Science· 2014Q1
Discovery of a Three-Dimensional Topological Dirac Semimetal, Na <sub>3</sub> Bi
- 2,325citations
- Q1SCImago
- 2014year
Short summary
Na<sub>3</sub>Bi has been identified as the first material exhibiting three-dimensional (3D) Dirac semimetal properties, featuring 3D Dirac fermions with linear dispersions in all momentum directions.
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Key points
- Na<sub>3</sub>Bi is identified as the first material exhibiting three-dimensional (3D) topological Dirac semimetal properties.
- The material hosts 3D Dirac fermions with linear dispersions along all momentum directions.
- These 3D Dirac fermions are robust against in situ surface doping.
- Na<sub>3</sub>Bi serves as a model system for studying quantum phase transitions between topological quantum states.
AI-generated from the title and abstract; the full text is not read.
Abstract
Three-dimensional (3D) topological Dirac semimetals (TDSs) represent an unusual state of quantum matter that can be viewed as "3D graphene." In contrast to 2D Dirac fermions in graphene or on the surface of 3D topological insulators, TDSs possess 3D Dirac fermions in the bulk. By investigating the electronic structure of Na3Bi with angle-resolved photoemission spectroscopy, we detected 3D Dirac fermions with linear dispersions along all momentum directions. Furthermore, we demonstrated the robustness of 3D Dirac fermions in Na3Bi against in situ surface doping. Our results establish Na3Bi as a model system for 3D TDSs, which can serve as an ideal platform for the systematic study of quantum phase transitions between rich topological quantum states.
The authors' abstract, as published at the source. Science, 2014 · DOI ↗
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Field: Atomic and Molecular Physics, and Optics
Atomic and Molecular Physics, and OpticsPhysics and Astronomy