A review of theoretical and experimental evidence that Kitaev magnets exhibit thermal fractionalization into Majorana fermions and Z2 fluxes, with the half-quantized thermal Hall effect as the strongest proposed signature.
Honeycomb rare-earth magnets with anisotropic exchange interactions
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abstract
We study the rare-earth magnets on a honeycomb lattice, and are particularly interested in the experimental consequences of the highly anisotropic spin interaction due to the spin-orbit entanglement. We perform a high-temperature series expansion using a generic nearest-neighbor Hamiltonian with anisotropic interactions, and obtain the heat capacity, the parallel and perpendicular spin susceptibilities, and the magnetic torque coefficients. We further examine the electron spin resonance linewidth as an important signature of the anisotropic spin interactions. Due to the small interaction energy scale of the rare-earth moments, it is experimentally feasible to realize the strong-field regime. Therefore, we perform the spin-wave analysis and study the possibility of topological magnons when a strong field is applied to the system. The application and relevance to the rare-earth Kitaev materials are discussed.
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cond-mat.str-el 1years
2019 1verdicts
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Hunting Majorana Fermions in Kitaev Magnets
A review of theoretical and experimental evidence that Kitaev magnets exhibit thermal fractionalization into Majorana fermions and Z2 fluxes, with the half-quantized thermal Hall effect as the strongest proposed signature.