Three-fluid hydrodynamics of spin-1 Bose-Einstein condensates
- 4 May 2012
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review A
- Vol. 85 (5)
- https://doi.org/10.1103/physreva.85.053603
Abstract
We study excitations of the spin-1 Bose gas at finite temperatures and in the presence of a not-so-strong magnetic field or, equivalently, when the gas sample is partially polarized. Motivated by the success of two-fluid hydrodynamics of scalar superfluids we develop a three-fluid hydrodynamic description to treat the low-frequency and long-wavelength excitations of the spin-1 Bose gas. We derive coupled linear hydrodynamic equations of the three sounds and evaluate them numerically in a self-consistent mean-field approximation valid for dilute gas in the intermediate and critical temperature regions. In this latter region we identify the critical mode.Keywords
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