Volume 109, Number 2, January 2015
|Number of page(s)||6|
|Section||Atomic, Molecular and Optical Physics|
|Published online||23 January 2015|
Infinite density for cold atoms in shallow optical lattices
1 Institut für Experimentalphysik, Universität Innsbruck - A-6020 Innsbruck, Austria
2 Dahlem Center for Complex Quantum Systems, FU Berlin - D-14195 Berlin, Germany
3 Department of Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg - D-91058 Erlangen, Germany
Received: 12 May 2014
Accepted: 24 December 2014
Infinite densities are non-normalizable quasi-probability distributions that can describe the long-time properties of systems when ergodicity is broken and the equilibrium Boltzmann-Gibbs distribution fails. Their experimental observation has remained elusive so far. We here perform semiclassical Monte Carlo simulations of cold atoms in dissipative optical lattices with realistic parameters. We show that the momentum infinite density, as well as its scale invariance, should be observable in shallow potentials. We further evaluate the momentum autocorrelation function both in the stationary and nonstationary, aging regime.
PACS: 37.10.Jk – Atoms in optical lattices / 05.40.-a – Fluctuation phenomena, random processes, noise, and Brownian motion / 05.40.Fb – Random walks and Levy flights
© EPLA, 2015
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