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.
9 pages, 4 figures, final version publicated in EPJD
References in corpus (4)
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- Microscopic spin-wave theory for yttrium-iron garnet films
- Collective fields in the functional renormalization group for fermions, Ward identities, and the exact solution of the Tomonaga-Luttinger model
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Cited by in corpus (12)
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- Non-equilibrium time evolution of bosons from the functional renormalization group
- Thermalization of magnons in yttrium-iron garnet: nonequilibrium functional renormalization group approach
- Correlation-enhanced interaction of a Bose-Einstein condensate with parametric magnon pairs and virtual magnons
- Microscopic dynamics and Bose-Einstein condensation in liquid helium
- Anisotropy-assisted magnon condensation in ferromagnetic thin films
- Effect of magnon decays on parametrically pumped magnons
- Magnon spin capacitor
- Formation of new phase inclusions in the system of quasi-equilibrium magnons of high density
- 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