Comparing Contact and Dipolar Interactions in a Bose-Einstein Condensate

Anno: 2006

Autori: Griesmeier A., Stuhler J., Koch T., Fattori M., Pfau T., Giovanazzi S.

Affiliazione autori: 5. Physikalisches Institut, Universität Stuttgart, 70550 Stuttgart, Germany

Abstract: We have measured the relative strength edd of the magnetic dipole-dipole interaction compared with the contact interaction in a dipolar chromium Bose-Einstein condensate. We analyze the asymptotic velocities of expansion of the condensate with different orientations of the atomic magnetic moments. By comparing the experimental results with numerical solutions of the hydrodynamic equations for dipolar condensates, we obtain edd=0. 159±0.034. We use this result to determine the s-wave scattering length a=(5.08±1.06×10-9)m=(96±20)a0 of Cr52. This is fully consistent with our previous measurements on the basis of Feshbach resonances and therefore confirms the validity of the theoretical approach used to describe the dipolar Bose-Einstein condensate.

Giornale/Rivista: PHYSICAL REVIEW LETTERS

Volume: 97 (25)      Da Pagina: 250402-1  A: 250402-4

Parole chiavi: Hydrodynamics; Magnetic moments; Magnetism; Mathematical models; Resonance; Velocity measurement, Bose-Einstein condensate; Hydrodynamic equations; Magnetic dipole-dipole interactions, Gas condensates
DOI: 10.1103/PhysRevLett.97.250402

Citazioni: 114
dati da “WEB OF SCIENCE” (of Thomson Reuters) aggiornati al: 2024-05-12
Riferimenti tratti da Isi Web of Knowledge: (solo abbonati)
Link per visualizzare la scheda su IsiWeb: Clicca qui
Link per visualizzare la citazioni su IsiWeb: Clicca qui