Observation of Weyl exceptional rings in thermal diffusion

doi:10.1073/pnas.2110018119

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	Observation of Weyl exceptional rings in thermal diffusion
	G. Q. Xu; W. Li; X. Zhou; H. G. Li; Y. Li; S. H. Fan; S. Zhang; D. N. Christodoulides and C. W. Qiu
	2022
发表期刊	Proceedings of the National Academy of Sciences of the United States of America
ISSN	0027-8424
卷号	119 期号:15 页码:7
摘要	A non-Hermitian Weyl equation indispensably requires a three-dimensional (3D) real/synthetic space, and it is thereby perceived that a Weyl exceptional ring (WER) will not be present in thermal diffusion given its purely dissipative nature. Here, we report a recipe for establishing a 3D parameter space to imitate thermal spinor field. Two orthogonal pairs of spatiotemporally modulated advections are employed to serve as two synthetic parameter dimensions, in addition to the inherent dimension corresponding to heat exchanges. We first predict the existence of WER in our hybrid conduction-advection system and experimentally observe the WER thermal signatures verifying our theoretical prediction. When coupling two WERs of opposite topological charges, the system further exhibits surface-like and bulk topological states, manifested as stationary and continuously changing thermal processes, respectively, with good robustness. Our findings reveal the long-ignored topological nature in thermal diffusion and may empower distinct paradigms for general diffusion and dissipation controls.
DOI	10.1073/pnas.2110018119
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收录类别	sci
语种	英语
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文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/66927
专题	中国科学院长春光学精密机械与物理研究所
推荐引用方式 GB/T 7714	G. Q. Xu,W. Li,X. Zhou,et al. Observation of Weyl exceptional rings in thermal diffusion[J]. Proceedings of the National Academy of Sciences of the United States of America,2022,119(15):7.
APA	G. Q. Xu.,W. Li.,X. Zhou.,H. G. Li.,Y. Li.,...&D. N. Christodoulides and C. W. Qiu.(2022).Observation of Weyl exceptional rings in thermal diffusion.Proceedings of the National Academy of Sciences of the United States of America,119(15),7.
MLA	G. Q. Xu,et al."Observation of Weyl exceptional rings in thermal diffusion".Proceedings of the National Academy of Sciences of the United States of America 119.15(2022):7.

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