论文标题
HFTE5中的拓扑LIFSHITZ过渡和一维Weyl模式
Topological Lifshitz transition and one-dimensional Weyl mode in HfTe5
论文作者
论文摘要
Landau带横梁通常源自电子状态在磁场中的带内演化，并增强其附近的相互作用效应。在这里，在拓扑绝缘子HFTE5的极端量子限制中，我们报告了使用磁铁光谱学从带式兰道级穿越的拓扑Lifshitz的观察。通过跟踪Landau级别的过渡，我们证明了频段反演驱动Zeroth Landau频段在4.5 T之后彼此交叉，并形成一维Weyl模式，并持续关闭基本的间隙。佐罗斯·兰道水平过渡活动的异常降低表明，在21 t处的拓扑lifshitz跃迁，将韦尔模式转移到费米水平附近。结果，由于保利的阻断效应在一个维度上以及独特的负磁性抗性，因此出现了广泛而不对称的吸收特征。我们的结果为实现散装晶体中的一维Weyl准粒子提供了一种策略。
Landau band crossings typically stem from the intra-band evolution of electronic states in magnetic fields and enhance the interaction effect in their vicinity. Here in the extreme quantum limit of topological insulator HfTe5, we report the observation of a topological Lifshitz transition from inter-band Landau level crossings using magneto-infrared spectroscopy. By tracking the Landau level transitions, we demonstrate that band inversion drives the zeroth Landau bands to cross with each other after 4.5 T and forms one-dimensional Weyl mode with fundamental gap persistently closed. The unusual reduction of the zeroth Landau level transition activity suggests a topological Lifshitz transition at 21 T which shifts the Weyl mode close to Fermi level. As a result, a broad and asymmetric absorption feature emerges due to the Pauli blocking effect in one dimension, along with a distinctive negative magneto-resistivity. Our results provide a strategy for realizing one-dimensional Weyl quasiparticles in bulk crystals.
