局域Zn空位有序保证的BaZnBi2半金属中的量子振荡和Dirac色散
Quantum oscillations and Dirac dispersion in the BaZnBi2 semimetal guaranteed by local Zn vacancy order
摘要：
我们已经合成了狄拉克半金属候选人AZnBi 2与A=Ba和Sr的单晶体。与A=Sr相比，Ba材料显示出一种新的局部Zn空位有序，这使得在面外磁场中观察量子振荡成为可能。作为一种新的狄拉克半金属候选材料，BaZnBi 2具有小的回旋电子质量，高的量子迁移率和非平凡的Berry相。用ARPES观测到了三种狄拉克色散，并用第一性原理能带结构计算确定了它们的存在。与具有Mn磁矩的AMn（Bi/Sb）2系统相比，BaZnBi 2作为非磁性模拟物研究了该结构族中Dirac费米子的内禀性质.
英文摘要：
We have synthesized single crystals of Dirac semimetal candidates AZnBi2 with A=Ba and Sr. In contrast to A=Sr, the Ba material displays a novel local Zn vacancy ordering, which makes the observation of quantum oscillations in out-of-plane magnetic fields possible. As a new Dirac semimetal candidate, BaZnBi2 exhibits small cyclotron electron mass, high quantum mobility, and non-trivial Berry phases. Three Dirac dispersions are observed by ARPES and identified by first- principles band-structure calculations. Compared to AMn(Bi/Sb)2 systems which host Mn magnetic moments, BaZnBi2 acts as non-magnetic analogue to investigate the intrinsic properties of Dirac fermions in this structure family.
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