Experimental Observation of PT Symmetry Breaking near Divergent Exceptional Points

M. Sakhdari, M. Hajizadegan, Q. Zhong, D. N. Christodoulides, R. El-Ganainy, and P.-Y. Chen
Phys. Rev. Lett. 123, 193901 – Published 7 November 2019
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Abstract

Standard exceptional points (EPs) are non-Hermitian degeneracies that occur in open systems. At an EP, the Taylor series expansion becomes singular and fails to converge—a feature that was exploited for several applications. Here, we theoretically introduce and experimentally demonstrate a new class of parity-time symmetric systems [implemented using radio frequency (rf) circuits] that combine EPs with another type of mathematical singularity associated with the poles of complex functions. These nearly divergent exceptional points can exhibit an unprecedentedly large eigenvalue bifurcation beyond those obtained by standard EPs. Our results pave the way for building a new generation of telemetering and sensing devices with superior performance.

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  • Received 8 July 2019
  • Revised 5 September 2019

DOI:https://doi.org/10.1103/PhysRevLett.123.193901

© 2019 American Physical Society

Physics Subject Headings (PhySH)

  1. Physical Systems
  1. Properties
Atomic, Molecular & OpticalCondensed Matter, Materials & Applied PhysicsGeneral PhysicsNonlinear Dynamics

Authors & Affiliations

M. Sakhdari1, M. Hajizadegan1, Q. Zhong2, D. N. Christodoulides3, R. El-Ganainy2,*, and P.-Y. Chen1,†

  • 1Department of Electrical and Computer Engineering, University of Illinois at Chicago, Chicago, Illinois 60607, USA
  • 2Department of Physics and Henes Center for Quantum Phenomena, Michigan Technological University, Houghton, Michigan, 49931, USA
  • 3College of Optics & Photonics-CREOL, University of Central Florida, Orlando, Florida 32816, USA

  • *Corresponding author. ganainy@mtu.edu
  • Corresponding author. pychen@uic.edu

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Issue

Vol. 123, Iss. 19 — 8 November 2019

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