Sub-Doppler laser cooling of fermionic 40 K atoms

  title={Sub-Doppler laser cooling of fermionic 40 K atoms},
  author={Giovanni Modugno and Craig Benko and Peter Hannaford and G. Roati and M. Inguscio},
  journal={Physical Review A},
We report laser cooling of fermionic ${}^{40}\mathrm{K}$ atoms, with temperatures down to $(15\ifmmode\pm\else\textpm\fi{}5) \ensuremath{\mu}\mathrm{K},$ for an enriched sample trapped in a magneto-optical trap and additionaly cooled in optical molasses. This temperature is a factor of 10 below the Doppler-cooling limit and corresponds to an rms velocity within a factor of 2 of the lowest realizable rms velocity $(\ensuremath{\sim}{3.5v}_{\mathrm{rec}})$ in three-dimensional optical molasses… 

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