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- Title
Origin of a nonlinear contribution to the shift of the critical temperature in atomic Bose-Einstein condensates.
- Authors
Sergeenkov, S.; Briscese, F.; Grether, M.; Llano, M.
- Abstract
We discuss a possible origin of the experimentally observed nonlinear contribution to the shift Δ T = T − T of the critical temperature T in an atomic Bose-Einstein condensate (BEC) with respect to the critical temperature T of an ideal gas. We found that accounting for a nonlinear (quadratic) Zeeman effect (with applied magnetic field closely matching a Feshbach resonance field B) in the mean-field approximation results in a rather significant renormalization of the field-free nonlinear contribution b, namely, T/ T ≃ b* ( a/λ) (where a is the s-wave scattering length, λ is the thermal wavelength at T) with b* = γ b and γ = γ( B). In particular, we predict b* ≃ 42.3 for the B ≃ 403 G resonance observed in the K BEC.
- Subjects
BOSE-Einstein condensation; IDEAL gases; TEMPERATURE measurements; MAGNETIC fields; RENORMALIZATION (Physics)
- Publication
JETP Letters, 2015, Vol 101, Issue 6, p376
- ISSN
0021-3640
- Publication type
Article
- DOI
10.1134/S0021364015060119