Large atom number dual-species magneto-optical trap for fermionic 6Li and 40K atoms

Abstract

We present the design, implementation and characterization of a dual-species magneto-optical trap (MOT) for fermionic 6 Li and 40 K atoms with large atom numbers. The MOT simultaneously contains 5.2 × 10 9 6 Li-atoms and 8.0 × 10 9 40 K-atoms, which are continuously loaded by a Zeeman slower for 6 Li and a 2D-MOT for 40 K. The atom sources induce capture rates of 1.2 × 10 9 6 Li-atoms/s and 1.4 × 10 9 40 K-atoms/s. Trap losses due to light-induced interspecies collisions of ∼65% were observed and could be minimized to ∼10% by using low magnetic field gradients and low light powers in the repumping light of both atomic species. The described system represents the starting point for the production of a large-atom number quantum degenerate Fermi-Fermi mixture.

Photoassociative production of ultracold heteronuclearYbLi*molecules

“…Indeed, if we fit the data in Figure 1 to the equationṄ Yb = −K ′ 2 n Li (0)N Yb , we find the same value for K ′ 2 as quoted above. The above value for K ′ 2 is an order of magnitude larger than that measured in other brightbright dual-species MOTs [22]. As we will see in Sections III and IV, this has important consequences for our measurements at both Li 2 and YbLi PA resonances.…”

Two-photon photoassociation spectroscopy of CsYb: Ground-state interaction potential and interspecies scattering lengths

“…Mixtures of ultracold atomic gases provide an appealing platform for numerous avenues of research, including the investigation of novel quantum phases [1][2][3][4][5][6][7], the study of Efimov physics [8][9][10][11] and the creation of ultracold polar molecules [12][13][14][15][16][17][18][19][20][21][22]. Early experiments explored bi-alkali-metal gases [23][24][25][26][27][28][29][30][31][32][33], but there is currently a growing interest in mixtures composed of alkali-metal and closed-shell atoms [34][35][36][37][38][39][40][41]. Such mixtures open up the possibility of creating paramagnetic ground-state polar molecules, with applications in quantum simulation and quantum information [42][43][44], precision measurement [45], tests of fundamental physics [46]…”

Interspecies thermalization in an ultracold mixture of Cs and Yb in an optical trap

“…We predict scattering lengths for all isotopic combinations of Cs and Yb. We also demonstrate the independent production of 174 Yb and 133 Cs Bose-Einstein condensates using the same optical dipole trap, an important step towards the realization of a quantum-degenerate mixture of the two species.The realization of ultracold atomic mixtures [1][2][3][4][5][6][7][8][9][10][11][12] has opened up the possibility of exploring new regimes of few-and many-body physics. Such mixtures have been used to study Efimov physics [13][14][15], probe impurities in Bose gases [16], and entropically cool gases confined in an optical lattice [17].…”