Strong pairing and microscopic inhomogeneity of lattice fermion systems

✍ Scribed by S. Yamada; M. Machida; Y. Ohashi; H. Matsumoto

• Book ID: 104083509
• Publisher: Elsevier Science
• Year: 2007
• Tongue: English
• Weight: 450 KB
• Volume: 463-465
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/j.physc.2007.05.013

✦ Synopsis

In order to study an interplay between electronic inhomogeneity and superconductivity as seen in high-T c cuprates, we numerically examine attractive Hubbard model in the absence of the translation symmetry. We systematically calculate the particle density profile for both 1-D and 2-D attractive Hubbard models with harmonic potential wells using the exact diagonalization and the density-matrix renormalization group methods. The numerical results reveal that fine inhomogeneous zig-zag patterns universally emerge in the 1-D model case and the zig-zag structure becomes checkerboard type in the 2-D one. Moreover, it is numerically and theoretically found that such inhomogeneities are caused by double occupation component, i.e., pairs tightly bound on a site.