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Two-dimensional vector solitons in a cold atomic gas via electromagnetically induced transparency |
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| Affiliation: | 1. The School of Electronic and Information Engineering, Hubei University of Science and Technology, Xianning 437100, China;2. Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices, South China Normal University, Guangzhou, 510631, China;3. Texas A&M University at Qatar, P.O. Box 23874, Doha, Qatar;4. Institute of Physics Belgrade, Pregrevica 118, 11080 Zemun, Serbia |
| Abstract: | We investigate the formation and propagation of vector vortex solitons (VSs) and unipolar solitons (USs) in a cold coherent atomic gas with a Bessel lattice (BL). The system considered is a gas with a tripod level configuration. Owing to the big enhancement of Kerr nonlinearity contributed by the electromagnetically induced transparency (EIT), a weak vector vortex soliton can be effectively formed with ultraslow propagation velocity. We also demonstrate that the characteristics of two-dimensional VSs and USs can be controlled and manipulated by adjusting the parameters of BL. Results obtained may be useful for designing all-optical switches at low light levels. |
| Keywords: | Vector vortex solitons Unipolar solitons Electromagnetically induced transparency Cold atomic gas |
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