Fermi-liquid phase of the t-J model and the Hall coefficient in the high-temperature superconductors
C. A. R. Sá de Melo, Ziqiang Wang, S. Doniach
DOI 10.1103/PhysRevLett.68.2078 · Physical Review Letters
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Abstract
The Hall coefficient in the strongly correlated Fermi-liquid phase of the t-J model is studied for moderate hole concentrations. We find that the quasiparticle self-energy is strongly k dependent due to gauge-field interactions. It leads to corrections to the Fermi-surface curvature and to enhancement of the quasiparticle lifetime in the holelike region. We show that a systematic treatment of the strong local correlations to next to leading order in 1/N is sufficient to give rise to a sign change in the Hall coefficient. This effect occurs near 0.20 doping for J/t=0.2 and may be relevant to the high-Tc materials.
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