Journal
ADVANCED MATERIALS
Volume 33, Issue 30, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202101591
Keywords
charge density waves; Dirac semimetals; nonsymmorphic symmetry
Categories
Funding
- Arnold and Mabel Beckman Foundation through a Beckman Young Investigator grant award
- Princeton Center for Complex Materials (PCCM)
- National Science Foundation (NSF) Materials Research Science and Engineering Center (MRSEC) [DMR-2011750]
- DOE Office of Science by Argonne National Laboratory [DE-AC02-06CH11357]
- National Science Foundation [DMR-1942447, DMR-1906325]
- NSF [CNS-1725797, DMR-1720256]
- NSF MRSEC at UC Santa Barbara
- National Science Foundation Graduate Research Fellowship Program [DGE-1650114]
- DFG [SCHO 1730/1-1]
- Impuls- und Vernetzungsfonds der Helmholtz-Gemeinschaft (Helmholtz-Russia Joint Research Groups) [HRJRG-408, HRSF-0067]
- Flatiron Institute
- Simons Foundation
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New developments in the field of topological matter are often driven by materials discovery, but many topological materials still suffer from non-ideal band structures. Introducing a new mechanism to design ideal Dirac semimetals, the nearly ideal Dirac semimetal GdSb0.46Te1.48 exhibits highly unusual transport behavior.
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 made 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, a new mechanism is introduced, which is based on charge density waves and non-symmorphic symmetry, to design an idealized Dirac semimetal. It is then shown experimentally that the antiferromagnetic compound GdSb0.46Te1.48 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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