Bose-Einstein condensation at finite momentum and magnon condensation in thin film ferromagnets
arXiv:1007.3200 · doi:10.1140/epjb/e2010-10596-7
Abstract
We use the Gross-Pitaevskii equation to determine the spatial structure of the condensate density of interacting bosons whose energy dispersion epsilon_k has two degenerate minima at finite wave-vectors q. We show that in general the Fourier transform of the condensate density has finite amplitudes for all integer multiples of q. If the interaction is such that many Fourier components contribute, the Bose condensate is localized at the sites of a one-dimensional lattice with spacing 2pi/q; in this case Bose-Einstein condensation resembles the transition from a liquid to a crystalline solid. We use our results to investigate the spatial structure of the Bose condensate formed by magnons in thin films of ferromagnets with dipole-dipole interactions.
arXiv comment9 pages, 4 figures, final version publicated in EPJD
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- Thermalization of magnons in yttrium-iron garnet: nonequilibrium functional renormalization group approach
- Microscopic dynamics and Bose-Einstein condensation in liquid helium
- Anisotropy-assisted magnon condensation in ferromagnetic thin films
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- Collisionless kinetic theory for parametrically pumped magnons
- Symmetry-protected Bose-Einstein condensation of interacting hardcore Bosons
- Accumulation of magnetoelastic bosons in yttrium iron garnet: kinetic theory and wave vector resolved Brillouin light scattering