Observation of Dirac-like band dispersion in LaAgSb${}_2$

Abstract

We present a combined angle-resolved photoemission spectroscopy (ARPES) and first-principles calculations study of the electronic structure of LaAgSb${}_2$ in the entire first Brillouin zone. We observe a Dirac-cone-like structure in the vicinity of the Fermi level formed by the crossing of two linear energy bands, as well as the nested segments of Fermi surface pocket emerging from the cone. Our ARPES results show the close relationship of the Dirac cone to the charge-density-wave ordering, providing consistent explanations for exotic behaviors in this material.

arXiv comment5 pages, 4 figures

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• Observation of two-dimensional Fermi surface and Dirac dispersion in YbMnSb${}_2$
• Correlated materials design: prospects and challenges
• Revealing extremely low energy amplitude modes in the charge-density-wave compound LaAgSb${}_2$
• Dirac Fermions and Possible Weak Antilocalization in LaCuSb${}_2$
• Superconductivity and Dirac Fermions in 112-phase Pnictides
• Significant change in the electronic behavior associated with structural distortions in the single crystalline SrAg4As2
• Electronic band structure and surface states in Dirac semimetal LaAgSb${}_2$
• Evidence for nesting driven charge density waves instabilities in a quasi-two-dimensional material: LaAgSb2
• Successive destruction of charge density wave states by pressure in LaAgSb${}_2$
• Tuning of charge density wave transitions in LaAu${}_x$Sb${}_2$ by pressure and Au-stoichiometry
• Lattice dynamics of topological Dirac semimetal LaAgSb${}_2$ with charge density wave ordering
• Observation of superconductivity and its enhancement at the charge density wave critical point in LaAgSb${}_2$
• Magnetotransport studies of the Sb square-net compound LaAgSb${}_2$ under high pressure and rotating magnetic fields
• Coexistence of Dirac fermion and charge density wave in square-net-based semimetal LaAuSb2
• Observation of quantum oscillations, linear magnetoresistance, and crystalline electric field effect in quasi-two-dimensional PrAgBi${}_2$
• NMR evidence for a Peierls transition in the layered square-net compound LaAgSb${}_2$
• Dirac Dispersions and Fermi Surface Nesting in LaCuSb${}_2$
• Quantum oscillations and transport properties of layered single-crystal SrCu${}_4$As${}_2$
• Magnetization and magneto-transport measurements on CeBi single crystals