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Double Dirac Nodal Line Semimetal with Torus Surface State
- Source :
- Phys. Rev. B 103, 161109 (2021)
- Publication Year :
- 2021
-
Abstract
- We propose a class of nodal line semimetals that host an eight-fold degenerate double Dirac nodal line (DDNL) with negligible spin-orbit coupling. We find only 5 of the 230 space groups host the DDNL. The DDNL can be considered as a combination of two Dirac nodal lines, and has a trivial Berry phase. This leads to two possible but completely different surface states, namely, a torus surface state covering the whole surface Brillouin zone and no surface state at all. Based on first-principles calculations, we predict that the hydrogen storage material LiBH is an ideal DDNL semimetal, where the line resides at Fermi level, is relatively flat in energy, and exhibits a large linear energy range. Interestingly, both the two novel surface states of DDNL can be realized in LiBH. Further, we predict that with a magnetic field parallel to DDNL, the Landau levels of DDNL are doubly degenerate due to Kramers-like degeneracy and have a doubly degenerate zero-mode.
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. B 103, 161109 (2021)
- Publication Type :
- Report
- Accession number :
- edsarx.2101.01523
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevB.103.L161109