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A: Fachverband Atomphysik

A 1: Ultra-cold atoms, ions and BEC I (with Q)

A 1.4: Vortrag

Montag, 17. März 2014, 11:15–11:30, BEBEL E34

All-optical cooling scheme for a quantum degenerate ⁶Li-¹³³Cs mixture — •Alda Arias, Rico Pires, Juris Ulmanis, Stephan Häfner, Carmen Renner, Marc Repp, Eva Kuhnle, and Matthias Weidemüller — Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg

We have recently measured Feshbach resonances (FRs) in an ultracold ⁶Li-¹³³Cs mixture with a phase-space density of a factor of  100 below quantum degeneracy [1]. In this talk we will present an all-optical scheme to bring both gases together to quantum degeneracy. After ⁶Li is loaded and evaporated in a tightly focused crossed-dipole trap (CDT), ¹³³Cs will be loaded into a spatially separated large volume reservoir trap. Subsequently, both traps are spatially overlapped and the CDT serves as a dimple trap [2] for Cs. The difference in trapping potentials, that both species experience due to their different polarizabilities, is compensated by a tune out wavelength trap. With a frequency between the D₁ and D₂ lines of Cs, it only confines the ⁶Li atoms, while exerting no additional force on Cs. This independent control of the trapping potential of both species, together with the tunability of the interspecies scattering length by means of FRs will allow us to evaporate to double quantum degeneracy, which is an excellent starting point for future experiments on few- and many-body physics.

[1] M. Repp et al., Phys. Rev. A 87, 010701(R) (2013)

[2] T. Weber et al., Science 299, 232 (2003).