Band Engineering of Dirac Semimetals Using Charge Density Waves
Source abstract
Abstract
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 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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Research context
OpenAlex topics: Topological Materials and Phenomena · 2D Materials and Applications · Graphene research and applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Department of Chemistry Princeton University Princeton NJ 08544 USA
Materials Department and Materials Research Laboratory University of California, Santa Barbara Santa Barbara CA 93106 USA
Max‐Planck‐Institut für Festkörperforschung 70569 Stuttgart Germany
Department of Physics Princeton University Princeton NJ 08544 USA
Princeton Institute for The Science and Technology of Materials Princeton NJ 08544 USA
Argonne National Laboratory 9700 South Cass Avenue Argonne IL 60439 USA
Helmholtz‐Zentrum Berlin für Materialien und Energie Elektronenspeicherring BESSY II, Albert‐Einstein‐Straße 15 12489 Berlin Germany
Department of Physics and Astronomy Stony Brook University Stony Brook NY 11974 USA
Center for Computational Quantum Physics The Flatiron Institute New York NY 10010 USA
Donostia International Physics Center, 20018 Donostia‐San Sebastian, Spain and IKERBASQUE Basque Foundation for Science Maria Diaz de Haro 3 Bilbao 48013 Spain
Funding
Arnold and Mabel Beckman Foundation · Directorate for Mathematical and Physical Sciences · U.S. Department of Energy · National Science Foundation · Helmholtz-Gemeinschaft · Simons Foundation
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