Spin Gradient Demagnetization Cooling of Ultracold Atoms

Author(s)
Medley, Patrick M.; Weld, David M.; Miyake, Hirokazu; Pritchard, David E.; Ketterle, Wolfgang
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Abstract
We demonstrate a new cooling method in which a time-varying magnetic field gradient is applied to an ultracold spin mixture. This enables preparation of isolated spin distributions at positive and negative effective spin temperatures of ±50   pK. The spin system can also be used to cool other degrees of freedom, and we have used this coupling to cool an apparently equilibrated Mott insulator of rubidium atoms to 350 pK. These are the lowest temperatures ever measured in any system. The entropy of the spin mixture is in the regime where magnetic ordering is expected.
Date issued
2011-05
URI
http://hdl.handle.net/1721.1/67077
Department
Massachusetts Institute of Technology. Department of Physics; MIT-Harvard Center for Ultracold Atoms
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Medley, Patrick et al. “Spin Gradient Demagnetization Cooling of Ultracold Atoms.” Physical Review Letters 106 (2011): n. pag. Web. 18 Nov. 2011. © 2011 American Physical Society
Version: Final published version
ISSN
0031-9007
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