Critical velocities in two-component superfluid Bose gases

Abstract

On the ground of the Landau criterion we study the behavior of critical velocities in a superfluid two-component Bose gas. It is found that under motion of the components with different velocities the velocity of each component should not be lower than a minimum phase velocity of elementary excitations (s_). The Landau criterion yields a relation between the critical velocities of the components (v_{c1}, v_{c2}). The velocity of one or even both components may exceed s_. The maximum value of the critical velocity of a given component can be reached when the other component does not move. The approach is generalized for a two-component condensate confined in a cylindrical harmonic potential. PACS numbers: 03.75.Kk,03.75.Mn

6 pages, 1 figures

References in corpus (14)

• The dynamics of component separation in a binary mixture of Bose-Einstein condensates
• A two atomic species superfluid
• Observation of metastable states in spinor Bose-Einstein condensates
• Quantum simulation of cosmic inflation in two-component Bose-Einstein condensates
• Collective oscillations of two colliding Bose-Einstein condensates
• Sympathetic Cooling with Two Atomic Species in an Optical Trap
• Critical Velocity of Superfluid Flow past Large Obstacles in Bose-Condensates
• Critical velocity in cylindrical Bose-Einstein condensates
• Non-dissipative drag of superflow in a two-component Bose gas
• Local vortex nucleation and the surface mode spectrum of large condensates
• The Surface of a Bose-Einstein Condensed Atomic Cloud
• Andreev-Bashkin effect and knot solitons in interacting mixture of a charged and a neutral superfuids with possible releveance for neutron stars
• "Cherenkov radiation" of a sound in a Bose-condensed gas
• Collective excitations of a two-dimensional interacting Bose gas in anti-trap and linear external potentials

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• Critical currents and giant non-dissipative drag for superfluid electron-hole pairs in quantum Hall multilayers
• Frictionless flow in a binary polariton superfluid
• Stationary waves in a superfluid exciton gas in quantum Hall bilayers
• Superfluidity of a rarefied gas of electron-hole pairs in a bilayer system
• Probing phase-separation in Bose-Fermi mixtures by the critical superfluid velocity