Quantum phases of bosons in double-well optical lattices

I. Danshita, J. E. Williams, C. A. R. Sá de Melo, and C. W. Clark
Phys. Rev. A 76, 043606 – Published 4 October 2007

Abstract

We study the superfluid and insulating phases of bosons in double-well optical lattices, and focus on the specific example of a two-legged ladder, which is currently accessible in experiments. We obtain the zero-temperature phase diagram using both mean-field and time-evolving block decimation techniques. We find that the mean-field approach describes the correct phase boundaries only when the intrachain hopping is sufficiently small in comparison to the on-site repulsion. We show the dependence of the phase diagram on the interchain hopping or tilt between double wells. We find that the Mott-insulator phase at unit filling exhibits a nonmonotonic behavior as a function of the tilt parameter, producing a reentrant phase transition between Mott insulator and superfluid phases. Finally, we determine the critical point separating the insulating and superfluid phases at commensurate fillings, where the Berezinskii-Kosterlitz-Thouless transition occurs.

  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Received 18 May 2007

DOI:https://doi.org/10.1103/PhysRevA.76.043606

©2007 American Physical Society

Authors & Affiliations

I. Danshita1,2, J. E. Williams3, C. A. R. Sá de Melo1,4, and C. W. Clark1

  • 1Joint Quantum Institute, National Institute of Standards and Technology and University of Maryland, Gaithersburg, Maryland 20899, USA
  • 2Department of Physics, Waseda University, 3-4-1 Ōkubo, Shinjuku, Tokyo 169-8555, Japan
  • 3Wolfram Research, Inc., Champaign, Illinois 61820, USA
  • 4School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332, USA

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 76, Iss. 4 — October 2007

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review A

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×