Abstract's Details

Extracting the Spectral Function of the Cuprates by a Full 2D Analysis
Abstract ID	MAT-16
Presenter	Worawat Meevasana
Presentation Type	Poster
Full Author List	W. Meevasana (1), F. Baumberger (2), K. Tanaka (1, 3), F. Schmitt (1), W. R. Dunkel (1), D. H. Lu (1), S.-K. Mo (1,3), H. Eisaki (4), Z.-X. Shen (1)
Affiliations	(1) Dept. of Physics, Applied Physics, and Stanford Synchrotron Radiation Laboratory, Stanford University, Stanford, CA 94305 (2) School of Physics and Astronomy, University of St. Andrews, Fife KY16 9SS, UK (3) Advanced Light Source, Lawrence Berkeley National Lab, Berkeley, CA 94720 (4) Nanoelectronic Research Institute, AIST, Tsukuba 305-0032, Japan
Category	Materials Science
Abstract	Recently, angle-resolved photoemission spectroscopy (ARPES) has revealed a dispersion anomaly at high binding energy near 0.3-0.5 eV 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 the self-energy in an extended energy and momentum range without any a-priori assumptions. 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 half of the 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.
Footnotes
Funding Acknowledgement	W.M. would like to thank D. van der Marel, E. van Heumen and N. J. C. Ingle for discussions. The work at SSRL and ALS are supported by DOE's Office of Basic Energy Sciences under Contracts No. DE-AC02-76SF00515 and DE-AC03-76SF00098. This work is also supported by DOE Office of Science, Division of Materials Science, with contract DE-FG03-01ER45929-A001 and NSF grant DMR-0604701. W.M. acknowledges DPST for the financial support.