Quantum oscillations and Dirac dispersion in the BaZnBi2 semimetal guaranteed by local Zn vacancy order

Article

关键词: CD3AS2;    DISCOVERY;    GRAPHENE;   

DOI  :  10.1103/PhysRevB.97.115166

来源: SCIE

【 摘 要 】

We have synthesized single crystals of Dirac semimetal candidates AZnBi(2) with A = Ba and Sr. In contrast to A = Sr, the Ba material displays a local Zn vacancy ordering, which makes the observation of quantum oscillations in out-of-plane magnetic fields possible. As a Dirac semimetal candidate, BaZnBi2 exhibits a small cyclotron electron mass, high quantum mobility, and nontrivial Berry phases. Three Dirac dispersions are observed by angle-resolved photoemission spectroscopy and identified by first-principles band-structure calculations. Compared to AMn(Bi/Sb)(2) systems which host Mn magnetic moments, BaZnBi2 acts as a nonmagnetic analog to investigate the intrinsic properties of Dirac fermions in this structure family.

【 授权许可】

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