Chiral excitations and the intermediate-field spin-liquid regime in the Kitaev magnet $\alpha$-RuCl$_3$
arXiv (Cornell University)(2023)
摘要
In the Kitaev magnet $\alpha$-RuCl$_3$, the existence of a magnetic-field-induced quantum spin liquid phase and of anyonic excitations are discussed controversially. We address this elusive, exotic phase via helicity-dependent Raman scattering and analyze the Raman optical activity of excitations as a function of magnetic field and temperature. The hotly debated field regime between 7.5 T and 10.5 T is characterized by clear spectroscopic signatures such as a plateau of the Raman optical activity of the dominant, chiral spin-flip excitation. This provides direct evidence for the existence of a distinct intermediate field regime compatible with a quantum spin liquid phase.
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关键词
kitaev magnet,chiral excitations,intermediate-field,spin-liquid
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