Dresden 2011 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 37: MLT: Quantum Liquids, Bose-Einstein Condensates, Ultra-cold Atoms, ...

TT 37.10: Talk

Wednesday, March 16, 2011, 16:30–16:45, HSZ 105

Dipolar bosons in coupled one-dimensional tubes — •Marianne Bauer and Meera Parish — Cavendish Laboratory, JJ Thompson Avenue, Cambridge, CB3 0HE, United Kingdom

Dipolar bosons in one-dimensional optical lattices are known to exhibit interesting phenomena. The phase diagram of such a system forms a complete devil’s staircase in the classical limit of zero intersite hopping [1]. Including hopping leads to a competition of the crystalline Mott phases with a superfluid of defects [2]. However, a central question is how this behaviour survives as we perturb away from one dimension. Here, we provide an important step in this direction by considering the case of two coupled one-dimensional tubes. We find that the coupling between tubes can affect the types of defects appearing within the Mott phases, thus changing the region in chemical potential over which each filling fraction is stable. We also investigate how the Mott lobes vary with respect to intertube distance. Finally, we discuss the implications of our results for cold-atom experiments.
P. Bak and P. Bruinsma, Phys. Rev. Lett. 49, 249 (1982)
F. J. Burnell, M. M. Parish, N. R. Cooper and S. L. Sondhi, Phys. Rev. B, 80, 174519 (2009)