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.
Highlights
Topological materials have become very popular over the last decade due to the new and interesting behaviors they display, such as protected edge states, novel excitations, and other unconventional behaviors
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
We find two-dimensional weak antilocalization and linear magnetoresistance through transport measurements and confirm the presence of linearly dispersing Dirac bands in the band structure
Summary
Topological materials have become very popular over the last decade due to the new and interesting behaviors they display, such as protected edge states, novel excitations, and other unconventional behaviors. 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.
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