Role of Strong Correlation in the Recent Angle-Resolved Photoemission Spectroscopy Experiments on Cuprate Superconductors

Journal Article · Sat Jan 01 00:00:00 EST 2005 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.94.037001· OSTI ID:1003064

Yunoki, S. ^[1]; Dagotto, Elbio R ^[2]; Sorella, S. ^[1]

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1. Istituto Nazionale per la Fisica della Materia and International School, Italy
2. ORNL

Motivated by recent photoemission experiments on cuprates, the low-lying excitations of a strongly correlated superconducting state are studied numerically. It is observed that along the nodal direction these low-lying one-particle excitations show a linear momentum dependence for a wide range of excitation energies and, thus, they do not present a kinklike structure. The nodal Fermi velocity vF, as well as other observables, are systematically evaluated directly from the calculated dispersions, and they are found to compare well with experiments. It is argued that the parameter dependence of v{sub F} is quantitatively explained by a simple picture of a renormalized Fermi velocity.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 1003064
• Journal Information: Physical Review Letters, Vol. 94, Issue 3; ISSN 0031--9007
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CORRELATIONS
CUPRATES
DISPERSIONS
EXCITATION
LINEAR MOMENTUM
PHOTOEMISSION
RANGE
SPECTROSCOPY
SUPERCONDUCTORS
VELOCITY