Enhancement of magnonic frequency combs by exceptional points

Frequency combs have high time–frequency accuracy, which makes them useful for applications in precision spectroscopy, ultra-sensitive detection and atomic clocks. Traditional methods of creating frequency combs hinge on material nonlinearities, which are often weak. These methods require high power...

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Bibliographic Details
Published in:Nature physics 2024-07, Vol.20 (7), p.1139-1144
Main Authors: Wang, Congyi, Rao, Jinwei, Chen, Zhijian, Zhao, Kaixin, Sun, Liaoxin, Yao, Bimu, Yu, Tao, Wang, Yi-Pu, Lu, Wei
Format: Article
Language:English
Subjects:
639/766/119/1001
639/766/119/2793
639/766/119/997
Atomic
Atomic clocks
Classical and Continuum Physics
Complex Systems
Condensed Matter Physics
Coupled modes
Magnetic fields
Magnons
Mathematical and Computational Physics
Molecular
Nonlinearity
Optical and Plasma Physics
Physics
Physics and Astronomy
Spectroscopy
Spectrum analysis
Theoretical
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Summary:Frequency combs have high time–frequency accuracy, which makes them useful for applications in precision spectroscopy, ultra-sensitive detection and atomic clocks. Traditional methods of creating frequency combs hinge on material nonlinearities, which are often weak. These methods require high power densities to surpass their initiation thresholds, subsequently limiting their potential use. Here we demonstrate a nonlinear coupling process that efficiently generates magnonic frequency combs by exploiting exceptional points in a coupled system of two different magnon modes. Our approach is a simple and optimal path to produce magnonic frequency combs at low pump power with excellent tunability of exceptional points. Frequency combs, which are important for applications in precision spectroscopy, depend on material nonlinearities for their function, which can be hard to engineer. Now an approach combining magnons and exceptional points is shown to be effective.
ISSN:1745-2473
1745-2481
DOI:10.1038/s41567-024-02478-0