2007/10/31 by M. Machida, Masahiko Machida, M. Okumura +2
Physics and Astronomy · #Cold Atom Physics and Bose-Einstein Condensates #Physics of Superconductivity and Magnetism #Strong Light-Matter Interactions #cond-mat.str-el
paper · pdf · doi:10.1103/physreva.77.033619
published as Phys. Rev. A 77, 033619 (2008)
openalex publication_date 2008/03/19 · arxiv created 2008/04/14 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We suggest that a box shape trap enables one to observe intrinsic properties of the repulsive Hubbard model in a fixed doping in contrast to the conventional harmonic trap bringing about spatial variations of atom density profiles. In order to predict atomic density profile under the box trap, we apply the directly extended density-matrix renormalization-group method to a four-leg repulsive Hubbard model with the open boundary condition. Consequently, we find that stripe formation is universal in a low-hole-doping range and the stripe sensitively changes its structure with variations of U∕t and the doping rate. A remarkable change is that a stripe formed by a hole pair turns to one by a bihole pair when entering a limited strong U∕t range. Furthermore, a systematic calculation reveals that the Hubbard model shows a change from the stripe to the Friedel like oscillation with increasing the doping rate.