Finite-temperature theory of superfluid bosons in optical lattices

被引：20

作者：

Baillie, D. ^{[1
]}

Blakie, P. B. ^{[1
]}

机构：

[1] Univ Otago, Dept Phys, Jack Dodd Ctr Quantum Technol, Dunedin 9016, New Zealand

来源：

PHYSICAL REVIEW A | 2009年 / 80卷 / 03期

关键词：

BOSE-EINSTEIN CONDENSATION; BOGOLIUBOV APPROACH; PHASE-TRANSITION; GASES; ATOMS; INSULATOR; DYNAMICS; STATES;

D O I：

10.1103/PhysRevA.80.033620

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

A practical finite-temperature theory is developed for the superfluid regime of a weakly interacting Bose gas in an optical lattice with additional harmonic confinement. We derive an extended Bose-Hubbard model that is valid for shallow lattices and when excited bands are occupied. Using the Hartree-Fock-Bogoliubov-Popov mean-field approach, and applying local-density and coarse-grained envelope approximations, we arrive at a theory that can be numerically implemented accurately and efficiently. We present results for a three-imensional system, characterizing the importance of the features of the extended Bose-Hubbard model and compare against other theoretical results and show an improved agreement with experimental data.

引用

页数：19

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