Quasi-Particle Density of States of Two-Dimensional Hubbard Model

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概要

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• The density of states (DOS) of the two-dimensional Hubbard model is calculated in second-order perturbation with respect to the on-site Coulomb interaction U. The direct analytic continuation formula is presented to calculate the self-energy on the real-frequency axis. The momentum as well as the energy integral in the self-energy is seriously carried out with use of the Fast-Fourier-Transformation algorithm. Near the half-filling, the imaginary part of the self-energy becomes proportional to the energy in the vicinity of the Fermi level in our weak-coupling calculation. In the interacting case, the van Hove singularity (VHS) in DOS is smeared by the self-energy effect, but there still exists a sharp peak structure due to VHS.

• 社団法人日本物理学会の論文
• 1995-08-15

著者

• Hotta Takashi

  Institute For Solid State Physics University Of Tokyo

関連論文

• Quasi-Particle Density of States of Two-Dimensional Hubbard Model
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