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arXiv physics/0403103physics.opticscond-mat.othernlin.PS
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非线性周期晶格中的非对称涡旋孤子

Asymmetric vortex solitons in nonlinear periodic lattices

Tristram J. Alexander, Andrey A. Sukhorukov, Yuri S. Kivshar

摘要:

我们揭示了理想对称周期晶格中非对称涡旋孤子的存在,并展示了如何使用能量平衡关系系统地分析描述基本圆形流的非线性局域结构。我们提出的例子菱形,矩形,三角形涡旋孤子的正方形晶格,也描述了新的相干态的人口的顺时针和逆时针涡旋模式的周期性变化,由于通过晶格的非线性引起的动量交换。非对称涡旋孤子可以存在于不同的非线性晶格系统中,包括光致光子晶格、非线性光子晶体以及光晶格中的玻色-爱因斯坦凝聚体。

英文摘要:

We reveal the existence of asymmetric vortex solitons in ideally symmetric periodic lattices, and show how such nonlinear localized structures describing elementary circular flows can be analyzed systematically using the energy-balance relations. We present the examples of rhomboid, rectangular, and triangular vortex solitons on a square lattice, and also describe novel coherent states where the populations of clockwise and anti-clockwise vortex modes change periodically due to a nonlinearity-induced momentum exchange through the lattice. Asymmetric vortex solitons are expected to exist in different nonlinear lattice systems including optically-induced photonic lattices, nonlinear photonic crystals, and Bose-Einstein condensates in optical lattices.

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