All-optical production ofL7iBose-Einstein condensation using Feshbach resonances

Thermodynamics of Ultracold Fermi Gases

“…The scattering length value is also in agreement with the calculation a 77 = 11.5 a 0 in [118]. Extending this measurement to stronger interactions, on Bose gases prepared close to Feshbach resonances (for example using 7 Li clouds in the |1, 1 or |1, 0 states, held in an optical dipole trap [119,120,121]), could reveal more complex beyond-mean-eld phenomena.…”

“…A tri-critical point (η t , ζ t ) would set the separation between a rst-and a second-order transition [49]. [119,120] and |1, 0 [121], and this work could be done with our experimental setup. We also showed the pertinence of our method for ultracold gases in optical lattices.…”

Rapid production of large Li7 Bose-Einstein condensates using D1 gray molasses

“…Still, the gray molasses provides a very favorable condition for evaporation cooling. Without the gray molasses, the initial temperature in the quadrupole trap is ∼ 2 mK, and we cannot achieve the runaway evaporation cooling because of the scattering length drops at a few mK [11].…”

“…The lower hyperfine spin state |F = 1 has a very small scattering length under a residual magnetic field, so that evaporation cooling of laser-cooled atoms hardly works for both spin states in a conventional magnetic trap. As a result, the Bose-Einstein condensates are produced in an optical potential by sympathetic cooling with its fermionic isotope [12,13], or using the Feshbach resonance [11] but with a very small numbers of atom.…”

Association of Efimov Trimers from a Three-Atom Continuum

“…The experiments are performed on a gas of 7 Li atoms polarized on the jF ¼ 1; m F ¼ 0i state and evaporatively cooled down to a typical temperature of $1:5 K in an optical trap [33]. In earlier studies of the a-dependent spectrum of K 3 on this state in the vicinity of a broad Feshbach resonance at $894 G we identified a recombination minimum at a à 0 ¼ 1130ð120Þa 0 and a maximum at a À ¼ À280ð12Þa 0 , where a 0 denotes the Bohr radius [7,31].…”