Dirac fermions and possible weak antilocalization in LaCuSb2

J. R. Chamorro, A. Topp, Y. Fang, M. J. Winiarski, C. R. Ast, M. Krivenkov, A. Varykhalov, B. J. Ramshaw, L. M. Schoop, T. M. McQueen

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Abstract

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, 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 nontrivial effects. Measurements of the Shubnikov-de Haas quantum oscillations show low effective mass electrons on the order of 0.065me, further confirming the presence of Dirac fermions in this material.

Original languageEnglish (US)
Article number121108
JournalApplied Physics Reviews
Volume7
Issue number12
DOIs
StatePublished - Dec 1 2019

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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    Chamorro, J. R., Topp, A., Fang, Y., Winiarski, M. J., Ast, C. R., Krivenkov, M., Varykhalov, A., Ramshaw, B. J., Schoop, L. M., & McQueen, T. M. (2019). Dirac fermions and possible weak antilocalization in LaCuSb2. Applied Physics Reviews, 7(12), [121108]. https://doi.org/10.1063/1.5124685