Physics – Condensed Matter – Other Condensed Matter
Scientific paper
2006-08-13
Physics
Condensed Matter
Other Condensed Matter
4 pages, brief report
Scientific paper
10.1103/PhysRevA.75.015604
We propose a scheme for the measurement of the s-wave scattering length $a$ of an atom or molecule with significant dipole-dipole interaction with an accuracy at the percent level. The frequencies of the collective oscillations of a Bose-Einstein condensate are shifted by the magnetic dipole interaction. The shift is polarization dependent and proportional to the ratio $\epsilon_{dd}$ of dipolar and s-wave coupling constants. Measuring the differences in the frequencies for different polarization we can extract the value of $\epsilon_{dd}$ and thus measure $a$. We calculate the frequency shifts for a large variety of non-axisymmetric harmonic traps in the Thomas-Fermi limit and find optimal trapping geometries to maximize the shifts.
Giovanazzi Stefano
Pfau Tilman
Santos Laércio
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