Incommensurate Mott Insulator in One-Dimensional Electron Systems close to Quarter Filling

Details Incommensurate Mott Insulator in One-Dimensional Electron Systems close to Quarter Filling Incommensurate Mott Insulator in One-Dimensional Electron Systems close to Quarter Filling

2005-01-11

arxiv.org/abs/cond-mat/0501274v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures, submitted to J. Phys. Soc. Jpn. at December 24 2004

Scientific paper

10.1143/JPSJ.74.1922

A possibility of a metal-insulator transition in molecular conductors has been studied for systems composed of donor molecules and fully ionized anions with an incommensurate ratio close to 2:1 based on a one-dimensional extended Hubbard model, where the donor carriers are slightly deviated from quarter filling and under an incommensurate periodic potential from the anions. By use of the renormalization group method, interplay between commensurability energy on the donor lattice and that from the anion potential has been studied and it has been found that an "incommensurate Mott insulator" can be generated. This theoretical finding will explain the metal-insulator transition observed in (MDT-TS)(AuI$_2$)$_{0.441}$.

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