Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2007-01-13
Phys. Rev. B 76, 224515 (2007)
Physics
Condensed Matter
Strongly Correlated Electrons
5 pages, 7 figures
Scientific paper
10.1103/PhysRevB.76.224515
We study the superfluid-Mott-insulator transition of ultracold bosonic atoms in a one-dimensional optical lattice with a double-well confining trap using the density-matrix renormalization group. At low density, the system behaves similarly as two separated ones inside harmonic traps. At high density, however, interesting features appear as the consequence of the quantum tunneling between the two wells and the competition between the "superfluid" and Mott regions. They are characterized by a rich step-plateau structure in the visibility and the satellite peaks in the momentum distribution function as a function of the on-site repulsion. These novel properties shed light on the understanding of the phase coherence between two coupled condensates and the off-diagonal correlations between the two wells.
Jiang Hong-Chen
Weng Zheng-Yu
Xiang Tao
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