Fermi surface of underdoped high-T{sub c} superconducting cuprates
- Institute of Theoretical Physics, Academia Sinica, P.O. Box 2735, Beijing 100080 (China)
- International Center for Theoretical Physics, P.O. Box 586, Trieste 34100 (Italy)
The coexistence of a {pi}-flux state and a d-wave resonant-valance-bond (RVB) state is considered in this paper within the slave-boson approach. A critical value of doping concentration {delta}{sub 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 pseudogap and a half-pocket-like Fermi surface in underdoped cuprates. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 538586
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 9 Vol. 56; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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