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The Fermi surface of underdoped high-T_c superconducting cuprates | | Xi Dai
; Zhao-bin Su
; Lu Yu
; | | Date: |
24 Feb 1997 | | Subject: | Strongly Correlated Electrons | cond-mat.str-el | | Abstract: | 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. | | Source: | arXiv, cond-mat/9702209 | | Services: | Forum | Review | PDF | Favorites | |
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