Degenerate Raman sideband cooling of 40K atoms

Abstract

We report on the implementation of degenerate Raman sideband cooling of ${}^{40}$K atoms. The scheme incorporates a 3D optical lattice, which confines the atoms and drives the Raman transitions. The optical cooling cycle is closed by two optical pumping beams. The wavelength of the laser beams forming the lattice is close to the D${}_2$ atomic transition, while the optical pumping is operated near the D${}_1$ transition. With this cooling method, we achieve temperature of $\sim$$1\mu$K of a cloud with $\sim$$10^7$ atoms. This corresponds to a phase space density of $\ge$$10^{-3}$. Moreover, the fermionic ensemble is spin polarized to conditions which are favorable for subsequent evaporative cooling. We study the dependence of the cooling scheme on several parameters, including the applied magnetic field, the detuning, duration, and intensity profile of the optical pumping beams. Adding this optical cooling stage to current Fermi gas experiments can improve the final conditions and increase the data rate.

7 pages, 7 figures

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• Many-Body Physics with Ultracold Gases
• Atom Interferometers
• Many-Body Physics with Individually-Controlled Rydberg Atoms
• A Quantum Gas Microscope for Fermionic Atoms
• Creation of a Bose-condensed gas of rubidium 87 by laser cooling
• Direct laser cooling to Bose-Einstein condensation in a dipole trap
• Absence of heating in a uniform Fermi gas created by periodic driving
• Degenerate Raman sideband cooling of 39K

Cited by in corpus (4)

• Anomalous statistics of laser-cooled atoms in dissipative optical lattices
• Accelerating Relaxation Dynamics in Open Quantum System with Liouvillian Skin Effect
• Non-Markovian skin effect
• Spatial adiabatic passage of ultracold atoms in optical tweezers