Local versus global equilibration near the bosonic Mott-superfluid transition

Details Local versus global equilibration near the bosonic Mott-superfluid transition Local versus global equilibration near the bosonic Mott-superfluid transition

2010-09-29

arxiv.org/abs/1009.5728v1

Phys. Rev. Lett. 106, 125301 (2011)

Physics

Condensed Matter

Quantum Gases

4 pages, 4 figs. 6 subfigures

Scientific paper

10.1103/PhysRevLett.106.125301

We study the response of trapped two dimensional cold bosons to time dependent lattices. We find that in lattice ramps from 11 (superfluid, $\hbar/U_{\text{i}} = 3$ms, $\hbar/J_{\text{i}} = 45$ms) to 16 recoils (Mott, $\hbar/U_{\text{f}} = 2$ms, $\hbar/J_{\text{f}} = 130$ms) 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.

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