论文标题
工程在Zrte $ _5 $
Engineering a pure Dirac regime in ZrTe$_5$
论文作者
论文摘要
现实世界的拓扑半学通常表现出与琐碎的费米口袋共存的狄拉克和Weyl节点。这倾向于掩盖相对论准颗粒的物理。使用ZRTE5的示例，我们表明应变为频带结构的原位调整提供了强大的工具，使所有琐碎的口袋都远离费米能量，但仅用于一定范围的范德瓦尔斯间隙。我们的结果自然会和解有关Zrte $ _5 $中存在或不存在其他口袋的报告，并提供了一个清晰的地图，即在材料的结构参数空间中找到纯粹的三维迪拉克半金属相位。
Real-world topological semimetals typically exhibit Dirac and Weyl nodes that coexist with trivial Fermi pockets. This tends to mask the physics of the relativistic quasiparticles. Using the example of ZrTe5, we show that strain provides a powerful tool for in-situ tuning of the band structure such that all trivial pockets are pushed far away from the Fermi energy, but only for a certain range of Van der Waals gaps. Our results naturally reconcile contradicting reports on the presence or absence of additional pockets in ZrTe$_5$, and provide a clear map of where to find a pure three-dimensional Dirac semimetallic phase in the structural parameter space of the material.
