Dilute Bose-Einstein Condensate with Large Scattering Length


Journal Article

We study a dilute Bose gas of atoms whose scattering length [Formula presented] is large compared to the range of their interaction. We calculate the energy density [Formula presented] of a homogeneous Bose-Einstein condensate (BEC) to second order in the low-density expansion, expressing it in terms of [Formula presented] and a second parameter [Formula presented] that determines the low-energy observables in the three-body sector. The second-order correction to [Formula presented] has a small imaginary part that reflects the instability due to three-body recombination. In the case of a trapped BEC with large negative [Formula presented], we calculate the coefficient of the three-body mean-field term in [Formula presented] in terms of [Formula presented] and [Formula presented]. It can be very large if there is an Efimov state near threshold. © 2002 The American Physical Society.

Full Text

Duke Authors

Cited Authors

  • Braaten, E; Hammer, HW; Mehen, T

Published Date

  • January 1, 2002

Published In

Volume / Issue

  • 88 / 4

Start / End Page

  • 4 -

Electronic International Standard Serial Number (EISSN)

  • 1079-7114

International Standard Serial Number (ISSN)

  • 0031-9007

Digital Object Identifier (DOI)

  • 10.1103/PhysRevLett.88.040401

Citation Source

  • Scopus