Rapid production of large 7Li Bose-Einstein condensates using D1 gray molasses
Abstract
We demonstrate the production of large 7Li Bose-Einstein condensates in an optical dipole trap using D1 gray molasses. The sub-Doppler cooling technique reduces the temperature of 4 ×109 atoms to 25 μ 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 , mF=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 ×106 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.
- Publication:
-
Physical Review A
- Pub Date:
- May 2019
- DOI:
- 10.1103/PhysRevA.99.053604
- arXiv:
- arXiv:1905.03555
- Bibcode:
- 2019PhRvA..99e3604K
- Keywords:
-
- Condensed Matter - Quantum Gases;
- Physics - Atomic Physics;
- Quantum Physics
- E-Print:
- Phys. Rev. A 99, 053604 (2019)