2010/05/18 by F. Schmitt, Schmitt, Felix, Markus Hild +3
Physics and Astronomy · #Cold Atom Physics and Bose-Einstein Condensates #FOS: Physical sciences #Quantum Gases (cond-mat.quant-gas)
paper · pdf · doi:10.48550/arxiv.1005.3129
openalex publication_date 2010/05/18 · openalex created_date 2022/09/03 · openalex updated_date 2026/07/28
We investigate the ab-initio phase diagram of ultracold 87-Rb atoms in an\none-dimensional two-color superlattice. Using single-particle band structure\ncalculations we map the experimental setup onto the parameters of the\nBose-Hubbard model. This ab-initio ansatz allows us to express the phase\ndiagrams in terms of the experimental control parameters, i.e., the intensities\nof the lasers that form the optical superlattice. In order to solve the\nmany-body problem for experimental system sizes we adopt the density-matrix\nrenormalization-group algorithm. A detailed study of convergence and\nfinite-size effects for all observables is presented. Our results show that all\nrelevant quantum phases, i.e., superfluid, Mott-insulator, and quasi\nBose-glass, can be accessed through intensity variation of the lasers alone.\nHowever, it turns out that the phase diagram is strongly affected by the\nlongitudinal trapping potential.\n