Band Engineering of Dirac Semimetals using Charge Density Waves

Abstract

New developments in the field of topological matter are often driven by materials discovery, including novel topological insulators, Dirac semimetals and Weyl semimetals. In the last few years, large efforts have been performed to classify all known inorganic materials with respect to their topology. Unfortunately, a large number of topological materials suffer from non-ideal band structures. For example, topological bands are frequently convoluted with trivial ones, and band structure features of interest can appear far below the Fermi level. This leaves just a handful of materials that are intensively studied. Finding strategies to design new topological materials is a solution. Here we introduce a new mechanism that is based on charge density waves and non-symmorphic symmetry to design an idealized Dirac semimetal. We then show experimentally that the antiferromagnetic compound GdSb${}_{0.46}$Te${}_{1.48}$ is a nearly ideal Dirac semimetal based on the proposed mechanism, meaning that most interfering bands at the Fermi level are suppressed. Its highly unusual transport behavior points to a thus far unknown regime, in which Dirac carriers with Fermi energy very close to the node seem to gradually localize in the presence of lattice and magnetic disorder.

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Cited by in corpus (23)

• Evolving Devil's staircase magnetization from tunable charge density waves in nonsymmorphic Dirac semimetals
• Charge density wave induced nodal lines in LaTe${}_3$
• Magnetic Topological Semimetal Phase with Electronic Correlation Enhancement in SmSbTe
• Competing magnetic phases in LnSbTe (Ln = Ho and Tb)
• Giant magnetoresistance, Fermi surface topology, Shoenberg effect and vanishing quantum oscillations in type-II Dirac semimetal candidates MoSi${}_2$ and WSi${}_2$
• Colossal negative magnetoresistance in the complex charge density wave regime of an antiferromagnetic Dirac semimetal
• Evolution of Magnetism in Magnetic Topological Semimetal NdSb${}_x$Te${}_{2-x+\delta }$
• Evolution of Electronic and Magnetic Properties in Topological Semimetal SmSbxTe2-x
• Weyl nodal ring states and Landau quantization with very large magnetoresistance in square-net magnet EuGa${}_4$
• Origin of Charge Density Wave in Topological Semimetals SrAl4 and EuAl4
• On the magnetic structures of 1:1:1 stoichiometric topological phases LnSbTe (Ln = Pr, Nd, Dy and Er)
• Floating Edge Bands in the Bernevig-Hughes-Zhang model with Altermagnetism
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• Large Negative Magnetoresistance in off-Stochiometric Topological Material PrSbTe
• Supercell formation in epitaxial rare-earth ditelluride thin films
• Purely anharmonic charge-density wave in the 2D Dirac semimetal SnP
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• Kramers nodal line in the charge density wave state of YTe${}_3$ and the influence of twin domains