Magnetization and spinflip dynamics of atoms in optical lattices
Abstract
We show, experimentally and using quantum Monte Carlo simulations, that the quasithermal paramagnetic behavior of cesium atoms in a onedimensional lin⊥lin optical lattice is characterized by a spin temperature of twice the zerofield kinetic temperature. The magnetization is maximum and almost perfect when the Zeeman shift of the extreme magnetic sublevels approximately equals half the maximum light shift. The lifetime of magnetization and the lasercooling time constant are found to be clearly distinct, the magnetization decay time amounting to at least three times the cooling time. Using simulations we find that the magneticdipole correlation time is approximately proportional to the angular momentum F of the atoms, while cooling and energy correlation time constants are approximately independent of F. Our results imply that for large F laser cooling within single lightshift potential wells (local cooling) occurs.
 Publication:

Physical Review A
 Pub Date:
 October 1998
 DOI:
 10.1103/PhysRevA.58.R2660
 Bibcode:
 1998PhRvA..58.2660R
 Keywords:

 32.80.Lg;
 32.80.Pj;
 42.50.Vk;
 Mechanical effects of light on atoms molecules and ions;
 Optical cooling of atoms;
 trapping;
 Mechanical effects of light on atoms molecules electrons and ions