Fractional Excitation-induced Phonon Renormalization in alpha-RuCl3
alpha-RuCl3 is a promising Kitaev quantum spin liquid candidate, and above the critical magnetic field Bc~7T and below T~6K there is evidence for the half-integer quantized plateau. Recent theoretical work has shown that phonon renormalization in the QSL state should provide a clear indicator of Majorana fermion-phonon coupling. One paper examines the Majorana fermion-phonon interaction and shows that longitudinal/transverse acoustic phonons near the zone boundary soften/harden, respectively, through coupling to the fractionalized spins. Here we propose to measure the phonon dispersion under a magnetic field using INS to observe the phonon renormalization connect to the fractionalized excitations.
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MERRITT Adrian; IVANOV Alexandre and Yixi Su. (2021). Fractional Excitation-induced Phonon Renormalization in alpha-RuCl3. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.7-01-543
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