Dipolar-induced resonance for ultracold bosons in a quasi-one-dimensional optical lattice

Year: 2013

Authors: Bartolo N., Papoular D.J., Barbiero L., Menotti C., Recati A.

Autors Affiliation: INO-CNR BEC Center and Dipartimento di Fisica, Università di Trento, 38123 Povo, Italy; Laboratoire Charles Coulomb, CNRS, Université Montpellier 2, Montpellier, France; Dipartimento di Fisica e Astronomia “Galileo Galilei”, Universita di Padova, Padova, Italy; Laboratoire de Physique Théorique, CNRS, Université de Toulouse, Toulouse, France

Abstract: We study the role of the dipolar-induced resonance (DIR) in a quasi-one-dimensional system of ultracold bosons. We first describe the effect of the DIR on two particles in a harmonic trap. Then, we consider a deep optical lattice loaded with ultracold dipolar bosons. In order to describe this system, we introduce a novel atom-dimer extended Bose-Hubbard model, which is the minimal model correctly accounting for the DIR. We analyze the impact of the DIR on the phase diagram at T = 0 by exact diagonalization of a small-sized system. We show that the DIR strongly affects this phase diagram. In particular, we predict the mass density wave to occur in a narrow domain corresponding to weak nearest-neighbor interactions, and we predict the occurrence of a collapse phase for stronger dipolar interactions.


Volume: 88 (2)      Pages from: 023603  to: 023603

More Information: We acknowledge stimulating discussions with M. Baranov, G. Ferrari, L. P. Pitaevskii, G. V. Shlyapnikov, S. Stringari, and W. Zwerger. L. B. acknowledges the hospitality of the BEC Center, Trento, during the initial stage of the project. This work has been supported by ERC through a QGBE grant and by Provincia Autonoma di Trento.
DOI: 10.1103/PhysRevA.88.023603

Citations: 24
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