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Polarization-resolved Raman spectroscopy was performed and analyzed fromlarge, high quality, mono-domain single crystal of {\alpha}-RuCl3, a proximateKitaev quantum spin liquid. Spectra were collected with laser polarizationsparallel and perpendicular to the honeycomb plane. Pairs of nearly degeneratephonons were discovered and show either a 4-fold or 2-fold polarization angledependence in their Raman intensity, thereby providing evidence to definitivelyassign the bulk crystal point group as C2h. The low frequency continuum that isoften attributed to scattering from pairs of Majorana fermions was alsoexamined and found to disappear when the laser excitation and scattered photonpolarizations were perpendicular to the honeycomb plane. This disappearance,along with the behavior of the phonon spectrum in the same polarizationconfiguration, strongly suggests that the scattering continuum is2-dimensional. We argue that this scattering continuum originates from theKitaev magnetic interactions that survives up to room temperature, a scalelarger than the bare Kitaev exchange energy of approximately 50 K.

Polarization-resolved Raman spectroscopy of {\alpha}-RuCl3 and evidence of room temperature two-dimensional magnetic scattering