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Area of Science:

  • Condensed matter physics
  • Quantum optics
  • Magnonics

Background:

  • Time-varying media enable wave manipulation by breaking temporal translation symmetry.
  • Exploring time-varying phenomena in magnonic systems is challenging due to difficulties in rapidly altering magnon dispersion.

Purpose of the Study:

  • To investigate time-varying strong coupling in magnonic systems.
  • To demonstrate novel phenomena like chirped oscillations and time diffraction of magnons.

Main Methods:

  • Constructing a time-varying strong coupling between two magnon modes.
  • Utilizing time-resolved frequency-comb spectroscopy to characterize magnon frequency conversion.
  • Creating time slits with adjacent interfaces to demonstrate double-slit time diffraction.

Main Results:

  • Observed chirped Rabi-like oscillations at the edges of time-varying pulses.
  • Characterized frequency conversion of magnon modes induced by time-varying strong coupling.
  • Demonstrated, for the first time, double-slit time diffraction of magnon modes.

Conclusions:

  • Time-varying strong coupling is a viable mechanism for manipulating magnons.
  • The observed phenomena are independent of device reconfiguration.
  • Findings pave the way for magnetic mixers and on-chip gigahertz sources.