Phase diagram of the one-dimensional extended Hubbard model at quarter filling

Дата и время публикации : 1993-02-06T15:22:00Z

Авторы публикации и институты :
Frederic Mila
Xenophon Zotos

Ссылка на журнал-издание: Ссылка на журнал-издание не найдена
Коментарии к cтатье: 13 pages + 1 postscript figure at the end of the file, REVTEX
Первичная категория: cond-mat

Все категории : cond-mat

Краткий обзор статьи: We used exact diagonalization of small clusters and exact results in various limits to determine the phase diagram and the critical exponents of the one dimensional (1D) $U-V$ model at quarter-filling. We found an instability of the Luttinger liquid to a charge-density wave (CDW) insulator across a boundary going from ($U$,$V$) =($+infty$,$2t$) to ($4t$,$+infty$). In the metallic phase, the dominant fluctuations are superconducting if $V$ is large enough and spin-density wave (SDW) otherwise. In the latter case, the critical exponent $alpha$ of the momentum distribution does not exceed 9/16. The relevance of these results to 1D organic conductors is discussed.

Category: Physics