论文标题
拓扑相变和声子空间dirac拓扑表面$ _5 $
Topological phase transition and phonon-space Dirac topology surfaces in ZrTe$_5$
论文作者
论文摘要
We use first-principles methods to reveal that in ZrTe$_5$, a layered van der Waals material like graphite, atomic displacements corresponding to five of the six zone-center A$_g$ (symmetry-preserving) phonon modes can drive a topological phase transition from strong to weak topological insulator with a Dirac semimetal state emerging at the transition, giving rise to a Dirac topology surface in the由A $ _G $声子模式形成的多维空间。这意味着可以使用许多不同的外部刺激设置来实现Zrte $ _5 $中的拓扑相变，这些刺激能够通过声子空间狄拉克表面穿透而不打破晶体学对称性。此外，我们预测，具有相反符号的有效质量的域可以通过激光泵送创建，并将托管沿域边界传播的相反手性的Weyl模式。研究声子空间拓扑表面为理解和利用Zrte $ _5 $和相关量子材料的外来物理特性提供了新的途径。
We use first-principles methods to reveal that in ZrTe$_5$, a layered van der Waals material like graphite, atomic displacements corresponding to five of the six zone-center A$_g$ (symmetry-preserving) phonon modes can drive a topological phase transition from strong to weak topological insulator with a Dirac semimetal state emerging at the transition, giving rise to a Dirac topology surface in the multi-dimensional space formed by the A$_g$ phonon modes. This implies that the topological phase transition in ZrTe$_5$ can be realized with many different settings of external stimuli that are capable of penetrating through the phonon-space Dirac surface without breaking the crystallographic symmetry. Furthermore, we predict that domains with effective mass of opposite signs can be created by laser pumping and will host Weyl modes of opposite chirality propagating along the domain boundaries. Studying phonon-space topology surfaces provides a new route to understanding and utilizing the exotic physical properties of ZrTe$_5$ and related quantum materials.
