Combining Ytterbium and Lithium: Molecules and Quantum Degenerate Mixtures

Speaker: 
Subhadeep Gupta
Event Date and Time: 
Thu, 2016-03-31 16:00 - 17:00
Location: 
Chem D-215
Local Contact: 
Kirk Madison
Intended Audience: 
Graduate

I will present our recent experimental work on ultracold mixtures of ytterbium and lithium atoms. Employing ytterbium in an excited metastable (3P2) state, we have measured magnetic field dependent interactions with lithium ground state atoms co-confined in an optical trap. Our observations provide first evidence for Feshbach resonances in a mixture of alkali and alkaline-earth-like atoms [1, 2]. Using a dual-species magneto-optical trap we have formed YbLi* molecules through photoassociation resonances, providing a first step for coherent production of ultracold doublet-sigma molecules. I will also report on a readily adaptable method for rapid quantum degenerate gas production. By dynamically shaping the confinement during evaporative cooling in a “painted” optical potential, we have demonstrated Yb BEC production times as low as 1.6 seconds [3]. Extending these cooling techniques to the Yb-Li system, we create a two-species mixture of Bose and Fermi superfluids.

 

[1] A. Khramov et al, Ultracold heteronuclear mixture of ground and excited state atoms, Phys. Rev. Lett. 112, 033201 (2014).

[2] W. Dowd et. al., Magnetic field dependent interactions in an ultracold Li-Yb(3P2) mixture, New J. Phys. 17, 055007 (2015).

[3] R. Roy, et. al, Rapid cooling to quantum degeneracy in dynamically shaped atom traps, arXiv:1601.05103 (2016).

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