Real-Space Observation of Magnon Interaction with Driven Space-Time Crystals.

  title={Real-Space Observation of Magnon Interaction with Driven Space-Time Crystals.},
  author={Nick Tr{\"a}ger and Paweł Gruszecki and Filip Lisiecki and Felix Gro{\ss} and Johannes F{\"o}rster and Markus Weigand and Hubert Głowiński and Piotr Kuświk and Janusz Dubowik and Gisela Sch{\"u}tz and Maciej Krawczyk and Joachim Gr{\"a}fe},
  journal={Physical review letters},
  volume={126 5},
The concept of space-time crystals (STC), i.e., translational symmetry breaking in time and space, was recently proposed and experimentally demonstrated for quantum systems. Here, we transfer this concept to magnons and experimentally demonstrate a driven STC at room temperature. The STC is realized by strong homogeneous microwave pumping of a micron-sized permalloy (Py) stripe and is directly imaged by scanning transmission x-ray microscopy (STXM). For a fundamental understanding of the… 
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