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Non-Hermitian control between absorption and transparency in perfect zero-reflection magnonics.

Jie Qian1,2, C H Meng1, J W Rao3

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This study reveals zero-reflection (ZR) states in complex frequency for indirectly coupled two-magnon systems. These perfect-ZR states offer tunable absorption and transmission, advancing metamaterial applications.

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Area of Science:

  • Metamaterials and transformation optics
  • Non-Hermitian physics

Background:

  • Open systems in metamaterials exhibit exotic properties like perfect absorption/transmission and cloaking.
  • Non-Hermitian physics describes open systems, but reflection characteristics in the complex frequency plane are under-explored.
  • Zero-reflection (ZR) states are crucial for various applications.

Purpose of the Study:

  • To demonstrate zero-reflection (ZR) states in the complex frequency plane for indirectly coupled two-magnon systems.
  • To investigate non-Hermitian eigenmode hybridization and its relation to ZR states.
  • To explore the tunability of absorption and transmission using these ZR states.

Main Methods:

  • Theoretical investigation of indirectly coupled two-magnon systems.
  • Analysis of reflection characteristics in the complex frequency plane.
  • Characterization of perfect-zero-reflection (PZR) states and their properties.

Main Results:

  • Demonstrated non-Hermitian eigenmode hybridization in the two-magnon system.
  • Observed zero-reflection (ZR) states in the complex frequency plane.
  • Identified perfect-ZR (PZR) states with pure real frequencies, exhibiting infinitely narrow reflection dips (~67 dB) and infinite group delay discontinuity.
  • Showcased flexible tuning of absorption and transmission from nearly full absorption (NFA) to nearly full transmission (NFT).

Conclusions:

  • Indirectly coupled two-magnon systems can exhibit both non-Hermitian eigenmode hybridization and ZR states.
  • PZR states represent a distinct reflection singularity, tunable relative to resonant eigenstates.
  • The findings enable flexible control over absorption and transmission, with potential applications in metamaterials and open systems.