Sympathetic cooling route to Bose-Einstein condensate and Fermi-liquid mixtures

Côté, Robin; Onofrio, Roberto; Timmermans, Eddy

doi:10.1103/physreva.72.041605

Cited by 9 publications

(9 citation statements)

References 28 publications

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“…This is particularly important for cooling pure Fermi gases, which cannot be cooled actively. While the 6 Li-87 Rb combination appears to be particularly well suited for reaching low temperatures [13,14], the smallness of the interspecies s-wave scattering length slows down the sympathetic cooling rate [10]. This could be a problem if heating processes such as Fermi hole heating become important [14,15].…”

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confidence: 99%

Feshbach resonances in mixtures of ultracoldLi6andRb87gases

et al. 2008

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We report on the observation of two Feshbach resonances in collisions between ultracold 6 Li and 87 Rb atoms in their respective hyperfine ground states |F, mF = |1/2, 1/2 and |1, 1 . The resonances show up as trap losses for the 6 Li cloud induced by inelastic Li-Rb-Rb three-body collisions. The magnetic field values where they occur represent important benchmarks for an accurate determination of the interspecies interaction potentials. A broad Feshbach resonance located at 1066.92 G opens interesting prospects for the creation of ultracold heteronuclear molecules. We furthermore observe a strong enhancement of the narrow p-wave Feshbach resonance in collisions of 6 Li atoms at 158.55 G in the presence of a dense 87 Rb cloud. The effect of the 87 Rb cloud is to introduce Li-Li-Rb three-body collisions occurring at a higher rate than Li-Li-Li collisions.

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confidence: 99%

Feshbach resonances in mixtures of ultracoldLi6andRb87gases

et al. 2008

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“…We inves-tigated the mass dependence of our results, which were compared to the data published by Weiss et al [10]. It has been suggested by Côté et al [11] that our calculations were tentative because the potentials need to be specified more precisely. The new potentials for NaRb of Pashov et al [12] represent an improvement over those that were available at the time of our calculations [9] but, contrary to their suggestion [12], the confusion of units in the work of Weiss et al [10] does not compromise the reliability of our earlier calculations since we did not use but merely quoted their results, which were corrected later [13].…”

Section: Introductionmentioning

confidence: 91%

“…Note that in the limit k → 0, Levinson's theorem is recovered from Eqs. (10) and (11). Now, inserting Eqs.…”

Section: Spin Change Cross Sectionmentioning

confidence: 99%

s-wave and p-wave scattering in a cold gas of Na and Rb atoms

Ouerdane

Jamieson

2009

Eur. Phys. J. D

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*Using improved experimentally based X 1 Σ + and a 3 Σ + molecular potentials of NaRb, we apply the variable phase method to compute new data for low energy scattering of 23 Na atoms by 85 Rb atoms and 87 Rb atoms. These are the scattering lengths and volumes, numbers of bound states and effective ranges, which we use to obtain the low energy spin-change cross section as functions of the system temperature and the isotope masses. From an analysis of the contributions of s-wave and p-wave scatterings to the elastic cross section we estimate temperatures below which only s-wave scattering is dominant. We compare our quantal results to data obtained from the semiclassical approximation. We supply evidence for the existence of a near zero energy p-wave bound state supported by the singlet molecular potential.

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“…An example where this plays a role is a mixture of the high-field seeking states 6 Li | and 87 Rb |2, 2 [18]. For this case, sympathetic cooling of Li via Rb to very low temperatures (such as those needed for reaching the critical temperature for BCSpairing) requires a sensitive matching of the respective gas densities: This guarantees that the Li Fermi temperature is lower than the critical temperature for Bose-Einstein condensation of Rb [19] and reduces fermion-hole heating as far as possible [20]. This respective density-matching is now possible by controlling the potentials' shape via microwave or radio frequencies.…”

Section: Potential Shapingmentioning

confidence: 99%

Highly versatile atomic micro traps generated by multifrequency magnetic field modulation

Courteille¹,

Deh²,

Fortágh³

et al. 2006

J. Phys. B: At. Mol. Opt. Phys.

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Abstract. We propose the realization of custom-designed adiabatic potentials for cold atoms based on multimode radio frequency radiation in combination with static inhomogeneous magnetic fields. For example, the use of radio frequency combs gives rise to periodic potentials acting as gratings for cold atoms. In strong magnetic field gradients the lattice constant can be well below 1 µm. By changing the frequencies of the comb in time the gratings can easily be propagated in space, which may prove useful for Bragg scattering atomic matter waves. Furthermore, almost arbitrarily shaped potential are possible such as disordered potentials on a scale of several 100 nm or lattices with a spatially varying lattice constant. The potentials can be made state selective and, in the case of atomic mixtures, also species selective. This opens new perspectives for generating tailored quantum systems based on ultra cold single atoms or degenerate atomic and molecular quantum gases.

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Sympathetic cooling route to Bose-Einstein condensate and Fermi-liquid mixtures

Cited by 9 publications

References 28 publications

Feshbach resonances in mixtures of ultracoldLi6andRb87gases

Feshbach resonances in mixtures of ultracoldLi6andRb87gases

s-wave and p-wave scattering in a cold gas of Na and Rb atoms

Highly versatile atomic micro traps generated by multifrequency magnetic field modulation

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