Staggered ground states in an optical lattice

Johnstone, D., Westerberg, N. , Duncan, C. W. and Öhberg, P. (2019) Staggered ground states in an optical lattice. Physical Review A: Atomic, Molecular and Optical Physics, 100(4), 043614. (doi: 10.1103/PhysRevA.100.043614)

Abstract

Nonstandard Bose-Hubbard models can exhibit rich ground-state phase diagrams, even when considering the one-dimensional limit. Using a self-consistent Gutzwiller diagonalization approach, we study the mean-field ground-state properties of a long-range interacting atomic gas in a one-dimensional optical lattice. We first confirm that the inclusion of long-range two-body interactions to the standard Bose-Hubbard model introduces density-wave and supersolid phases. However, the introduction of pair and density-dependent tunneling can result in new phases with two-site periodic density, single-particle transport, and two-body transport order parameters. These staggered phases are potentially a mean-field signature of the known novel twisted superfluids found via a density-matrix renormalization group approach [Phys. Rev. A 94, 011603(R) (2016)]. We also observe other unconventional phases which are characterized by sign staggered order parameters between adjacent lattice sites.

• Item Type: Articles
• Additional Information: D.J., N.W., and C.W.D. acknowledge support from EPSRC CM-CDT Grant No. EP/L015110/1. P.Ö. acknowledges support from EPSRC Grant No. EP/M024636/1.
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Westerberg, Dr Niclas
• Authors: Johnstone, D., Westerberg, N., Duncan, C. W., and Öhberg, P.
• College/School: College of Science and Engineering > School of Physics and Astronomy
• Journal Name: Physical Review A: Atomic, Molecular and Optical Physics
• Publisher: American Physical Society
• ISSN: 1050-2947
• ISSN (Online): 1094-1622
• Published Online: 24 October 2019
• Copyright Holders: Copyright © 2019 American Physical Society
• First Published: First published in Physical Review A: Atomic, Molecular and Optical Physics 100(4): 043614
• Publisher Policy: Reproduced in accordance with the publisher copyright policy