Multi-band Bose-Einstein condensate at four-particle scattering
resonance
- URL: http://arxiv.org/abs/2201.11043v1
- Date: Wed, 26 Jan 2022 16:32:58 GMT
- Title: Multi-band Bose-Einstein condensate at four-particle scattering
resonance
- Authors: Joe Bailey, Pavlo Sukhachov, Korbinian Baumgaertl, Simone Finizio,
Sebastian Wintz, Carsten Dubs, Joerg Raabe, Dirk Grundler, Alexander Balatsky
and Gabriel Aeppli
- Abstract summary: We show that magnon quantization for thin samples results in a new multi-band magnon condensate.
The most stable multi-band condensate is found in a narrow regime favoured on account of a resonance in the scattering between two bands.
- Score: 47.187609203210705
- License: http://creativecommons.org/licenses/by-nc-sa/4.0/
- Abstract: Superfluidity and superconductivity are macroscopic manifestations of quantum
mechanics, which have fascinated scientists since their discoveries roughly a
century ago. Ever since the initial theories of such quantum fluids were
formulated, there has been speculation as to the possibility of multi-component
quantum order. A particularly simple multi-component condensate is built from
particles occupying different quantum states, or bands, prior to condensation.
The particles in one or both bands may undergo condensation, as seen for
certain solids and anticipated for certain cold atom systems. For bulk solids,
the different bands always order simultaneously, with conventional pairing
characterized by complex order parameters describing the condensates in each
band. Another type of condensate, notably occurring at room temperature, has
been identified for magnons, the magnetic analogue of lattice vibrations,
injected by microwaves into yttrium iron garnet. Here we show that magnon
quantization for thin samples results in a new multi-band magnon condensate. We
establish a phase diagram, as a function of microwave drive power and frequency
relative to the magnon bands, revealing both single and multi-band
condensation. The most stable multi-band condensate is found in a narrow regime
favoured on account of a resonance in the scattering between two bands. Our
discovery introduces a flexible non-equilibrium platform operating at room
temperature for a well-characterised material, exploiting a Feshbach-like
resonance, for examining multi-band phenomena. It points to qualitatively new
ways to engineer and control condensates and superconducting states in
multiband systems and potential devices containing multiple interacting
condensates.
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