Regensburg 2016 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 7: Cold Atomic Gases
TT 7.2: Vortrag
Montag, 7. März 2016, 10:30–10:45, H18
Interacting bosons on a two-leg ladder in the presence of gauge fields — Marie Piraud1, Sebastian Greschner2, •Fabian Heidrich-Meisner1, Ian McCulloch3, Temo Vekua2, and Ulrich Schollwoeck1 — 1LMU Munich, Germany — 2University of Hanover, Germany — 3University of Queensland, Australia
We present the phase diagram of the Bose-Hubbard model on a two-leg ladder geometry in the presence of a homogeneous flux per plaquette,
motivated by recent quantum gas experiments [1,2]
that studied the regime of weak interactions. Based on extensive density matrix renormalization group simulations and a bosonization analysis, we
explore the parameter space and calculate experimentally accessible observables.
For hardcore bosons, the phase diagram comprises Meissner and vortex phases atop either superfluids or Mott insulators, depending on filling [4].
For moderate interactions, vortex lattices form at certain commensurate vortex densities. Very interestingly, the breaking of lattice translations in the vortex lattice phases can lead to a spontaneous reversal of the circulation direction of the chiral current [5].
M. Atala et al., Nature Phys. 10, 588 (2014)
M. Mancini et al., Science 349, 1510 (2015)
B. K. Stuhl et al. Science 349, 1514 (2015)
M. Piraud et al., PRB 91, 140406(R) (2015)
S. Greschner et al., PRL 115, 190402 (2015)