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Efficient demagnetization cooling of atoms and its limits




Demagnetization cooling relies on spin-orbit coupling that brings motional and spin degrees of freedom into thermal equilibrium. In the case of a gas, one has the advantage that the spin degree of freedom can be cooled very efficiently using optical pumping. We investigate demagnetization cooling of a chromium gas in a deep optical dipole trap over a large temperature range and reach high densities up to 5×10^19 m^−3. We study the loss mechanism under such extreme conditions and identify excited-state collisions as the main limiting process. We discuss that in some systems demagnetization cooling has a realistic potential of reaching degeneracy by optical cooling only.

Author(s): Valentin Volchkov and Jahn Rührig and Tilman Pfau and Axel Griesmaier
Journal: Physical Review A
Volume: 89
Pages: 043417
Year: 2014
Month: April
Day: 17
Publisher: American Physical Society (APS)

Department(s): Optics & Sensing Laboratory
Bibtex Type: Article (article)
Paper Type: Journal

DOI: 10.1103/PhysRevA.89.043417
State: Published


  title = {Efficient demagnetization cooling of atoms and its limits},
  author = {Volchkov, Valentin and R{\"u}hrig, Jahn and Pfau, Tilman and Griesmaier, Axel},
  journal = {Physical Review A},
  volume = {89},
  pages = {043417},
  publisher = {American Physical Society (APS)},
  month = apr,
  year = {2014},
  month_numeric = {4}