Journal
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
Volume 85, Issue 1, Pages -Publisher
PHYSICAL SOC JAPAN
DOI: 10.7566/JPSJ.85.013708
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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 Z(2) topological invariant is given by 1; 000. To clarify the Z(2) topological invariants for timereversal-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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