Dirac Fermions and Possible Weak Antilocalization in LaCuSb${}_2$

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 LaCuSb${}_2$. 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 0.065$m_e$, further confirming the presence of Dirac fermions in this material.

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• Ultrahigh electron mobility in suspended graphene
• Topological nodal line semimetals
• Quantum Hall effect in a bulk antiferromagnet EuMnBi${}_2$ with magnetically confined two-dimensional Dirac fermions
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Cited by in corpus (1)

• Magnetotransport Properties of Square-Net Compounds of NbSiSb and NbGeSb Single Crystals