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PreprintarXiv licencearXiv

Floquet Engineering of Momentum Gaps in Magnonic Time Crystals: Slow-Drive Amplification and In-Gap Propagation

  • Paweł Gruszecki
  • Victor Pacheco-Peña
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Abstract

Photonic time crystals host momentum gaps in which waves grow exponentially but cannot propagate. We establish their magnonic counterpart in a thin film with periodically switched anisotropy, deriving its Floquet band structure and confirming it micromagnetically. Gaps require a precession-ellipticity contrast. The waveform controls high-order gaps: a single 1~GHz switching drive amplifies a comb of spin-wave bands, from 2.5 to 4.5~GHz, above Gilbert losses even with smoothed edges, unlike sinusoidal modulation. With the Dzyaloshinskii--Moriya interaction, amplified packets propagate inside the gap while growing.

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Cite

BibTeXRIS
BibTeX
@misc{gruszecki2026floquet,
  title = {{Floquet Engineering of Momentum Gaps in Magnonic Time Crystals: Slow-Drive Amplification and In-Gap Propagation}},
  author = {Paweł Gruszecki and Victor Pacheco-Peña},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.32766},
  eprint = {2610.32766},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.32766},
}
RIS
TY  - UNPB
TI  - Floquet Engineering of Momentum Gaps in Magnonic Time Crystals: Slow-Drive Amplification and In-Gap Propagation
AU  - Paweł Gruszecki
AU  - Victor Pacheco-Peña
PY  - 2026
DA  - 2026/10/23
PB  - arXiv
DO  - 10.48550/arxiv.2610.32766
UR  - https://arxiv.org/abs/2610.32766
AB  - Photonic time crystals host momentum gaps in which waves grow exponentially but cannot propagate. We establish their magnonic counterpart in a thin film with periodically switched anisotropy, deriving its Floquet band structure and confirming it micromagnetically. Gaps require a precession-ellipticity contrast. The waveform controls high-order gaps: a single 1~GHz switching drive amplifies a comb of spin-wave bands, from 2.5 to 4.5~GHz, above Gilbert losses even with smoothed edges, unlike sinusoidal modulation. With the Dzyaloshinskii--Moriya interaction, amplified packets propagate inside the gap while growing.
ER  -