Rapid production of large ${}^7$Li Bose-Einstein condensates using $D_1$ gray molasses

Abstract

We demonstrate the production of large ${}^7$Li Bose-Einstein condensates in an optical dipole trap using $D_1$ gray molasses. The sub-Doppler cooling technique reduces the temperature of $4\times 10^9$ atoms to $25\mu$K in 3~ms. After microwave evaporation cooling in a magnetic quadrupole trap, we transfer the atoms to a crossed optical dipole trap, where we employ a magnetic Feshbach resonance on the $|F=1,m_F=1⟩$ state. Fast evaporation cooling is achieved by tilting the optical potential using a magnetic field gradient on the top of the Feshbach field. Our setup produces pure condensates with $2.7\times 10^6$ atoms in the optical potential for every 11~s. The trap tilt evaporation allows rapid thermal quench, and spontaneous vortices are observed in the condensates as a result of the Kibble-Zurek mechanism.

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• Spontaneous Formation of Star-Shaped Surface Patterns in a Driven Bose-Einstein Condensate
• Observation of a strongly ferromagnetic spinor Bose-Einstein condensate
• Site-Resolved Imaging of Bosonic Mott Insulator of ${}^7$Li atoms
• $\Lambda$-enhanced gray molasses in a tetrahedral laser beam geometry
• Fast and High-Yield Loading of a D${}_2$ MOT of Potassium from a Cryogenic Buffer Gas Beam
• Bidirectional, Analog Current Source Benchmarked with Gray Molasses-Assisted Stray Magnetic Field Compensation