Insulating spin liquid in the lightly doped two-dimensional Hubbard model

Details Insulating spin liquid in the lightly doped two-dimensional Hubbard model Insulating spin liquid in the lightly doped two-dimensional Hubbard model

2005-06-25

arxiv.org/abs/cond-mat/0506682v3

Physics

Condensed Matter

Strongly Correlated Electrons

Accepted for publication in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.73.073103

We calculate the charge compressibility and uniform spin susceptibility for the two-dimensional (2D) Hubbard model slightly away from half-filling within a two-loop renormalization group scheme. We find numerically that both those quantities flow to zero as we increase the initial interaction strength from weak to intermediate couplings. This result implies gap openings in both charge and spin excitation spectra for the latter interaction regime. When this occurs, the ground state of the lightly doped 2D Hubbard model may be interpreted as an insulating spin liquid as opposed to a Mott insulating state.

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