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

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      https://www.ias.ac.in/article/fulltext/boms/014/04/1049-1052

    • Keywords

       

      Spin fluctuations; quantum spin liquid; Pauli paramagnetism

    • Abstract

       

      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.

    • Author Affiliations

       

      L Hu1 2 K W Yu1

      1. Department of Applied Physics, Hong Kong Polytechnic, Hung Hom, Kowloon, Hong Kong
      2. The Microelectronics Research Institute, Zhongshan University, Guangzhou, People’s Republic of China
    • Dates

       
  • Bulletin of Materials Science | News

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