Triply degenerate point in three-dimensional spinless systems

نویسندگان

چکیده

We study the possibility of triply degenerate points (TPs) that can be stabilized in spinless crystalline systems. Based on an exhaustive search over all 230 space groups, we find TPs exist at both high-symmetry and paths, they may have either linear or quadratic dispersions. For located points, share a common minimal set symmetries, which is point group $T$. The TP protected solely by $T$ chiral has Chern number $\ifmmode\pm\else\textpm\fi{}2$. By incorporating additional this evolve into pseudospin-1 point, without chirality, contact TP. accidental residing path, are not but dispersions plane normal to path. further construct effective $k\ifmmode\cdot\else\textperiodcentered\fi{}p$ models lattice for characterizing these TPs. Distinguished phenomena discussed, including extensive surface Fermi arcs Landau bands.

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ژورنال

عنوان ژورنال: Physical Review B

سال: 2021

ISSN: ['1098-0121', '1550-235X', '1538-4489']

DOI: https://doi.org/10.1103/physrevb.104.115116