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Thermometry and Refrigeration in a Two-Component Mott Insulator of Ultracold Atoms | | David M. Weld
; Patrick Medley
; Hirokazu Miyake
; David E. Pritchard
; Wolfgang Ketterle
; | | Date: |
27 Aug 2010 | | Abstract: | The two-component Mott insulator (2CMI) is a fundamental ingredient for
experiments seeking to study spin physics using ultracold atoms in optical
lattices. Recent experimental work has demonstrated that the 2CMI can be used
for thermometry, and that its excitation spectrum enables a new cooling
technique based on adiabatic reduction of an applied magnetic field gradient.
Comparison to theory is needed. We present results of calculations based on a
model of the kinetic and spin degrees of freedom of a two-component Mott
insulator in an inhomogeneous trapping potential at various temperatures and
magnetic field gradients. We discuss higher-order corrections to spin gradient
thermometry, and show that adiabatic reduction of the field gradient is capable
of cooling below the Curie or N’eel temperature of the spin ordered phases. | | Source: | arXiv, 1008.4610 | | Services: | Forum | Review | PDF | Favorites | |
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