Experimental Observation of an Exceptional Surface in Synthetic Dimensions with Magnon Polaritons

Zhang, Xufeng; Ding, Kun; Zhou, Xianjing; Xu, Jing; Jin, Dafei

doi:10.1103/PhysRevLett.123.237202

Title: Experimental Observation of an Exceptional Surface in Synthetic Dimensions with Magnon Polaritons

Journal Article · 04 December 2019 · Physical Review Letters

DOI: https://doi.org/10.1103/PhysRevLett.123.237202 · OSTI ID:1632152

Zhang, Xufeng ^[1]; Ding, Kun ^[2]; Zhou, Xianjing ^[1]; Xu, Jing ^[1]; Jin, Dafei ^[1]

Argonne National Lab. (ANL), Argonne, IL (United States). Center for Nanoscale Materials
Imperial College London, London (United Kingdom). Blackett Lab.

Exceptional points (EPs) are singularities of energy levels in generalized eigenvalue systems. In this Letter, we demonstrate the surface of EPs on a magnon polariton platform composed of coupled magnons and microwave photons. Our experiments show that EPs form a three-dimensional exceptional surface (ES) when the system is tuned in a four-dimensional synthetic space. Here, we demonstrate that there exists an exceptional saddle point (ESP) in the ES which originates from the unique couplings between magnons and microwave photons. Such an ESP exhibits unique anisotropic behaviors in both the real and imaginary parts of the eigenfrequencies. To the best of our knowledge, this is the first experimental observation of ES, opening up new opportunities for high-dimensional control of non-Hermitian systems.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division; Gordon and Betty Moore Foundation

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1632152

Alternate ID(s):: OSTI ID: 1577099

Journal Information:: Physical Review Letters, Vol. 123, Issue 23; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 93 works

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