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Title: Comparing Contact and Dipolar Interactions in a Bose-Einstein Condensate

Abstract

We have measured the relative strength {epsilon}{sub dd} 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 {epsilon}{sub dd}=0.159{+-}0.034. We use this result to determine the s-wave scattering length a=(5.08{+-}1.06x10{sup -9}) m=(96{+-}20) a{sub 0} of {sup 52}Cr. 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.

Authors:
; ; ; ; ;  [1]
  1. 5. Physikalisches Institut, Universitaet Stuttgart, 70550 Stuttgart (Germany)
Publication Date:
OSTI Identifier:
20861510
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 97; Journal Issue: 25; Other Information: DOI: 10.1103/PhysRevLett.97.250402; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; BOSE-EINSTEIN CONDENSATION; CHROMIUM; CHROMIUM 52; CONDENSATES; EQUATIONS; MAGNETIC DIPOLES; MAGNETIC MOMENTS; NUMERICAL SOLUTION; RESONANCE; S WAVES; SCATTERING LENGTHS; VELOCITY

Citation Formats

Griesmaier, Axel, Stuhler, Juergen, Koch, Tobias, Fattori, Marco, Pfau, Tilman, and Giovanazzi, Stefano. Comparing Contact and Dipolar Interactions in a Bose-Einstein Condensate. United States: N. p., 2006. Web. doi:10.1103/PHYSREVLETT.97.250402.
Griesmaier, Axel, Stuhler, Juergen, Koch, Tobias, Fattori, Marco, Pfau, Tilman, & Giovanazzi, Stefano. Comparing Contact and Dipolar Interactions in a Bose-Einstein Condensate. United States. doi:10.1103/PHYSREVLETT.97.250402.
Griesmaier, Axel, Stuhler, Juergen, Koch, Tobias, Fattori, Marco, Pfau, Tilman, and Giovanazzi, Stefano. Fri . "Comparing Contact and Dipolar Interactions in a Bose-Einstein Condensate". United States. doi:10.1103/PHYSREVLETT.97.250402.
@article{osti_20861510,
title = {Comparing Contact and Dipolar Interactions in a Bose-Einstein Condensate},
author = {Griesmaier, Axel and Stuhler, Juergen and Koch, Tobias and Fattori, Marco and Pfau, Tilman and Giovanazzi, Stefano},
abstractNote = {We have measured the relative strength {epsilon}{sub dd} 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 {epsilon}{sub dd}=0.159{+-}0.034. We use this result to determine the s-wave scattering length a=(5.08{+-}1.06x10{sup -9}) m=(96{+-}20) a{sub 0} of {sup 52}Cr. 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.},
doi = {10.1103/PHYSREVLETT.97.250402},
journal = {Physical Review Letters},
number = 25,
volume = 97,
place = {United States},
year = {Fri Dec 22 00:00:00 EST 2006},
month = {Fri Dec 22 00:00:00 EST 2006}
}