Superconductivity in the two-dimensional Hubbard model: One-particle correlation functions
- Department of Physics, University of Southern California, Los Angeles, California 90089 (United States)
The one-particle correlation functions of a {ital d}{sub {ital x}}{sup 2}{minus}{ital y}{sup 2} superconducting state in the two-dimensional Hubbard model are investigated within the fluctuation-exchange approximation. This approximation has been previously applied to investigate properties of the Hubbard-model normal state, including incipient instabilities. Results are obtained for the wave vector and temperature dependence of the one-particle energy gap. A miximum gap ratio 2{Delta}{sub {ital k}}{sup max}({ital T}=0)/{ital k}{sub {ital B}}{ital T}{sub {ital c}} of order 10 is obtained for intermediate coupling strengths and electron densities near one per site. The potential appearance of spin excitons in two-particle response functions is discussed.
- OSTI ID:
- 55090
- Journal Information:
- Physical Review, B: Condensed Matter, Vol. 51, Issue 22; Other Information: PBD: 1 Jun 1995
- Country of Publication:
- United States
- Language:
- English
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