期刊
LASER & PHOTONICS REVIEWS
卷 9, 期 3, 页码 331-338出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/lpor.201400428
关键词
photonic Floquet topological insulators; atomic ensembles; honeycomb lattices
资金
- 973 Program [2012CB921804]
- KSTIT of Shaanxi province [2014KCT-10]
- CPSF [2014T70923, 2012M521773]
- NSFC [61308015, 11474228]
- NSFC of Shaanxi province [2014JQ8341]
- Qatar National Research Fund (Qatar Foundation) [NPRP 6-021-1-005]
The feasibility of realizing a photonic Floquet topological insulator (PFTI) in an atomic ensemble is demonstrated. The interference of three coupling fields will split energy levels periodically, to form a periodic refractive index structure with honeycomb profile that can be adjusted by different frequency detunings and intensities of the coupling fields. This in turn will affect the appearance of Dirac cones in momentum space. When the honeycomb lattice sites are helically ordered along the propagation direction, gaps open at Dirac points, and one obtains a PFTI in an atomic vapor. An obliquely incident beam will be able to move along the zigzag edge of the lattice without scattering energy into the PFTI, due to the confinement of edge states. The appearance of Dirac cones and the formation of a photonic Floquet topological insulator can be shut down by the third-order nonlinear susceptibility and opened up by the fifth-order one.
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