Hydrodynamic modes of partially condensed Bose mixtures

Abstract

We generalize the Landau-Khalatnikov hydrodynamic theory for superfluid helium to two-component (binary) Bose mixtures at arbitrary temperatures. In particular, we include the spin-drag terms that correspond to viscous coupling between the clouds. Therefore, our theory not only describes the usual collective modes of the individual components, e.g., first and second sound, but also results in new collective modes, where both constituents participate. We study these modes in detail and present their dispersions using thermodynamic quantities obtained within the Popov approximation.

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• Observation of Spin Superfluidity in a Bose Gas Mixture
• Spin-Dipole Oscillation and Polarizability of a Binary Bose-Einstein Condensate near the Miscible-Immiscible Phase Transition
• Magnetic phase transition in a mixture of two interacting Bose gases at finite temperature
• Low-Dimensional Self-Bound Quantum Rabi-Coupled Bosonic Droplets
• Quantum hydrodynamics of the spinor Bose-Einstein condensate at non-zero temperatures
• Equation of state of the one- and three-dimensional Bose-Bose gases
• Finite temperature spin dynamics of a two-dimensional Bose-Bose atomic mixture
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• Anomalous Doppler effect in two-component Bose-Einstein condensates