TitleQuantum Oscillations and Dirac Dispersion in the Baznbi2 Semimetal Guaranteed by Local Zn Vacancy Order
Publication TypeJournal Article
Year of Publication2018
AuthorsZhao K., Golias E., Zhang Q.H, Krivenkov M., Jesche A., Gu L., Rader O., Mazin I.I, Gegenwart P.
JournalPhysical Review B
Date Published03/2018
Abstract

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.