Direct evaporative cooling of 39K atoms to Bose-Einstein condensation

Abstract

We report the realization of Bose-Einstein condensates of 39K atoms without the aid of an additional atomic coolant. Our route to Bose-Einstein condensation comprises Sub Doppler laser cooling of large atomic clouds with more than 10^10 atoms and evaporative cooling in optical dipole traps where the collisional cross section can be increased using magnetic Feshbach resonances. Large condensates with almost 10^6 atoms can be produced in less than 15 seconds. Our achievements eliminate the need for sympathetic cooling with Rb atoms which was the usual route implemented till date due to the unfavourable collisional property of 39K. Our findings simplify the experimental set-up for producing Bose-Einstein condensates of 39K atoms with tunable interactions, which have a wide variety of promising applications including atom-interferometry to studies on the interplay of disorder and interactions in quantum gases.

7 pages, 6 figures

References in corpus (12)

• Formation of bright matter-wave solitons during the collapse of Bose-Einstein condensates
• Control of Interaction-Induced Dephasing of Bloch Oscillations
• Pinning quantum phase transition for a Luttinger liquid of strongly interacting bosons
• 39-K Bose-Einstein condensate with tunable interactions
• Atom interferometry with a weakly-interacting Bose Einstein condensate
• Feshbach resonances in ultracold K(39)
• Phase Coherence and Superfluid-Insulator Transition in a Disordered Bose-Einstein Condensate
• Magnetic dipolar interaction in an atomic Bose Einstein condensate interferometer
• Effects of Interactions on the Critical Temperature of a Trapped Bose Gas
• Optimized production of large Bose Einstein Condensates
• Efficient Production of Large 39K Bose-Einstein Condensates
• Direct evaporative cooling of 41K into a Bose-Einstein condensate

Cited by in corpus (23)

• Measurement of the mobility edge for 3D Anderson localization
• Universality of the three-body Efimov parameter at narrow Feshbach resonances
• Tunable dual-species Bose-Einstein condensates of ${}^{39}$K and ${}^{87}$Rb
• Gray molasses cooling of ${}^{39}$K to a high phase-space density
• Production of a degenerate Fermi-Fermi mixture of dysprosium and potassium atoms
• Observation of interspecies Feshbach resonances in an ultracold ${}^{39}$K-${}^{133}$Cs mixture and refinement of interaction potentials
• All optical cooling of ${}^{39}$K to Bose Einstein condensation
• Observation of Weak Collapse in a Bose-Einstein Condensate
• Analog cosmological reheating in an ultracold Bose gas
• Spatial Bloch oscillations of a quantum gas in a "beat-note" superlattice
• Feshbach resonances, molecular bound states and prospects of ultracold molecule formation in mixtures of ultracold K and Cs
• Feshbach resonances and weakly bound molecular states of boson-boson and boson-fermion NaK pairs
• Degenerate Raman sideband cooling of 39K
• Realization of BEC-BCS crossover physics in a compact oven-loaded magneto-optic trap apparatus
• A high-flux source system for matter-wave interferometry exploiting tunable interactions
• Rapid generation of all-optical ${}^{39}$K Bose-Einstein condensates using a low-field Feshbach resonance
• Matter-wave collimation to picokelvin energies with scattering length and potential shape control
• Rapid generation and number-resolved detection of spinor Rubidium Bose-Einstein condensates
• Observation of the algebraic localization-delocalization transition in a 1D disordered potential with a bias force
• Effect of AC-Stark shift in optical dipole trap on absorption imaging of trapped atoms
• Formation of ultracold ${}^{39}$K${}^{133}$Cs Feshbach molecules
• Two-mode Phonon Squeezing in Bose-Einstein Condensates for Gravitational Wave Detection
• Accelerated Thermalisation of 39K atoms in a Magnetic Trap with Superimposed Optical Potential