Physics – Condensed Matter – Superconductivity
Scientific paper
2008-03-05
PHYS. REV. B 77, 104506 (2008)
Physics
Condensed Matter
Superconductivity
8 pages, 5 figures
Scientific paper
10.1103/PhysRevB.77.104506
Recently, angle-resolved photoemission spectroscopy (ARPES) has revealed a dispersion anomaly at high binding energy near 0.3-0.5eV in various families of the high-temperature superconductors. For further studies of this anomaly we present a new two-dimensional fitting-scheme and apply it to high-statistics ARPES data of the strongly-overdoped Bi2Sr2CuO6 cuprate superconductor. The procedure allows us to extract theself-energy in an extended energy and momentum range. It is found that the spectral function of Bi2Sr2CuO6 can be parameterized using a small set of tight-binding parameters and a weakly-momentum-dependent self-energy up to 0.7 eV in binding energy and over the entire first Brillouin zone. Moreover the analysis gives an estimate of the momentum dependence of the matrix element, a quantity, which is often neglected in ARPES analyses.
Baumberger F.
Dunkel W. R.
Eisaki Hiroshi
Lu Ding H.
Meevasana W.
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