Superfluidity and Density Order in a Bilayer Extended Hubbard Model

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2015-04
Major/Subject
Mcode
Degree programme
Language
en
Pages
8
1-8
Series
PHYSICAL REVIEW B, Volume 91, issue 14
Abstract
We use cellular dynamical mean-field theory to study the phase diagram of the square lattice bilayer Hubbard model with an interlayer interaction. The layers are populated by two-component fermions, and the densities in both layers and the strength of the interactions are varied. We find that an attractive interlayer interaction can induce a checkerboard density-ordered phase and superfluid phases, with either interlayer or intralayer pairing. Remarkably, the latter phase does not require an intralayer interaction to be present: it can be attributed to an induced attractive interaction caused by density fluctuations in the other layer.
Description
| openaire: EC/FP7/340748/EU//CODE
Keywords
bilayer Hubbard model, cold quantum gases, superfluidity
Other note
Citation
Vanhala , T I , Baarsma , J , Heikkinen , M , Troyer , M , Harju , A & Törmä , P 2015 , ' Superfluidity and Density Order in a Bilayer Extended Hubbard Model ' , Physical Review B , vol. 91 , no. 14 , 144510 , pp. 1-8 . https://doi.org/10.1103/PhysRevB.91.144510