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Line-Node Dirac Semimetal and Topological Insulating Phase in Noncentrosymmetric Pnictides CaAg X(X= P, As)
Open accessAbstract
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.
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Metadata
- Authors
- Yamakage, A., Yamakawa, Y., Tanaka, Y., & Okamoto, Y.
- Venue
- Journal of the Physical Society of Japan
- Publisher
- Physical Society of Japan
- Published
- 2016-01-15
- Volume
- 85
- Issue
- 1
- Pages
- 013708
- ISSN
- 0031-9015 (ISSN-L)
- 1347-4073
- OpenAlex
- W2201791137
- Cited by
- 257
- References
- 42
- FWCI
- 14.27
- Type
- journal article
- Language
- en
- Open access
- green
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- Yamakage, A., Yamakawa, Y., Tanaka, Y., & Okamoto, Y. (2016). Line-Node Dirac Semimetal and Topological Insulating Phase in Noncentrosymmetric Pnictides CaAg X(X= P, As). Journal of the Physical Society of Japan. https://doi.org/10.7566/jpsj.85.013708
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