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Effective Spin-2 Quasi-particles at Linear Dispersive Five-fold Degenerate Points with Tunable Topological Chern Numbers
- Source :
- Physics Letters A 383, 2139 (2019)
- Publication Year :
- 2019
-
Abstract
- In this work, which is based on spin-2 vectors and traceless spin-2 tensors, an effective Hamiltonian is constructed with a linearly dispersive five-fold degenerate point with spin-2 vector-momentum couplings. For the model without spin-2 vector-tensor coupling, the topological Chern numbers of five bands are calculated as 4, 2, 0, -2, -4. After including spin-2 vector-tensor coupling, separate topological Chern numbers are obtained for different couplings. A cubic lattice of atoms with five internal states is designed to realize two five-fold degenerate points. The Chern numbers of the bands can be changed by tuning the coupling coefficient. In this work we propose a theoretical design to obtain spin-2 quasi-particles.<br />Comment: 11 pages, 4 figures
Details
- Database :
- arXiv
- Journal :
- Physics Letters A 383, 2139 (2019)
- Publication Type :
- Report
- Accession number :
- edsarx.1905.08435
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1016/j.physleta.2019.04.016