Spin gradient demagnetization cooling of ultracold atoms.

Medley, Patrick; Weld, David M; Miyake, Hirokazu; Pritchard, David E; Ketterle, Wolfgang

Medley, Patrick; Weld, David M; Miyake, Hirokazu; Pritchard, David E; Ketterle, Wolfgang.

Afiliación

Medley P; MIT-Harvard Center for Ultracold Atoms, Research Laboratory of Electronics, and Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.

Phys Rev Lett ; 106(19): 195301, 2011 May 13.

Article en En | MEDLINE | ID: mdl-21668171

RESUMEN

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 ââpK. 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.

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Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Phys Rev Lett Año: 2011 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Estados Unidos

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