Physics

Observation of anomalous Hall resonance of massive Dirac fermions in topological kagome-lattice magnet

Y. Okamura, K. Shoriki, et al.

Discover the groundbreaking study by Y. Okamura and colleagues that unveils a resonantly enhanced magneto-optical response in massive Dirac fermions within the kagome-lattice magnet TbMn6Sn6. The research reveals significant contributions from interband transitions to the optical Hall conductivity, showcasing a robust anomalous Hall response, even at room temperature, and shedding light on the universal electrodynamics in quantum anomalous Hall states.

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Abstract

This paper presents the observation of a resonantly enhanced magneto-optical response of massive Dirac fermions in the kagome-lattice magnet TbMn6Sn6. Infrared magneto-optical spectroscopy reveals that interband transitions on massive Dirac bands significantly contribute to the observed resonance in the optical Hall conductivity. An analytical model accurately reproduces the spectral characteristics, demonstrating a robust anomalous Hall response, nearly 20% of the quantized Hall conductance per kagome layer, even at room temperature. These findings establish the general optical response of massive Dirac fermions and its close relation to universal electrodynamics in the quantum anomalous Hall state.

Publisher

npj Quantum Materials

Published On

Oct 12, 2023

Authors

Y. Okamura, K. Shoriki, Y. Nomura, Y. Fujishiro, A. Kitaori, N. Kanazawa, R. Arita, Y. Tokura, Y. Takahashi