Doped high- Tc cuprate superconductors elucidated in the light of zeros and poles of the electronic Green's function

Shiro Sakai*, Yukitoshi Motome, Masatoshi Imada

*この研究の対応する著者

研究成果: Article査読

81 被引用数 (Scopus)

抄録

We study electronic structure of hole- and electron-doped Mott insulators in the two-dimensional Hubbard model to reach a unified picture for the normal state of cuprate high- Tc superconductors. By using a cluster extension of the dynamical mean-field theory, we demonstrate that structure of coexisting zeros and poles of the single-particle Green's function holds the key to understand Mott physics in the underdoped region. We show evidence for the emergence of non-Fermi-liquid phase caused by the topological quantum phase transition of Fermi surface by analyzing low-energy charge dynamics. The spectra calculated in a wide range of energy and momentum reproduce various anomalous properties observed in experiments for the high- Tc cuprates. Our results reveal that the pseudogap in hole-doped cuprates has a d -wavelike structure only below the Fermi level while it retains non- d -wave structure with a fully opened gap above the Fermi energy even in the nodal direction due to a zero surface extending over the entire Brillouin zone. In addition to the non- d -wave pseudogap, the present comprehensive identifications of the spectral asymmetry as to the Fermi energy, the Fermi arc, and the back-bending behavior of the dispersion, waterfall, and low-energy kink, in agreement with the experimental anomalies of the cuprates, do not support that these originate from (the precursors of) symmetry breakings such as the preformed pairing and the d -density-wave fluctuations, but support that they are direct consequences of the proximity to the Mott insulator. Several possible experiments are further proposed to prove or disprove our zero mechanism.

本文言語English
論文番号134505
ジャーナルPhysical Review B - Condensed Matter and Materials Physics
82
13
DOI
出版ステータスPublished - 2010 10 4
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学

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