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Nonreciprocity and Unidirectional Invisibility in Cavity Magnonics

Yi-Pu Wang, J. W. Rao, Y. Yang, Peng-Chao Xu, Y. S. Gui, B. M. Yao, J. Q. You, and C.-M. Hu
Phys. Rev. Lett. 123, 127202 – Published 18 September 2019
Physics logo See Synopsis: A One-Way Road for Microwaves
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Abstract

We reveal the cooperative effect of coherent and dissipative magnon-photon couplings in an open cavity magnonic system, which leads to nonreciprocity with a considerably large isolation ratio and flexible controllability. Furthermore, we discover unidirectional invisibility for microwave propagation, which appears at the zero-damping condition for hybrid magnon-photon modes. A simple model is developed to capture the generic physics of the interference between coherent and dissipative couplings, which accurately reproduces the observations over a broad range of parameters. This general scheme could inspire methods to achieve nonreciprocity in other systems.

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  • Received 23 June 2019

DOI:https://doi.org/10.1103/PhysRevLett.123.127202

© 2019 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Synopsis

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A One-Way Road for Microwaves

Published 18 September 2019

A simple device controls which direction microwaves travel in a circuit, a critical ingredient for quantum technologies that demand sensitive signal detection.

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Authors & Affiliations

Yi-Pu Wang1,*, J. W. Rao1, Y. Yang1, Peng-Chao Xu1,2, Y. S. Gui1, B. M. Yao3, J. Q. You4, and C.-M. Hu1,†

  • 1Department of Physics and Astronomy, University of Manitoba, Winnipeg, Canada R3T 2N2
  • 2State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China
  • 3State Key Laboratory of Infrared Physics, Chinese Academy of Sciences, Shanghai 200083, People’s Republic of China
  • 4Interdisciplinary Center of Quantum Information and Zhejiang Province Key Laboratory of Quantum Technology and Device, Department of Physics and State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou 310027, China

  • *Yipu.Wang@umanitoba.ca
  • hu@physics.umanitoba.ca

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Issue

Vol. 123, Iss. 12 — 20 September 2019

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