An Optical Trap for Collisional Studies on Cold Fermionic Potassium
G. Roati, W. Jastrzebski, A. Simoni, G. Modugno, M. Inguscio
Abstract
We report on trapping of fermionic 40K atoms in a red-detuned standing-wave optical trap, loaded from a magneto-optical trap. Typically, 106 atoms are loaded at a density of 1012 cm-3 and a temperature of 65 microK, and trapped for more than 1 s. The optical trap appears to be the proper environment for performing collisional measurements on the cold atomic sample. In particular we measure the elastic collisional rate by detecting the rethermalization following an intentional parametric heating of the atomic sample. We also measure the inelastic two-body collisional rates for unpolarized atoms in the ground hyperfine states, through detection of trap losses.
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