darboux transformation and flat band solutions
• Electric polarization induced by magnons and magnon Nernst effects
• Raman spectroscopy of anyons in generic Kitaev spin liquids
• Quantum geometry, localization, and topological bounds of spin fluctuations