Abstract
We report our experimental results on the collisional physics between non-S-state atoms (ytterbium (Yb), effectively a two-electron system, in the metastable 3P2 state) and S-state atoms (lithium (Li), an alkali metal, in the ground state). At low magnetic fields, by measuring inelastic interspecies collisional losses in the double quantum degenerate mixture we reveal the strong dependence of the inelastic losses on the internal spin states of both species and suppressed losses in stretched state configurations. Increasing the magnetic field up to 800 G we further investigate the magnetic field dependence of the collisional interactions. There, smoothly increasing inelastic losses are observed towards higher fields. The combined knowledge of both the magnetic field and the spin state dependence of the collisional losses of this prototypical mixture system of non-S-state and S-state atoms provides a significant step forward towards controllable impurity physics realized in the Yb-Li ultracold system.
Highlights
The understanding and control of the collisional properties of single-species ultracold atomic systems was and is instrumental to their application in the research of fundamental phenomena, quantum simulation and quantum computation
1/2, F = 1/2, mF = +1/2) ground state atoms, where we show the intensity of the obtained fluorescence signal as a function of the holding time
Fig. 1) that transfers the remaining 174 Yb(3 P2 ) atoms back to the ground state. There they are recaptured by a magnetooptical trap (MOT) operating on the 399-nm transition whose fluorescence light is integrated for 1 s on a sensitive charge-coupled device (CCD) camera to obtain a high-contrast signal of the MOT
Summary
The understanding and control of the collisional properties of single-species ultracold atomic systems was and is instrumental to their application in the research of fundamental phenomena, quantum simulation and quantum computation. At low magnetic bias fields we investigate inelastic interspecies collisional losses in the double quantum degenerate mixture that reveal the dependence of the inelastic losses on the internal spin states of both species. Those experiments reveal a smooth but steady increase of the inelastic collision rates up to the highest investigated magnetic fields of 800 G and underline the importance of choosing collisional channels with suppressed inelastic dynamics
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