Magnon-polaritons condensates with superfluidity and vortex formation

Research output: Contribution to journalConference articlepeer-review

Abstract

The avoided crossing modes arising from the strong coupling between photons and dipole-carrying excitations of a material are well known as a polariton. The situation when dipole-carrying excitations are in a high-quality resonator, dramatically changes the behavior. In a case of exciton-polaritons, it leads to sustained trapping of the emitted photon. Such strong-coupling modes can appear as composite bosons with the spontaneous formation of quantized vortices in the condensed phase of a polariton fluid. We show that magnon-polaritons can be realized due to magnon condensation caused by magnetic dipole-dipole interaction. We study quantized vortices in magnonpolariton condensates arising from magnetic-dipolar-mode (MDM) oscillations in a quasi-2D ferrite disk placed in a microwave cavity. We show that is possible to trap a magnon Bose-Einstein condensate in a ring geometry and induce rotational superflow in this system. We have a spinor dipolar BEC. We observe a persistent current in spinor condensates. A spinor transforms to its negative when the space is continuously rotated through a complete turn from 0° to 360°. Electric dipoles in a YIG disk are described by a vector order parameter and therefore exhibits spontaneous symmetry breaking. Such a “magnetic ordering” is exhibited as a spinor Bose–Einstein condensate. We consider torque transfer induced by MDM oscillations. The resulting configurations show transfer between spin and orbital angular momentum in the form of Einstein-de Hass effect, and novel topological properties. We propose the concept of using magnetoelectric (ME) vortices as topologically stable microwave-signal carriers in long-range ordered dielectric materials.

Original languageEnglish
Pages (from-to)318
Number of pages1
JournalInternational Conference on Metamaterials, Photonic Crystals and Plasmonics
StatePublished - 1 Jan 2021
Event11th International Conference on Metamaterials, Photonic Crystals and Plasmonics, META 2021 - Warsaw, Poland
Duration: 20 Jul 202123 Jul 2021

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Materials Science (miscellaneous)
  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry

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