Nonlocal Excitation Spectra in Two-Dimensional Doped Hubbard Model(Condensed matter: electronic structure and electrical, magnetic, and optical properties)
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概要
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Single-particle excitation spectra of the two-dimensional Hubbard model on the square lattice near half filling and at zero temperature are investigated on the basis of the self-consistent projection operator method. The method guarantees a high accuracy of the spectra with high energy and high momentum resolutions. It takes into account long-range intersite correlations as well as the strong on-site correlations. Effects of nonlocal excitations are clarified by comparing the results with those of the single-site approximation. The calculated spectra verify the quantum Monte-Carlo results for finite temperatures. The spectra at the Fermi level yield a hole-like Fermi surface in the underdoped region and an electron-like Fermi surface in the overdoped region. From a numerical analysis of the momentum dependent effective mass and self-energy, it is concluded that a marginal Fermi-liquid like state persists even at finite doping concentrations in the strongly correlated region because a van Hove singularity is pinned to the Fermi surface. It is also found that a kink structure appears in the quasiparticle energy band in the same region. The kink is shown to be caused by a mixing between the quasiparticle band and an excitation band with strong short-range antiferromagnetic correlations. These results suggest an explanation for some of the unusual properties of the normal state in high-T_c cuprates.
- 社団法人日本物理学会の論文
- 2007-07-15
著者
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Fulde Peter
Max-planck-institut Fur Physik Komplexer Systeme
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Fulde Peter
Max-planck-institut Fur Festkorperforschung
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KAKEHASHI Yoshiro
Department of Physics and Earth Sciences, Faculty of Science, University of the Ryukyus
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Kakehashi Yoshiro
Department Of Physics And Earth Sciences Faculty Of Science University Of Ryukyus
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