论文标题
Chalcopyite Zngesb中的压力驱动拓扑相变$ _2 $
Pressure driven topological phase transition in chalcopyrite ZnGeSb$_2$
论文作者
论文摘要
最近，在缺乏反转对称性的几个时间转换系统中已经确定了拓扑非平凡的阶段。使用基于密度函数理论的第一原理计算，我们报告了在chalchopyrite zngesb $ _2 $中具有强大的拓扑性非平凡相，可以充当紧张的HGTE模型系统。计算揭示了非零拓扑不变的（$ z_2 $），即具有自旋摩托锁定的表面光谱函数中的狄拉克锥体交叉。我们还表明，适度的静水压力（$ \ sim $ 7 GPA）的应用会导致拓扑相位从拓扑非平凡相到拓扑琐碎的相位。非中心对称zngesb $ _2 $的四方变形在驱动这种拓扑相变中起着至关重要的作用。
Recently topologically non-trivial phases have been identified in few time-reversal invariant systems that lack of inversion symmetry. Using density functional theory based first-principles calculations, we report a strong topologically non-trivial phase in chalchopyrite ZnGeSb$_2$, which can act as a model system of strained HgTe. The calculations reveal the non-zero topological invariant ($Z_2$), the presence of Dirac cone crossing in the surface spectral functions with spin-momentum locking. We also show that the application of moderate hydrostatic pressure ($\sim$7 GPa) induces topological phase transition from topological non-trivial phase to a topologically trivial phase. A discontinuity in the tetragonal distortion of non-centrosymmetric ZnGeSb$_2$ plays a crucial role in driving this topological phase transition.
