Route to supersolidity for the extended Bose-Hubbard model

Iskin, M

doi:10.1103/PHYSREVA.83.051606

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

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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:

Iskin, M ^[1]

Department of Physics, Koc University, Rumelifeneri Yolu, TR-34450 Sariyer, Istanbul (Turkey)

Publication Date:: Sun May 15 00:00:00 EDT 2011

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

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                    Iskin, M. Route to supersolidity for the extended Bose-Hubbard model.  United States: N. p., 2011. 
        Web.  doi:10.1103/PHYSREVA.83.051606.

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                    Iskin, M. Route to supersolidity for the extended Bose-Hubbard model.  United States.  https://doi.org/10.1103/PHYSREVA.83.051606

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                    Iskin, M. 2011.  
        "Route to supersolidity for the extended Bose-Hubbard model".  United States.  https://doi.org/10.1103/PHYSREVA.83.051606.

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@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         = {Sun May 15 00:00:00 EDT 2011},

  month        = {Sun May 15 00:00:00 EDT 2011}

}

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