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Title: Route to supersolidity for the extended Bose-Hubbard model

Abstract

We use the Gutzwiller ansatz and analyze the phase diagram of the extended Bose-Hubbard Hamiltonian with on-site (U) and nearest-neighbor (V) repulsions. For d-dimensional hypercubic lattices, when 2dV<U, it is well known that the ground state alternates between the charge-density-wave (CDW) and Mott insulators, and the supersolid (SS) phase occupies small regions around the CDW insulators. However, when 2dV>U, in this Rapid Communication, we show that the ground state has only CDW insulators, and more importantly, the SS phase occupies a much larger region in the phase diagram, existing up to very large hopping values which could be orders of magnitude higher than that of the well-known case. In particular, the SS-superfluid phase boundary increases linearly as a function of hopping when 2dV > or approx. 1.5U, for which the prospects of observing the SS phase with dipolar Bose gases loaded into optical lattices is much higher.

Authors:
 [1]
  1. Department of Physics, Koc University, Rumelifeneri Yolu, TR-34450 Sariyer, Istanbul (Turkey)
Publication Date:
OSTI Identifier:
21546685
Resource Type:
Journal Article
Journal Name:
Physical Review. A
Additional Journal Information:
Journal Volume: 83; Journal Issue: 5; Other Information: DOI: 10.1103/PhysRevA.83.051606; (c) 2011 American Institute of Physics; Journal ID: ISSN 1050-2947
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 74 ATOMIC AND MOLECULAR PHYSICS; BOSE-EINSTEIN GAS; CHARGE DENSITY; HAMILTONIANS; HUBBARD MODEL; PHASE DIAGRAMS; SUPERFLUIDITY; CRYSTAL MODELS; DIAGRAMS; INFORMATION; MATHEMATICAL MODELS; MATHEMATICAL OPERATORS; QUANTUM OPERATORS

Citation Formats

Iskin, M. Route to supersolidity for the extended Bose-Hubbard model. United States: N. p., 2011. Web. doi:10.1103/PHYSREVA.83.051606.
Iskin, M. Route to supersolidity for the extended Bose-Hubbard model. United States. https://doi.org/10.1103/PHYSREVA.83.051606
Iskin, M. 2011. "Route to supersolidity for the extended Bose-Hubbard model". United States. https://doi.org/10.1103/PHYSREVA.83.051606.
@article{osti_21546685,
title = {Route to supersolidity for the extended Bose-Hubbard model},
author = {Iskin, M},
abstractNote = {We use the Gutzwiller ansatz and analyze the phase diagram of the extended Bose-Hubbard Hamiltonian with on-site (U) and nearest-neighbor (V) repulsions. For d-dimensional hypercubic lattices, when 2dV<U, it is well known that the ground state alternates between the charge-density-wave (CDW) and Mott insulators, and the supersolid (SS) phase occupies small regions around the CDW insulators. However, when 2dV>U, in this Rapid Communication, we show that the ground state has only CDW insulators, and more importantly, the SS phase occupies a much larger region in the phase diagram, existing up to very large hopping values which could be orders of magnitude higher than that of the well-known case. In particular, the SS-superfluid phase boundary increases linearly as a function of hopping when 2dV > or approx. 1.5U, for which the prospects of observing the SS phase with dipolar Bose gases loaded into optical lattices is much higher.},
doi = {10.1103/PHYSREVA.83.051606},
url = {https://www.osti.gov/biblio/21546685}, journal = {Physical Review. A},
issn = {1050-2947},
number = 5,
volume = 83,
place = {United States},
year = {2011},
month = {5}
}