Temperature and Interaction Dependence of the Electron Spectrum in a 2D Attractive Hubbard Model (Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties)

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概要

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• We study the temperature and the interaction dependence of Green's function in the attractive Hubbard model using self-consistent T-matrix approximation (SCTMA). It is found that at low temperatures, the spectrum of electrons on the Fermi surface shows a three-peak structure. On the other hand, at high temperatures, the spectrum has only two peaks. We also find that by increasing the electron-electron attraction, the temperature at which the explained three-peak spectrum appears is decreased. These results are partially explained by the static superconducting fluctuation; however, at strong coupling we need to include the effect of dynamical fluctuation. The "preformed pair" scenario of the pseudogap in high-T_c superconductors and the validity of SCTMA for the BCS-Bose Einstein condensation crossover problem are discussed.

• 2004-03-15

著者

• Ichinomiya Takashi

  Meme Media Laboratory Hokkaido University

関連論文

• Temperature and Interaction Dependence of the Electron Spectrum in a 2D Attractive Hubbard Model (Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties)

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