### Abstract

We study the superfluid-Mott insulator (SF-MI) transition in a two-dimensional optical lattice system and employ the Bose-Hubbard model in three dimensions with a combined potential of an optical lattice in two directions and a confining harmonic trap in the other direction, which we refer to as the pseudo-two-dimensional Bose-Hubbard model. Some excited states with respect to the harmonic trap are taken into account in this paper. The Mott lobes shrink in the μ and J directions of the μ-J phase diagram. The shrinkage occurs because the interactions involving the excited states become weaker than that between particles in the ground state. The dispersion of the in-site particle number increases because the energy spacing between the eigenstates of the Hamiltonian decreases at finite temperature. The presence of the excited states significantly affects the robustness of the MI phase at finite temperature.

Original language | English |
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Article number | 165303 |

Journal | Journal of Physics B: Atomic, Molecular and Optical Physics |

Volume | 44 |

Issue number | 16 |

DOIs | |

Publication status | Published - 2011 Aug 28 |

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### ASJC Scopus subject areas

- Condensed Matter Physics
- Atomic and Molecular Physics, and Optics

### Cite this

*Journal of Physics B: Atomic, Molecular and Optical Physics*,

*44*(16), [165303]. https://doi.org/10.1088/0953-4075/44/16/165303

**Effects of finite temperature on the robustness of the Mott insulator phase in a pseudo-two-dimensional Bose-Hubbard model.** / Inoue, Motoyoshi; Kobayashi, Keita; Nakamura, Yusuke; Yamanaka, Yoshiya.

Research output: Contribution to journal › Article

*Journal of Physics B: Atomic, Molecular and Optical Physics*, vol. 44, no. 16, 165303. https://doi.org/10.1088/0953-4075/44/16/165303

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TY - JOUR

T1 - Effects of finite temperature on the robustness of the Mott insulator phase in a pseudo-two-dimensional Bose-Hubbard model

AU - Inoue, Motoyoshi

AU - Kobayashi, Keita

AU - Nakamura, Yusuke

AU - Yamanaka, Yoshiya

PY - 2011/8/28

Y1 - 2011/8/28

N2 - We study the superfluid-Mott insulator (SF-MI) transition in a two-dimensional optical lattice system and employ the Bose-Hubbard model in three dimensions with a combined potential of an optical lattice in two directions and a confining harmonic trap in the other direction, which we refer to as the pseudo-two-dimensional Bose-Hubbard model. Some excited states with respect to the harmonic trap are taken into account in this paper. The Mott lobes shrink in the μ and J directions of the μ-J phase diagram. The shrinkage occurs because the interactions involving the excited states become weaker than that between particles in the ground state. The dispersion of the in-site particle number increases because the energy spacing between the eigenstates of the Hamiltonian decreases at finite temperature. The presence of the excited states significantly affects the robustness of the MI phase at finite temperature.

AB - We study the superfluid-Mott insulator (SF-MI) transition in a two-dimensional optical lattice system and employ the Bose-Hubbard model in three dimensions with a combined potential of an optical lattice in two directions and a confining harmonic trap in the other direction, which we refer to as the pseudo-two-dimensional Bose-Hubbard model. Some excited states with respect to the harmonic trap are taken into account in this paper. The Mott lobes shrink in the μ and J directions of the μ-J phase diagram. The shrinkage occurs because the interactions involving the excited states become weaker than that between particles in the ground state. The dispersion of the in-site particle number increases because the energy spacing between the eigenstates of the Hamiltonian decreases at finite temperature. The presence of the excited states significantly affects the robustness of the MI phase at finite temperature.

UR - http://www.scopus.com/inward/record.url?scp=80051682567&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=80051682567&partnerID=8YFLogxK

U2 - 10.1088/0953-4075/44/16/165303

DO - 10.1088/0953-4075/44/16/165303

M3 - Article

AN - SCOPUS:80051682567

VL - 44

JO - Journal of Physics B: Atomic, Molecular and Optical Physics

JF - Journal of Physics B: Atomic, Molecular and Optical Physics

SN - 0953-4075

IS - 16

M1 - 165303

ER -