Dirac fermions and possible weak antilocalization in LaCuSb2
Source abstract
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.
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Research context
OpenAlex topics: Topological Materials and Phenomena · Rare-earth and actinide compounds · Iron-based superconductors research
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Department of Chemistry, The Johns Hopkins University 1 , Baltimore, Maryland 21218, USA
Institute for Quantum Matter, Department of Physics and Astronomy, The Johns Hopkins University 2 , Baltimore, Maryland 21218, USA
Max-Planck-Institut für Festkörperforschung 3 , Heisenbergstraβe 1, D-70569 Stuttgart, Germany
Department of Chemistry, Princeton University 4 , Princeton, New Jersey 08544, USA
Laboratory of Atomic and Solid State Physics, Cornell University 5 , Ithaca, New York 14853, USA
Faculty of Applied Physics and Mathematics, Gdansk University of Technology 6 , ul. Narutowicza 11/12, 80-233 Gdansk, Poland
Helmholtz-Zentrum Berlin für Materialien und Energie, Elektronenspeicherring BESSY II 7 , Albert-Einstein-Straße 15, 12489 Berlin, Germany
Department of Materials Science and Engineering, The Johns Hopkins University 8 , Baltimore, Maryland 21218, USA
Funding
National Science Foundation · Deutsche Forschungsgemeinschaft · U.S. Department of Energy · Multidisciplinary University Research Initiative
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