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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
(a) Phonon spectrum and (b) density of phonon states (DOS) of CSe monolayer. The 2D Brillouin zone of CSe monolayer is shown as an insert in the phonon spectrum.