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Spin gradient thermometry for ultracold atoms in optical lattices | | David M. Weld
; Patrick Medley
; Hirokazu Miyake
; David Hucul
; David E. Pritchard
; Wolfgang Ketterle
; | | Date: |
21 Aug 2009 | | Abstract: | We demonstrate spin gradient thermometry, a new general method of measuring
the temperature of ultracold atoms in optical lattices. We realize a mixture of
spins separated by a magnetic field gradient. Measurement of the width of the
transition layer between the two spin domains serves as a new method of
thermometry which is observed to work over a broad range of lattice depths and
temperatures, including in the Mott insulator regime. We demonstrate the
thermometry in a system of ultracold rubidium atoms. The lowest measured
temperature is 1 nK, indicating that the system has reached the quantum regime,
where insulating shells are separated by superfluid layers. | | Source: | arXiv, 0908.3046 | | Services: | Forum | Review | PDF | Favorites | |
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