Tuesday, May 7, 2013

1110.0840 (Masudul Haque et al.)

Slow interaction ramps in trapped many-particle systems: universal
deviations from adiabaticity

Masudul Haque, F. E. Zimmer
For harmonic-trapped atomic systems, we report system-independent non-adiabatic features in the response to interaction ramps. We provide results for several different systems in one, two, and three dimensions: bosonic and fermionic Hubbard models realized through optical lattices, a Bose-Einstein condensate, a fermionic superfluid and a fermi liquid. The deviation from adiabaticity is characterized through the heating or excitation energy produced during the ramp. We find that the dependence of the heat on the ramp time is sensitive to the ramp protocol but has aspects common to all systems considered. We explain these common features in terms of universal dynamics of the system size or cloud radius.
View original: http://arxiv.org/abs/1110.0840

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