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

Nick Träger, Paweł Gruszecki, Filip Lisiecki, Felix Groß, Johannes Förster, Markus Weigand, Hubert Głowiński, Piotr Kuświk, Janusz Dubowik, Gisela Schütz, Maciej Krawczyk, and Joachim Gräfe
Phys. Rev. Lett. 126, 057201 – Published 3 February 2021
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Abstract

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 formation of the STC, micromagnetic simulations are carefully adapted to model the experimental findings. Beyond the mere generation of a STC, we observe the formation of a magnonic band structure due to back folding of modes at the STC’s Brillouin zone boundaries. We show interactions of magnons with the STC that appear as lattice scattering, which results in the generation of ultrashort spin waves (SW) down to 100-nm wavelengths that cannot be described by classical dispersion relations for linear SW excitation. We expect that room-temperature STCs will be useful to investigate nonlinear wave physics, as they can be easily generated and manipulated to control their spatial and temporal band structures.

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  • Received 17 March 2020
  • Revised 14 August 2020
  • Accepted 9 December 2020

DOI:https://doi.org/10.1103/PhysRevLett.126.057201

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Open access publication funded by the Max Planck Society.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Statistical Physics & ThermodynamicsNonlinear DynamicsQuantum Information, Science & TechnologyGeneral PhysicsCondensed Matter, Materials & Applied Physics

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Making Space-Time Crystals Using Magnons

Published 3 February 2021

Electron spin waves condense to form an exotic new state that repeats in both space and time.

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Authors & Affiliations

Nick Träger1,*, Paweł Gruszecki2, Filip Lisiecki3, Felix Groß1, Johannes Förster1, Markus Weigand1,4, Hubert Głowiński3, Piotr Kuświk3, Janusz Dubowik3, Gisela Schütz1, Maciej Krawczyk2, and Joachim Gräfe1,†

  • 1Max Planck Institute for Intelligent Systems, Heisenbergstr. 3, 70569 Stuttgart, Germany
  • 2Adam Mickiewicz University, Faculty of Physics, ul. Uniwersytetu Poznańskiego 2, 61-614 Poznań, Poland
  • 3Institute of Molecular Physics, Polish Academy of Sciences, Mariana Smoluchowskiego 17, 60-179 Poznań, Poland
  • 4Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Str. 15, 12489 Berlin, Germany

  • *traeger@is.mpg.de
  • graefe@is.mpg.de

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Issue

Vol. 126, Iss. 5 — 5 February 2021

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