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The nuclear modification factor ${R}_{\rm AA}$ and the elliptic flowcoefficient ${v}_{\rm 2}$ of charm-strange meson $D^{+}_{s}$ is systematicallystudied in Pb--Pb collisions at $\sqrt{s_{\rm NN}}=5.02~{\rm TeV}$ and$2.76~{\rm TeV}$. During the modeling, the coupling strength between theinjected charm quark and the incident medium constituents, is extracted fromthe lattice QCD calculations: $2\pi TD_{s}=7$ (\textbf{Model-A}) and $2\piTD_{s}=1.3 + (T/T_{c})^2$ (\textbf{Model-B}). We find that, comparing ${R}_{\rmAA}(D^{+}_{s})$ with ${R}_{\rm AA}(non-strange)$, the heavy-light coalescenceeffect is more pronounced for the former one, resulting in an enhancementbehavior in the range $2\lesssim {p}_{\rm T}\lesssim5~{\rm GeV}$. Thepredictions of ${R}_{\rm AA}(D^{+}_{s})$ and ${R}_{\rm AA}(non-strange)$ favorModel-A to have a better description of the measured ${p}_{\rm T}$ dependencein both energies, while their ${v}_{\rm 2}$ prefer Model-B at moderate${p}_{\rm T}$ ($2\lesssim {p}_{\rm T}\lesssim4~{\rm GeV}$). Therefore, it isnecessary to consider the temperature- and/or momentum-dependence of $2\piTD_{s}$ to describe simultaneously ${R}_{\rm AA}(D^{+}_{s})$ and ${v}_{\rm2}(D^{+}_{s})$ in different centrality classes in Pb--Pb collisions.

Charm-strange meson production in ultra-relativistic heavy-ion collisions at the CERN-LHC energies