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arXiv 1704.04713physics.opticscond-mat.mtrl-sci
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光子零模非厄米平坦带中的缺陷态

Defect states emerging from a non-Hermitian flat band of photonic zero modes

Bingkun Qi, Lingxuan Zhang, Li Ge

摘要:

我们证明了在增益和损耗调制的晶格系统中存在由光子零模组成的平带,这是由于潜在的非厄米粒子-空穴对称性。这一普遍发现解释了先前在宇称时间对称系统中的观察,其中隐藏了非厄米粒子-空穴对称性。我们进一步讨论了这些系统中的缺陷态,它们的出现可以看作是在复值赝磁场的影响下赝自旋的非常规排列。这些缺陷态也表现为具有两种类型的链接的链,一种在晶胞中是刚性的,一种在晶胞之间是软的,因为缺陷态随着增益和损耗强度而变得越来越局部化。一个现实的光子学设计的基础上耦合InP/InGaAsP波导,我们也扩展到二维和三维晶格的讨论。

英文摘要:

We show the existence of a flat band consisting of photonic zero modes in a gain and loss modulated lattice system, as a result of the underlying non-Hermitian particle-hole symmetry. This general finding explains the previous observation in parity-time symmetric systems where non-Hermitian particle-hole symmetry is hidden. We further discuss the defect states in these systems, whose emergence can be viewed as an unconventional alignment of a pseudo-spin under the influence of a complex-valued pseudo-magnetic field. These defect states also behave as a chain with two types of links, one rigid in a unit cell and one soft between unit cells, as the defect states become increasingly localized with the gain and loss strength. A realistic photonic design is presented based on coupled InP/InGaAsP waveguides, and we also extend the discussion to two- and three-dimensional lattices.

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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