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THz excitations in {\alpha}-RuCl3: Majorana fermions, rigid-plane shear and compression modes

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arxiv 1902.10453 v1 pith:BED2CJUL submitted 2019-02-27 cond-mat.str-el

S. Reschke , V. Tsurkan , S.-H. Do , K.-Y. Choi , P. Lunkenheimer , Zhe Wang , A. Loidl This is my paper · ORCID
classification cond-mat.str-el
keywords spincharacteristicfermionsmajoranamodesalphacompressionexcitations
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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 THz 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.

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  1. High-Field Quantum Disordered State in $\alpha$-RuCl3: Spin Flips, Bound States, and a Multi-Particle Continuum

    cond-mat.str-el 2019-08 conditional novelty 7.0 of 10

    The high-field phase of α-RuCl3 is a partially polarized quantum disordered state with a single spin-flip mode, a two-particle bound state, and a gapped continuum.

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