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Both SnS and SnSe have been experimentally and theoretically confirmed astopological crystalline insulators in native rocksalt structure. Here, phononicstructure, thermodynamical properties and temperature dependent electron-phononinteraction (EPI) have investigated for both the materials in rocksalt phase.Previously performed theoretical studies have predicted the phase instabilityof SnS in this crystal structure at ambient condition. But, after a detailedstudy performing on the phonon calculation of SnS, we have predicted the phasestability of SnS with considering the Sn 4$p$ orbitals as valence states in$ab-initio$ calculation. The importance of long range Coulomb forces along withthe themodynamical properties are also described in detailed for bothmaterials. The preliminary evidence of topological phonon is found along X-Wdirection, where the linear band touching is observed as compared to type IIWeyl phononic material ZnSe. The topological phase transition is seen for thesematerials due to EPI, where non-linear temperature dependent bandgap isestimated. The predicted value of transition temperature for SnS (SnSe) isfound to be $\sim$700 K, where after this temperature the non-trivial totrivial topological phase is seen. The strength of EPI shows more strongerimpact on the electronic structure of SnS than SnSe material. The reason ofnon-linear behaviour of bandgap with rise in temperature is discussed with thehelp of temperature dependent linewidths and lineshifts of conduction band andvalence band due to EPI. The present study reveals the phase stability of SnSalong with the comparative study of thermal effect on EPI of SnS and SnSe.Further, the possibility of temperature induced topological phase transitionprovides one of important behaviour to apply these two materials for devicemaking application.

Evidence of phase stability, topological phonon and temperature-induced topological phase transition in rocksalt SnS and SnSe