Characterizing the temperature dependence of Fano-Feshbach resonances of Ultracold Polarized Thulium

Abstract

Recent studies demonstrated anomalous temperature shifts for some Fano-Feshbach resonances of thulium atoms. These anomalies were explained by the variation in light intensity in the optical dipole trap, which accompanied changes in temperature. In addition, a temperature-related transformation of the statistics of the interresonance spacing was demonstrated [1]. Here, we analyze the shifts of isolated s- and d-type Fano-Feshbach resonances of ultracold thulium atoms with temperature for a fixed depth of an optical dipole trap. The measurements are consistent with the 3-body recombination-based theory of the temperature-related resonance shift and enable the extraction of the resonance parameters, particularly the magnetic moments of closed channel states. This parameter and the known polarizability of the open channel enable us to separate the contributions of the temperature and Stark shift to the overall shift of the resonances and show the dominant role of the Stark effect in the overall shift.

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• Characterisation of three-body loss in ${}^{166}$Er and optimised production of large Bose-Einstein condensates
• Losses of thulium atoms from optical dipole traps operating at 532 and 1064 nm
• Deep Laser Cooling of Thulium Atoms to Sub-$\mu$K Temperatures in Magneto-Optical Trap
• Loss features in ultracold ${}^{162}$Dy gases: two- versus three-body processes
• Bose-Einstein condensate as a diagnostic tool for an optical lattice formed by 1064 nm laser light
• Inspiration from machine learning on example of optimization of the Bose-Einstein condensate of thulium atoms in a 1064-nm trap
• Transport of magnetically sensitive atoms in a magnetic environment
• Factor of 1000 suppression of the depolarization rate in ultracold thulium collisions