The Fermi surface of underdoped high-T_c superconducting cuprates

Details The Fermi surface of underdoped high-T_c superconducting cuprates The Fermi surface of underdoped high-T_c superconducting cuprates

1997-02-24

arxiv.org/abs/cond-mat/9702209v2

Physics

Condensed Matter

Strongly Correlated Electrons

18 pages RevTex, 6 figures in PS files

Scientific paper

10.1016/S0921-4534(97)00918-0

The coexistence of $\pi$-flux state and d-wave RVB state is considered in this paper within the slave boson approach. A critical value of doping concentration $\delta_c$ is found, below which the coexisting $\pi$-flux and d-wave RVB state is favored in energy. The pseudo Fermi surface of spinons and the physical electron spectral function are calculated. A clear Fermi-level crossing is found along the (0,0) to ($\pi$, $\pi$) direction, but no such crossing is detected along the ($\pi$, 0) to ($\pi$, $\pi$) direction. Also, an energy gap of d-wave symmetry appears at the Fermi level in our calculation. The above results are in agreement with the angle-resolved photoemission experiments which indicate at a d-wave pseudo-gap and a half-pocket-like Fermi surface in underdoped cuprates.

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