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

Abstract

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.

13 pages + 1 postscript figure at the end of the file, REVTEX

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