Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2003-01-14
J. Phys. Soc. Jpn. 72, 225 (2003)
Physics
Condensed Matter
Strongly Correlated Electrons
8 pages, 3 pages, to be published in J. Phys. Soc. Jpn., Vol. 72 No. 2
Scientific paper
10.1143/JPSJ.72.225
The electronic properties of quarter-filled organic materials showing spin-Peierls transition are investigated theoretically. By studying the one-dimensional extended Peierls-Hubbard model analytically as well as numerically, we find that there is a competition between two different spin-Peierls states due to the tetramized lattice distortion in the strongly correlated regime. One is accompanied by lattice dimerization which can be interpreted as a spontaneous Mott insulator, while the other shows the existence of charge order of Wigner crystal-type. Results of numerical density matrix renormalization group computations on sufficiently large system sizes show that the latter is stabilized in the ground state when both the on-site and the inter-site Coulomb interactions are large.
Kuwabara Makoto
Ogata Masao
Seo Hitoshi
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