ZrTe5微晶的应变调谐拓扑相变和非常规塞曼效应
Strain-tuned topological phase transition and unconventional Zeeman effect in ZrTe5 microcrystals
摘要：
电子波函数的几何相位（Berry相位）是固体中拓扑性质的基本基础。调制能带结构为Berry相位提供了一个调谐旋钮，并且在极端情况下驱动拓扑相变。尽管拓扑材料研究取得了重大进展，但在同一材料中，在不同拓扑相之间进行调谐，同时追踪Berry相对量子电荷输运的影响仍然是一个挑战。在这里，我们报告都在ZrTe5的磁输运研究。通过调整单轴应变的能带结构，我们直接映射了一个弱到强的拓扑相变通过一个无隙的狄拉克半金属相通过量子振荡。此外，我们证明了应变可调自旋相关的Berry相位的塞曼效应通过量子振荡的振幅的影响。我们发现，这样的自旋相关的Berry相位，在很大程度上被忽略的固态系统中，是至关重要的狄拉克带拓扑材料中的量子振荡建模。
英文摘要：
The geometric phase (Berry phase) of an electronic wave function is the fundamental basis of the topological properties in solids. Modulating band structure provides a tuning knob for the Berry phase, and in the extreme case drives a topological phase transition. Despite the significant developments in topological materials study, it remains a challenge to tune between different topological phases while tracing the impact of the Berry phase on quantum charge transport, in the same material. Here we report both in a magnetotransport study of ZrTe5. By tuning the band structure with uniaxial strain, we directly map a weak- to strong- topological phase transition through a gapless Dirac semimetal phase via quantum oscillations. Moreover, we demonstrate the impact of the strain-tunable spin-dependent Berry phase on the Zeeman effect through the amplitude of the quantum oscillations. We show that such a spin-dependent Berry phase, largely neglected in solid-state systems, is critical in modeling quantum oscillations in Dirac bands in topological materials.
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