Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Possible Exotic Phases in the One-Dimensional Extended Hubbard Model   We investigate numerically the ground state phase diagram of the
one-dimensional extended Hubbard model, including an on--site interaction U and
a nearest--neighbor interaction V. We focus on the ground state phases of the
model in the V >> U region, where previous studies have suggested the
possibility of dominant superconducting pairing fluctuations before the system
phase separates at a critical value V=V_PS. Using quantum Monte Carlo methods
on lattices much larger than in previous Lanczos diagonalization studies, we
determine the boundary of phase separation, the Luttinger Liquid correlation
exponent K_rho, and other correlation functions in this region. We find that
phase separation occurs for V significantly smaller than previously reported.
In addition, for negative U, we find that a uniform state re-enters from phase
separation as the electron density is increased towards half filling. For V <
V_PS, our results show that superconducting fluctuations are not dominant. The
system behaves asymptotically as a Luttinger Liquid with K_rho < 1, but we also
find strong low-energy (but gapped) charge-density fluctuations at a momentum
not expected for a standard Luttinger Liquid.

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The categories of this paper are: physics
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The categories of this paper are: astro-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-ex
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The categories of this paper are: econ
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The categories of this paper are: cmp-lg
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The categories of this paper are: mtrl-th
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The categories of this paper are: dg-ga
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The categories of this paper are: adap-org
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The categories of this paper are: ao-sci
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The categories of this paper are: comp-gas
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The categories of this paper are: chao-dyn
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The categories of this paper are: math
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The categories of this paper are: alg-geom
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The categories of this paper are: cs