• K W Yu

      Articles written in Bulletin of Materials Science

    • Chemical potential and the self-energy correction of spinors: Further results on the large-U hubbard model

      L Hu K W Yu

      More Details Abstract Fulltext PDF

      The spinor-holon effective Hamiltonian proposed by Zou and Anderson is used to calculate the chemical potential and the self-energy correction of spinors, taking into account the effect of spin exchange interaction. In the superfluid phase, the transition temperature is sensitive to various choices of the on-site Coulomb repulsionU and the band parametert. The correction due to spin fluctuations is extremely important for small doping fractions δ. In the region of δ ≤ 8t2U, the effect of paramagnon fluctuations renders the mean field theory invalid. The paramagnetic susceptibility χ in the long wavelength limit is almost independent of temperatureT at high temperatures. For fixedT, χ increases with doping δ while for fixed δ, χ decreases withT, in qualitative agreement with experiments.

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