Landau-Zener sweeps and sudden quenches in coupled Bose-Hubbard chains

Details Landau-Zener sweeps and sudden quenches in coupled Bose-Hubbard chains Landau-Zener sweeps and sudden quenches in coupled Bose-Hubbard chains

2011-02-25

arxiv.org/abs/1102.5301v1

Phys. Rev. Lett. 106, 155302 (2011)

Physics

Quantum Physics

6 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.106.155302

We simulate numerically the dynamics of strongly correlated bosons in a two-leg ladder subject to a time-dependent energy bias between the two chains. When all atoms are initially in the leg with higher energy, we find a drastic reduction of the inter-chain particle transfer for slow linear sweeps, in quantitative agreement with recent experiments. This effect is preceded by a rapid broadening of the quasi-momentum distribution of atoms, signaling the presence of a bath of low-energy excitations in the chains. We further investigate the scenario of quantum quenches to fixed values of the energy bias. We find that for large enough density the momentum distribution relaxes to that of an equilibrium thermal state with the same energy.

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