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arXiv 2103.08378nlin.PScond-mat.otherphysics.optics
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非线性相互作用孤子晶格中动态出现的拓扑相变

Dynamically Emerging Topological Phase Transitions in Nonlinear Interacting Soliton Lattices

Domenico Bongiovanni, Dario Jukić, Zhichan Hu, Frane Lunić, Yi Hu, Daohong Song, Roberto Morandotti, Zhigang Chen, Hrvoje Buljan

摘要:

我们证明了由相互作用孤子阵列组成的Su-Schrieffer-Heeger(SSH)晶格中的动态拓扑相变,这种相变完全由非线性驱动,从而产生了非线性拓扑现象.相变发生从拓扑平凡到非平凡的阶段在周期性的连续与交叉从拓扑非平凡到平凡的制度。相变的特征是带隙的闭合和重新打开点,在此两个扩展态从能带被拉入带隙成为局域拓扑边缘态。通过边缘态与晶格体的解耦发生交叉。

英文摘要:

We demonstrate dynamical topological phase transitions in evolving Su-Schrieffer-Heeger (SSH) lattices made of interacting soliton arrays, which are entirely driven by nonlinearity and thereby exemplify emergent nonlinear topological phenomena. The phase transitions occur from topologically trivial-to-nontrivial phase in periodic succession with crossovers from topologically nontrivial-to-trivial regime. The signature of phase transition is gap-closing and re-opening point, where two extended states are pulled from the bands into the gap to become localized topological edge states. Crossovers occur via decoupling of the edge states from the bulk of the lattice.

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