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arXiv · 2501.16318

Shift of the Bose-Einstein condensation temperature due to dipolar interactions

Milan Krstajić·Jiří Kučera·Lucas R. Hofer·Gavin Lamb·Péter Juhász·Robert P. Smith
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Abstract

We report the first measurements of the BEC critical temperature shift due to dipolar interactions, employing samples of ultracold erbium atoms which feature significant (magnetic) dipole-dipole interactions in addition to tuneable 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 opens the door 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.

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Milan Krstajić, Jiří Kučera, Lucas R. Hofer, Gavin Lamb, Péter Juhász, Robert P. Smith. 2025-01-27. Shift of the Bose-Einstein condensation temperature due to dipolar interactions. https://arxiv.org/abs/2501.16318

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