We propose to detect quadrupole interactions of neutral ultracold atoms via their induced mean-field shift. We consider a Mott insulator state of spin-polarized atoms in a two-dimensional optical square lattice. The quadrupole moments of the atoms are aligned by an external magnetic field. As the alignment angle is varied, the mean-field shift shows a characteristic angular dependence, which constitutes the defining signature of the quadrupole interaction. For the 3P2 states of Yb and Sr atoms, we find a frequency shift of the order of tens of Hertz, which can be realistically detected in experiment with current technology. We compare our results to the mean-field shift of a spin-polarized quasi-two-dimensional Fermi gas in continuum. © 2014 American Physical Society.
CITATION STYLE
Lahrz, M., Lemeshko, M., Sengstock, K., Becker, C., & Mathey, L. (2014). Detecting quadrupole interactions in ultracold Fermi gases. Physical Review A - Atomic, Molecular, and Optical Physics, 89(4). https://doi.org/10.1103/PhysRevA.89.043616
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