Line-Node Dirac Semimetal and Topological Insulating Phase in Noncentrosymmetric Pnictides CaAgX (X = P, As)
By A. Yamakage, Y. Yamakawa, Yukio Tanaka, Y. Okamoto. 2015
171 citations recorded by the source corpus.
Two noncentrosymmetric ternary pnictides, CaAgP and CaAgAs, are reported as topological line-node semimetals protected solely by mirror-reflection symmetry. The band gap vanishes on a circle in momentum space, and surface states emerge within the circle. Extending this study to spin-orbit coupled systems reveals that, compared with CaAgP, a substantial band gap is induced in CaAgAs by large spin-orbit interaction. The resulting states are a topological insulator, in which the Z2 topological invariant is given by 1; 000. To clarify the Z2 topological invariants for time-reversal-invariant systems without spatial-inversion symmetry, we introduce an alternative way to calculate the invariants characterizing a line node and topological insulator for mirror-reflection-invariant systems.
Subfields: Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/0c34400b6827e21f7c78ba8f2f74120bca6d2c53
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In Atomic and Molecular Physics, and Optics
In Electronic, Optical and Magnetic Materials
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Citations in the corpus
- Topological Semimetals from First Principles (2018, background): “Various materials in this class of topological semimetal have been theoretically identified, including the experimentally confirmed materials, such as CaAgP (145, 146, 147) and PbTaSe2 (148, 149, 150, 147) families of materials.”