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Bulletin of the American Physical Society

Critical temperature of a tunable trapped Bose gas

Robert P. Smith, Naaman Tammuz, Robert L. Campbell, Scott Beattie, Stuart Moulder, Zoran Hadzibabic

Published Jun 14, 2011• 0 citations
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We report measurements of the Bose-Einstein condensate critical temperature shift due to dipolar interactions, employing samples of ultracold erbium atoms which feature significant (magnetic) dipole-dipole interactions in addition to tunable contact interactions. Using a highly prolate harmonic trapping potential, we observe a clear dependence of the critical temperature on the orientation of the dipoles relative to the trap axis. Our results are in good agreement with mean-field theory for a range of contact interaction strengths. This work creates an opportunity for further investigations into beyond-mean-field effects and the finite-temperature phase diagram in the more strongly dipolar regime where supersolid and droplet states emerge.