Journal
APL MATERIALS
Volume 7, Issue 12, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.5124685
Keywords
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Funding
- Institute for Quantum Matter, an Energy Frontier Research Center - U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0019331]
- NSF through the Princeton Center for Complex Materials, a Materials Research Science and Engineering Center [DMR-1420541]
- MURI grant on Topological Insulators from the Army Research Office [ARO W911NF-12-1-0461]
- DFG [SCHO 1730/1-1]
- National Science Foundation [1752784]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1752784] Funding Source: National Science Foundation
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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 0.065m(e), further confirming the presence of Dirac fermions in this material.
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