Detecting quadrupole interactions in ultracold Fermi gases Journal Article

Author(s): Lahrz, Martin; Lemeshko, Mikhail P; Sengstock, Klaus; Becker, Christoph; Mathey, Ludwig
Article Title: Detecting quadrupole interactions in ultracold Fermi gases
Abstract: 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.
Keywords: Angular dependence; Current technology; External magnetic field; Mean-field shifts; Mott insulator state; Quadrupole interactions; Quadrupole moments; Spin-polarized atoms
Journal Title: Physical Review A - Atomic, Molecular, and Optical Physics
Volume: 89
Issue 4
ISSN: 1094-1622
Publisher: American Physical Society  
Date Published: 2014-04-23
Start Page: Article number: 043616
DOI: 10.1103/PhysRevA.89.043616
Open access: yes (repository)
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