Berlin 2014 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 34: Poster: Ultra-cold atoms, ions and BEC (with Q)
A 34.8: Poster
Mittwoch, 19. März 2014, 16:30–18:30, Spree-Palais
phase transition of a bosonic binary mixture in state-dependent hexagonal optical lattices — •Lushuai Cao1,2, Sven Krönke1, Jan Stockhofe1, Peter Schmelcher1,2, Dirk-Sören Lühmann3, and Ole Jürgensen3 — 1Zentrum für Optische Quantentechnologien, Universität Hamburg, Hamburg, Germany — 2The Hamburg Centre for Ultrafast Imaging, Hamburg, Germany — 3Institut für Laser-Physik, Universität Hamburg, Hamburg, Germany
We present numerical investigations on the phase transition of a binary bosonic mixture in the state-dependent hexagonal optical lattices, of which the simulations takes into account many-body effects. It has been experimentally [P. S. Panahi, Nat. Phys. 8, 71 (2012)] shown that a binary bosonic mixture possesses a novel phase of Twisted Superfluid, which is characterized by the symmetry breaking in Time-of-Flight measurements. This phase was initially understood with the mean field approximation, by an interband phase difference, while a more extensive mean-field study [S. Choudhury, Phys. Rev. A 87, 033621 (2013)] indicated that there should be no such interband phase difference in the ground state. This work attempts to understand the novel phase with the more exact simulations, taking into account the many-body effects. The many-body simulations are performed via a numerically exact method ML-MCTDHB [S. Krönke, New J. Phys. 15, 063018 (2013), L. Cao, J. Chem. Phys. 139, 134103 (2013)].