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

N. Bartolo, D. J. Papoular, L. Barbiero, C. Menotti, and A. Recati
Phys. Rev. A 88, 023603 – Published 6 August 2013

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.

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  • Received 18 March 2013

DOI:https://doi.org/10.1103/PhysRevA.88.023603

©2013 American Physical Society

Authors & Affiliations

N. Bartolo1,2, D. J. Papoular1, L. Barbiero3,4, C. Menotti1, and A. Recati1

  • 1INO-CNR BEC Center and Dipartimento di Fisica, Università di Trento, 38123 Povo, Italy
  • 2Laboratoire Charles Coulomb, CNRS, Université Montpellier 2, Montpellier, France
  • 3Dipartimento di Fisica e Astronomia “Galileo Galilei”, Universita di Padova, Padova, Italy
  • 4Laboratoire de Physique Théorique, CNRS, Université de Toulouse, Toulouse, France

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Issue

Vol. 88, Iss. 2 — August 2013

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