Effects of in-plane stiffness and charge transfer on thermal expansion of monolayer transition metal dichalcogenide<xref ref-type="fn" rid="cpb141703fn1">*</xref>

Effects of in-plane stiffness and charge transfer on thermal expansion of monolayer transition metal dichalcogenide*

Wang Zhan-Yu^a),^b), Zhou Yan-Li^c), Wang Xue-Qing^b), Wang Fei^a),^b), Sun Qiang^a),^b), Guo Zheng-Xiao^a),^b),^d), Jia Yu^a),^b)†

Ab initio calculations of phonon dispersion curves along the Γ – M – K – Γ direction of the BZ, and vibrational density of states (DOS) for monolayer MX ₂ at the equilibrium volume. All branches are presented with sharing the same scale of frequency. All acoustical modes (ZA, TA, and LA) as well as vibrational DOS are shown using the same graph legend.