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arXiv 1904.10312cond-mat.mes-hallphysics.optics
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玻色拓扑绝缘体中的体孤子动力学

Bulk soliton dynamics in bosonic topological insulators

Jeremy L. Marzuola, Mikael Rechtsman, Braxton Osting, Miguel Bandres

摘要:

本文从理论上研究了非线性/相互作用玻色拓扑绝缘体中空间孤子的动力学行为。我们采用了一个时间反演的破Lieb晶格模拟的一个陈氏绝缘体,并发现,在存在一个饱和的非线性,孤子分叉从一个带的非零陈氏数到拓扑带隙的涡旋状结构的子晶格。我们数值证明了存在稳定的涡旋孤子的参数范围内,晶格孤子动力学受到与大Berry曲率在拓扑Lieb带边的异常速度。新的连续介质Dirac模型很好地描述了涡旋孤子的特性。我们进一步展示了一种新的相互作用:当这些拓扑孤子'反弹'的有限结构的边缘,他们创建手征边缘状态,这引起了一个“异常”反射的孤子从边界。

英文摘要:

We theoretically explore the dynamics of spatial solitons in nonlinear/interacting bosonic topological insulators. We employ a time-reversal broken Lieb-lattice analog of a Chern insulator and find that in the presence of a saturable nonlinearity, solitons bifurcate from a band of non-zero Chern number into the topological band gap with vortex-like structure on a sublattice. We numerically demonstrate the existence stable vortex solitons for a range of parameters and that the lattice soliton dynamics are subject to the anomalous velocity associated with large Berry curvature at the topological Lieb band edge. The features of the vortex solitons are well described by a new underlying continuum Dirac model. We further show a new kind of interaction: when these topological solitons `bounce' off the edge of a finite structure, they create chiral edge states, and this give rise to an "anomalous" reflection of the soliton from the boundary.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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