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Charge-4 Weyl point: Minimum lattice model and chirality-dependent properties
- Source :
- Phys. Rev. B 104, 075115 (2021)
- Publication Year :
- 2021
-
Abstract
- Topological Weyl semimetals have been attracting broad interest. Recently, a new type of Weyl point with topological charge of $4$, termed as charge-4 Weyl point (C-4 WP), was proposed in spinless systems. Here, we show the minimum symmetry requirement for C-4 WP is point group $T$ together with ${\cal T}$ symmetry or point group $O$. We establish a minimum tight-binding model for C-4 WP on a cubic lattice with time-reversal symmetry and without spin-orbit coupling effect. This lattice model is a two-band one, ontaining only one pair of C-4 WPs with opposite chirality around Fermi level. Based on both the low-energy effective Hamiltonian and the minimum lattice model, we investigate the electronic, optical and magnetic properties of C-4 WP. Several chirality-dependent properties are revealed, such as chiral Landau bands, quantized circular photogalvanic effect and quadruple-helicoid surface arc states. Furthermore, we predict that under symmetry breaking, various exotic topological phases can evolve out of C-4 WPs. Our work not only reveals several interesting phenomena associate to C-4 WPs, but also provides a simple and ideal lattice model of C-4 WP, which will be helpful for the subsequent study on C-4 WPs.
- Subjects :
- Condensed Matter - Materials Science
Subjects
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. B 104, 075115 (2021)
- Publication Type :
- Report
- Accession number :
- edsarx.2106.01948
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevB.104.075115