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arXiv 1402.2830physics.opticscond-mat.mes-hall
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光子Lieb晶格中体输运和边输运的实验观察

Experimental observation of bulk and edge transport in photonic Lieb lattices

D. Guzman-Silva, C. Mejia-Cortes, M. A. Bandres, M. C. Rechtsman, S. Weimann, S. Nolte, M. Segev, A. Szameit, R. A. Vicencio

摘要:

我们分析了光子Lieb晶格中光在体和边缘的输运,其独特之处在于在能带结构的中间存在一个代表定态的平带,可以形成局域体态.我们发现,散装Lieb晶格中的运输是显着影响的特定激发网站内的单位电池,由于重叠的平带状态。此外,我们证明了各向异性Lieb晶格中新的边缘态的存在。这些状态是由于晶格边缘的虚缺陷而产生的,并且不由标准紧束缚模型描述。

英文摘要:

We analyze the transport of light in the bulk and at the edge of photonic Lieb lattices, whose unique feature is the existence of a flat band representing stationary states in the middle of the band structure that can form localized bulk states. We find that transport in bulk Lieb lattices is significantly affected by the particular excitation site within the unit cell, due to overlap with the flat band states. Additionally, we demonstrate the existence of new edge states in anisotropic Lieb lattices. These states arise due to a virtual defect at the lattice edges and are not described by the standard tight-binding model.

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