Generating arbitrary topological windings of a non-Hermitian band

doi:10.1126/science.abf6568

GSTDTAP > 气候变化

DOI	10.1126/science.abf6568
	Generating arbitrary topological windings of a non-Hermitian band
	Kai Wang; Avik Dutt; Ki Youl Yang; Casey C. Wojcik; Jelena Vučković; Shanhui Fan
	2021-03-19
发表期刊	Science
出版年	2021
英文摘要	Controlling the topology of a system provides a route to develop devices that are robust against defects. Whereas earlier developments of topological band theory focused on Hermitian (closed) systems, recent efforts have been toward non-Hermitian (open) systems. K. Wang et al. report on the measurement and control of topologically nontrivial windings of a non-Hermitian energy band. By implementing non-Hermitian lattice Hamiltonians along a frequency synthetic dimension formed by optical frequency modes in a modulated ring-resonator, they directly visualized the nontrivial topological band winding and showed that the winding can be controlled. Such control provides a route for the experimental synthesis, characterization, and control of topologically nontrivial phases in open physical systems. Science , this issue p. [1240][1] The nontrivial topological features in the energy band of non-Hermitian systems provide promising pathways to achieve robust physical behaviors in classical or quantum open systems. A key topological feature of non-Hermitian systems is the nontrivial winding of the energy band in the complex energy plane. We provide experimental demonstrations of such nontrivial winding by implementing non-Hermitian lattice Hamiltonians along a frequency synthetic dimension formed in a ring resonator undergoing simultaneous phase and amplitude modulations, and by directly characterizing the complex band structures. Moreover, we show that the topological winding can be controlled by changing the modulation waveform. Our results allow for the synthesis and characterization of topologically nontrivial phases in nonconservative systems. [1]: /lookup/doi/10.1126/science.abf6568
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/319935
专题	气候变化资源环境科学
推荐引用方式 GB/T 7714	Kai Wang,Avik Dutt,Ki Youl Yang,et al. Generating arbitrary topological windings of a non-Hermitian band[J]. Science,2021.
APA	Kai Wang,Avik Dutt,Ki Youl Yang,Casey C. Wojcik,Jelena Vučković,&Shanhui Fan.(2021).Generating arbitrary topological windings of a non-Hermitian band.Science.
MLA	Kai Wang,et al."Generating arbitrary topological windings of a non-Hermitian band".Science (2021).