Dilute Bose-Einstein condensate with large scattering length.

Journal Article (Journal Article)

We study a dilute Bose gas of atoms whose scattering length a is large compared to the range of their interaction. We calculate the energy density E of a homogeneous Bose-Einstein condensate (BEC) to second order in the low-density expansion, expressing it in terms of a and a second parameter Lambda* that determines the low-energy observables in the three-body sector. The second-order correction to E has a small imaginary part that reflects the instability due to three-body recombination. In the case of a trapped BEC with large negative a, we calculate the coefficient of the three-body mean-field term in E in terms of a and Lambda*. It can be very large if there is an Efimov state near threshold.

Full Text

Duke Authors

Cited Authors

  • Braaten, E; Hammer, H-W; Mehen, T

Published Date

  • January 2002

Published In

Volume / Issue

  • 88 / 4

Start / End Page

  • 040401 -

PubMed ID

  • 11801094

Electronic International Standard Serial Number (EISSN)

  • 1079-7114

International Standard Serial Number (ISSN)

  • 0031-9007

Digital Object Identifier (DOI)

  • 10.1103/physrevlett.88.040401


  • eng