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Local Versus Global Equilibration near the Bosonic Mott-Insulator–Superfluid Transition
2011
Physical Review Letters
We study the response of trapped two dimensional cold bosons to time dependent lattices. We find that in lattice ramps from 11 (superfluid, ħ/U_i = 3ms, ħ/J_i = 45ms) to 16 recoils (Mott, ħ/U_f = 2ms, ħ/J_f = 130ms) the local number fluctuations remains at their equilibrium values if ramps are slower than 3 ms. Global transport, however, is much slower (1s), especially in the presence of Mott shells. This separation of timescales has practical implications for cold atom experiments and cooling protocols.
doi:10.1103/physrevlett.106.125301
pmid:21517320
fatcat:zdajub7owvhl7emxspkrsbigs4