Stability of a Bose-Einstein condensate in an anharmonic trap

Journal Article · Fri May 15 04:00:00 EDT 2009 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.79.053629· OSTI ID:21304745

Chakrabarti, Barnali ^[1]; Das, T K ^[2]; Debnath, P K ^[3]

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1. Department of Physics, Lady Brabourne College, P-1/2 Suhrawardy Avenue, Calcutta 700017 (India)
2. Department of Physics, University of Calcutta, 92 A.P.C. Road, Calcutta 700009 (India)
3. Santoshpur Sri Gouranga Vidyapith (H.S.), P.O. Kulitapara, Howrah 711312 (India)

We study the stability of Bose-Einstein condensate (BEC) with repulsive and attractive interatomic interactions in a harmonic plus quartic trap [V(r)=(1/2)m{omega}{sup 2}r{sup 2}+{lambda}r{sup 4}]. We find that BEC with repulsive interaction becomes more stable for {lambda}>0. For {lambda}<0, we observe a different metastability of the condensate even when the scattering length is positive. For BEC with attractive interaction, we observe dramatic change in the stability factor (A{sub cr}|a{sub sc}|/a{sub ho}) due to the anharmonicity. The frequencies of the collective excitations are also modified by the atomic interaction and by the anharmonicity.

• OSTI ID: 21304745
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 5 Vol. 79; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BOSE-EINSTEIN CONDENSATION
COLLECTIVE EXCITATIONS
INTERACTIONS
RADIATION PRESSURE
SCATTERING LENGTHS
STABILITY
TRAPS