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arXiv · 1811.05801

Tunable space-time crystal in room-temperature magnetodielectrics

Alexander J. E. Kreil·Halyna Yu. Musiienko-Shmarova·Dmytro A. Bozhko·Anna Pomyalov·Victor S. L'vov·Sebastian Eggert·Alexander A. Serga·Burkard Hillebrands
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Abstract

We report the experimental realization of a space-time crystal with tunable periodicity in time and space in the magnon Bose-Einstein Condensate (BEC), formed in a room-temperature Yttrium Iron Garnet (YIG) film by radio-frequency space-homogeneous magnetic field. The magnon BEC is prepared to have a well defined frequency and non-zero wavevector. We demonstrate how the crystalline "density" as well as the time and space textures of the resulting crystal may be tuned by varying the experimental parameters: external static magnetic field, temperature, thickness of the YIG film and power of the radio-frequency field. The proposed space-time crystals provide a new dimension for exploring dynamical phases of matter and can serve as a model nonlinear Floquet system, that brings in touch the rich fields of classical nonlinear waves, magnonics and periodically driven systems.

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Alexander J. E. Kreil, Halyna Yu. Musiienko-Shmarova, Dmytro A. Bozhko, Anna Pomyalov, Victor S. L'vov, Sebastian Eggert, Alexander A. Serga, Burkard Hillebrands. 2018-11-14. Tunable space-time crystal in room-temperature magnetodielectrics. https://doi.org/10.1103/physrevb.100.020406

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