Nonlinear tuning of PT symmetry and non-Hermitian topological states

doi:10.1126/science.abf6873

GSTDTAP > 气候变化

DOI	10.1126/science.abf6873
	Nonlinear tuning of PT symmetry and non-Hermitian topological states
	Shiqi Xia; Dimitrios Kaltsas; Daohong Song; Ioannis Komis; Jingjun Xu; Alexander Szameit; Hrvoje Buljan; Konstantinos G. Makris; Zhigang Chen
	2021-04-02
发表期刊	Science
出版年	2021
英文摘要	Controlling the topological properties of physical systems provides a platform for developing devices and technology that are robust to defects. Xia et al. present a photonic platform in which the underlying dynamics are driven and tuned by the interplay among topology, non-Hermiticity, and nonlinearity (see the Perspective by Roztocki and Morandotti). Using photonic lattices consisting of laser-written waveguides that are continuous (“gain”) and sectioned (“loss”) and coupled to an interface defect, they demonstrate the nonlinear control of parity-time symmetry and nonlinearity-induced restoration and/or destruction of non-Hermitian topological states. Such concepts are applicable to a broad spectrum of non-Hermitian systems that have intensity-dependent gain or loss and may enable new approaches for light manipulation. Science , this issue p. [72][1]; see also p. [32][2] Topology, parity-time (PT) symmetry, and nonlinearity are at the origin of many fundamental phenomena in complex systems across the natural sciences, but their mutual interplay remains unexplored. We established a nonlinear non-Hermitian topological platform for active tuning of PT symmetry and topological states. We found that the loss in a topological defect potential in a non-Hermitian photonic lattice can be tuned solely by nonlinearity, enabling the transition between PT-symmetric and non–PT-symmetric regimes and the maneuvering of topological zero modes. The interaction between two apparently antagonistic effects is revealed: the sensitivity close to exceptional points and the robustness of non-Hermitian topological states. Our scheme using single-channel control of global PT symmetry and topology via local nonlinearity may provide opportunities for unconventional light manipulation and device applications. [1]: /lookup/doi/10.1126/science.abf6873 [2]: /lookup/doi/10.1126/science.abg5441
领域	气候变化 ; 资源环境
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文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/321138
专题	气候变化资源环境科学
推荐引用方式 GB/T 7714	Shiqi Xia,Dimitrios Kaltsas,Daohong Song,et al. Nonlinear tuning of PT symmetry and non-Hermitian topological states[J]. Science,2021.
APA	Shiqi Xia.,Dimitrios Kaltsas.,Daohong Song.,Ioannis Komis.,Jingjun Xu.,...&Zhigang Chen.(2021).Nonlinear tuning of PT symmetry and non-Hermitian topological states.Science.
MLA	Shiqi Xia,et al."Nonlinear tuning of PT symmetry and non-Hermitian topological states".Science (2021).