Here, we study the importance of macroscopic polarization for explaining the lattice dynamics of SnTe. Along with this, the robustness of (001) surface states is discussed for the practical application of this compound. The long range Coulomb forces using nonanalytical term correction are needed for proper explanation of experimental phonon modes with the Born effective charge's value of ∼5.5 (∼-5.5) for Sn (Te) atom. The peaks' positions of phonon density of states are in good agreement with the experimental observation. The Debye temperature for SnTe is found to be ∼189 K. We have also explored the possibility of protecting the (001) surface states via mirror and time-reversal symmetry. These surface states are expected to be robust against the point and line defects.

在这里，我们研究了宏观极化对于解释SnTe晶格动力学的重要性。随之，讨论了（001）表面态的鲁棒性，以用于该化合物的实际应用。为了正确解释实验声子模式，对于Sn（Te）原子，其Born有效电荷的值约为5.5（〜-5.5），需要使用非分析项校正的长距离库仑力。声子密度态的峰值位置与实验观察结果吻合良好。发现SnTe的Debye温度约为189K。我们还探索了通过镜面和时间反转对称性保护（001）表面态的可能性。这些表面状态有望抵抗点和线缺陷。