Topological polaritons from photonic Dirac cones coupled to excitons in a magnetic field
作者： Kexin Yi , Torsten Karzig
DOI: 10.1103/PHYSREVB.93.104303
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摘要: We introduce an alternative scheme for creating topological polaritons (topolaritons) by exploiting the presence of photonic Dirac cones in crystals with triangular lattice symmetry. As recently proposed, topolariton states can emerge from a coupling between photons and excitons combined periodic exciton potential magnetic field to open up gap. show that opening gap be substantially simplified close points. Coupling Zeeman-split breaks time reversal symmetry allows out nontrival way, leading similar strength potential. Compared original proposal [T. Karzig et al., Phys. Rev. X 5, 031001 (2015)], this significantly increases size over wide range parameters. Moreover, mechanism highlights interesting connection topolaritons [F. D. M. Haldane S. Raghu, Lett. 100, 013904 (2008)] create magneto-optically active materials.
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