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TWO-SUPERFLUID MODEL OF TWO-COMPONENT BOSE-EINSTEIN CONDENSATES

Lu Hong-Yan

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Abstract

Superfluid 4He at a finite temperature is described by the two-fluid model with the normal fluid component and the superfluid component.We formulate the two-fluid model for two-component BECs,namely two-superfluid model,starting from the coupled Gross-Pitaevskii equations.The two-superfluid model well corresponds to the two-fluid model in superfluid 4He.In a special condition,the two sound modes in the two-superfluid model behave like first and second sounds in the two-fluid model of superfluid 4He.

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What this paper is about

Superfluid 4He at a finite temperature is described by the two-fluid model with the normal fluid component and the superfluid component.We formulate the two-fluid model for two-component BECs,namely two-superfluid model,starting from the coupled Gross-Pitaevskii equations.The two-superfluid model well corresponds to the two-fluid model in superfluid 4He.In a special condition,the two sound modes in the two-superfluid model behave like first and second sounds in the two-fluid model of superfluid 4He.

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Available abstract

Superfluid 4He at a finite temperature is described by the two-fluid model with the normal fluid component and the superfluid component.We formulate the two-fluid model for two-component BECs,namely two-superfluid model,starting from the coupled Gross-Pitaevskii equations.The two-superfluid model well corresponds to the two-fluid model in superfluid 4He.In a special condition,the two sound modes in the two-superfluid model behave like first and second sounds in the two-fluid model of superfluid 4He.

Key concepts: Superfluidity, Physics, Component (thermodynamics), Two-fluid model, Quantum vortex, Roton, Superfluid film, Bose–Einstein condensate

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