Motion of a heavy impurity through a Bose-Einstein condensate
- Dipartimento di Fisica, Universita di Trento and Istituto Nazionale per la Fisica della Materia, I-38050 Povo, Trento (Italy)
We study the motion of a pointlike impurity in a Bose-Einstein condensate at T=0. By solving the Guinier-Preston (GP) equation in a perturbative manner we calculate the induced mass of the impurity and the drag force on the impurity in three-, two-, and one-dimensional (1D) cases. The relationship between the induced mass and the normal mass of fluid is found, and coincides with the result of the Bogoliubov theory. The drag force appears for the supersonic motion of the impurity. In 1D the drag force is investigated also on the basis of the exact Lieb-Liniger theory, using the dynamic form factor, which has been evaluated by the Haldane method of the calculation of correlation functions. In this theory the force appears for an arbitrarily small velocity of the impurity. The possibility of measuring the form factor in existing experiments is noted.
- OSTI ID:
- 20645788
- Journal Information:
- Physical Review. A, Vol. 70, Issue 1; Other Information: DOI: 10.1103/PhysRevA.70.013608; (c) 2004 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
- Country of Publication:
- United States
- Language:
- English
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