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arXiv · 1407.5469

Beyond mean-field study of a binary bosonic mixture in a state-dependent honeycomb lattice

Lushuai Cao·Sven Krönke·Jan Stockhofe·Peter Schmelcher·Juliette Simonet·Klaus Sengstock·Dirk-Sören Lühmann
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Abstract

We investigate a binary mixture of bosonic atoms loaded into a state-dependent honeycomb lattice. For this system, the emergence of a so-called twisted-superfluid ground state was experimentally observed in [Soltan-Panahi et al., Nat. Phys. 8, 71 (2012)]. Theoretically, the origin of this effect is not understood. We perform numerical simulations of an extended Bose-Hubbard model adapted to the experimental parameters employing the Multi-Layer Multi-Configuration Time-Dependent Hartree method for Bosons. Our results confirm the overall applicability of mean-field theory within the relevant parameter range. Beyond this, we provide a detailed analysis of correlation effects correcting the mean-field result. These have the potential to induce asymmetries in single shot time-of-flight measurements, but we find no indication of the patterns characteristic of the twisted superfluid. We comment on the restrictions of our model and possible extensions.

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Lushuai Cao, Sven Krönke, Jan Stockhofe, Peter Schmelcher, Juliette Simonet, Klaus Sengstock, Dirk-Sören Lühmann. 2014-07-21. Beyond mean-field study of a binary bosonic mixture in a state-dependent honeycomb lattice. https://doi.org/10.1103/physreva.91.043639

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