Effective spin-2 quasi-particles at linear dispersive five-fold degenerate points with tunable topological Chern numbers |
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Authors: | Cheng Feng Qiang Wang S.N. Zhu Hui Liu |
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Affiliation: | National Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing 210093, China |
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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. |
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Keywords: | Corresponding authors. Spin-2 Chern Topological band |
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