Layered heavy-metal square-lattice compounds have recently emerged as potential Dirac fermion materials due to bonding within those sublattices. We report quantum transport and spectroscopic data on the layered Sb square-lattice material LaCuSb2. Linearly dispersing band crossings, necessary to generate Dirac fermions, are experimentally observed in the electronic band structure observed using angle-resolved photoemission spectroscopy (ARPES), along with a quasi-two-dimensional Fermi surface. Weak antilocalization that arises from two-dimensional transport is observed in the magnetoresistance, as well as regions of linear dependence, both of which are indicative of topologically non-trivial effects. Measurements of the Shubnikov-de Haas (SdH) quantum oscillations show low effective mass electrons on the order of 0.065me, further confirming the presence of Dirac fermions in this material.
@article{arxiv.2001.00703,
title = {Dirac Fermions and Possible Weak Antilocalization in LaCuSb$_{2}$},
author = {J. R. Chamorro and A. Topp and Y. Fang and M. J. Winiarski and C. R. Ast and M. Krivenkov and A. Varykhalov and B. J. Ramshaw and L. Schoop and T. M. McQueen},
journal= {arXiv preprint arXiv:2001.00703},
year = {2020}
}