Density of states and magnetic susceptibilities on the octagonal tiling

Details Density of states and magnetic susceptibilities on the octagonal tiling Density of states and magnetic susceptibilities on the octagonal tiling

1993-07-19

arxiv.org/abs/cond-mat/9307038v1

Physics

Condensed Matter

8 pages, LaTeX, figures on request

Scientific paper

10.1051/jp1:1994126

We study electronic properties as a function of the six types of local environments found in the octagonal tiling. The density of states has six characteristic forms, although the detailed structure differs from site to site since no two sites are equivalent in a quasiperiodic tiling. We present the site-dependent magnetic susceptibility of electrons on this tiling, which also has six characteristic dependences. We show the existence of a non-local spin susceptibility, which decays with the square of the distance between sites and is the quasiperiodic version of Ruderman-Kittel oscillations. These results are obtained for a tight-binding Hamiltonian with pure hopping.Finally, we investigate the formation of local magnetic moments when electron-electron interactions are included.

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