Dynamical Properties of the One-Dimensional Hubbard Model : A Numerical Study

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概要

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• We investigate the dynamical properties of the one-dimensional Hubbard model us-ing the quantum Monte Cargo method and the numerical analytic continuationmethod based on the maximum entropy principle. Results for the spin, charge andcurrent excitation spectrum are presented for various values of the coupling and theband filling for the system of 24 sites with the periodic boundary condition. We findthat the total spectral density of the spin excitation exhibits a gapless structure ir-respective of the coupling or the band filling. The charge excitation spectrum, on theother hand, clearly shows the gap formation at the half filled band and shifts itsweight toward the higher energy region with increase of the coupling. This charge excitation gap, however, disappears with the hole doping. We also discuss the momentum dependence of the spectral functions.

• 社団法人日本物理学会の論文
• 1991-11-15

著者

• Otsuka Hiromi

  Department Of Physics Faculty Of Science Osaka University

• Otsuka Hiromi

  Department Of Orthopaedics Aichi Medical University

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