Charge-density waves in the Hubbard chain: evidence for 4k_F instability

Details Charge-density waves in the Hubbard chain: evidence for 4k_F instability Charge-density waves in the Hubbard chain: evidence for 4k_F instability

2000-02-02

arxiv.org/abs/cond-mat/0002031v1

Phys Rev B 61, 13480 (2000)

Physics

Condensed Matter

Strongly Correlated Electrons

RevTeX, 4 two-column pages with 7 colour figures embedded in text

Scientific paper

10.1103/PhysRevB.61.13480

Charge density waves in the Hubbard chain are studied by means of finite-temperature Quantum Monte Carlo simulations and Lanczos diagonalizations for the ground state. We present results both for the charge susceptibilities and for the charge structure factor at densities \rho=1/6 and 1/3; for \rho=1/2 (quarter filled) we only present results for the charge structure factor. The data are consistent with a 4k_F instability dominating over the 2k_F one, at least for sufficiently large values of the Coulomb repulsion, U. This can only be reconciled with the Luttinger liquid analyses if the amplitude of the 2k_F contribution vanishes above some U^*(\rho).

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