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Topological phase transition with p orbitals in the exciton-polariton honeycomb lattice
Chuanyi Zhang1,2, Yuanxu Wang3, Weifeng Zhang1
1Henan Key Laboratory of Photovoltaic Materials, Henan University, Kaifeng 475004, People's Republic of China.
Abstract:
We study the topological phase transition with the TE-TM splitting in the p-orbital exciton-polariton honeycomb lattice. We find that some Dirac points survive at the high-symmetry points with space-inversion symmetry breaking, which reflects the characteristic of p orbitals. A phase diagram is obtained by the gap Chern number, from which the topological phase transition takes place in the intermediate gap. There is no topological phase transition in the bottom or top gap, and its edge state has the potential application for transporting signals in optoelectronic devices. When taking into account the non-degenerate p orbitals, we find that the bottom gap arises owing to the competition between the Zeeman energy and rotating angular velocity, and topological phase transition also appears in the complete gaps. These results can facilitate the experimental investigations of the topological properties of p-orbital exciton-polariton lattice structure.
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