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

Abstract

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. 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.

Authors:
 [1];  [2];  [1];  [1];  [1]
  1. Argonne National Lab. (ANL), Argonne, IL (United States). Center for Nanoscale Materials
  2. Imperial College London, London (United Kingdom). Blackett Lab.
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Center for Nanoscale Materials
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Scientific User Facilities Division
OSTI Identifier:
1577099
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 123; Journal Issue: 23; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Zhang, Xufeng, Ding, Kun, Zhou, Xianjing, Xu, Jing, and Jin, Dafei. Experimental Observation of an Exceptional Surface in Synthetic Dimensions with Magnon Polaritons. United States: N. p., 2019. Web. doi:10.1103/PhysRevLett.123.237202.
Zhang, Xufeng, Ding, Kun, Zhou, Xianjing, Xu, Jing, & Jin, Dafei. Experimental Observation of an Exceptional Surface in Synthetic Dimensions with Magnon Polaritons. United States. doi:10.1103/PhysRevLett.123.237202.
Zhang, Xufeng, Ding, Kun, Zhou, Xianjing, Xu, Jing, and Jin, Dafei. Wed . "Experimental Observation of an Exceptional Surface in Synthetic Dimensions with Magnon Polaritons". United States. doi:10.1103/PhysRevLett.123.237202.
@article{osti_1577099,
title = {Experimental Observation of an Exceptional Surface in Synthetic Dimensions with Magnon Polaritons},
author = {Zhang, Xufeng and Ding, Kun and Zhou, Xianjing and Xu, Jing and Jin, Dafei},
abstractNote = {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. 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.},
doi = {10.1103/PhysRevLett.123.237202},
journal = {Physical Review Letters},
number = 23,
volume = 123,
place = {United States},
year = {2019},
month = {12}
}

Journal Article:
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