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5 papers · 2 filters
Breakdown of a topological phase: Quantum phase transition in a loop gas model with tension
Simon Trebst, Philipp Werner, Matthias Troyer +2
We study the stability of topological order against local perturbations by considering the effect of a magnetic field on a spin model -- the toric code -- which is in a topological…
Time interval distributions of atoms in atomic beams
Michael Köhl, Anton Öttl, Stephan Ritter +3
We report on the experimental investigation of two-particle correlations between neutral atoms in a Hanbury Brown and Twiss experiment. Both an atom laser beam and a pseudo-thermal…
Observing the Formation of Long-range Order during Bose-Einstein Condensation
Stephan Ritter, Anton Öttl, Tobias Donner +3
We have experimentally investigated the formation of off-diagonal long-range order in a gas of ultracold atoms. A magnetically trapped atomic cloud prepared in a highly nonequilibr…
Ensemble Optimization Techniques for the Simulation of Slowly Equilibrating Systems
S. Trebst, D. A. Huse, E. Gull +3
Competing phases or interactions in complex many-particle systems can result in free energy barriers that strongly suppress thermal equilibration. Here we discuss how extended ense…
Critical Temperature and Thermodynamics of Attractive Fermions at Unitarity
Evgeni Burovski, Nikolay Prokof'ev, Boris Svistunov +1
The unitarity regime of the BCS-BEC crossover can be realized by diluting a system of two-component lattice fermions with an on-site attractive interaction. We perform a systematic…