Terahertz excitations in alpha-RuCl3: Majorana fermions and rigid-plane shear and compression modes

Article

关键词: QUANTUM;    FRACTIONALIZATION;   

DOI  :  10.1103/PhysRevB.100.100403

来源: SCIE

【 摘 要 】

Spin liquids may host emergent quasiparticles, collective excitations of the spin degrees of freedom with characteristic features of Majorana fermions, which experimentally are detectable by broad excitation continua due to spin fractionalization. The latter is predicted for the Kitaev spin liquid, an exactly solvable model with bond-dependent interactions on a two-dimensional honeycomb lattice. Here we report on detailed terahertz experiments in alpha-RuCl3, identifying these characteristic fingerprints of Majorana fermions. The continuum intensity decreases and finally vanishes on increasing temperature. It partly overlaps with phonon modes, representing characteristic sliding and compression modes of the van der Waals bonded molecular layers.

【 授权许可】

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