Berlin 2012 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 35: Poster Session II (Polymeric biomolecular films; Nanostructures; Electronic structure; Spin-orbit interaction; Phase transitions; Surface chemical reactions; Heterogeneous catalysis; Particles and clusters; Surface magnetism; Electron and spin dynamics; Surface dynamics; Methods; Electronic structure theory; Functional molecules)
O 35.36: Poster
Dienstag, 27. März 2012, 18:15–21:45, Poster B
Two-dimensional fitting data analysis in Angle-resolved photoemission spectroscopy — •Lucas Barreto, Richard Hatch, Marco Bianchi, and Philip Hofmann — Department of Physics and Astronomy, Interdisciplinary Nanoscience Center, Aarhus University, 8000 Aarhus C, Denmark
Angle-resolved photoemission spectroscopy (ARPES) is a well-established technique used to investigate the electronic properties of materials. ARPES data is frequently analyzed by considering scans taken at fixed emission-angle (EDC) or binding energy (MDC). In a number of cases, however, this approach does not permit one to extract all the useful information and may even lead to a misinterpretation of results [1]. Furthermore, recent ARPES developments have heightened the importance of analyzing the entire two-dimensional data set. Assuming an initial dispersion and a self-energy, the spectral function is calculated and then, using a search procedure, the parameters are optimized in order to obtain a good agreement between the measured and calculated spectra. The customary way to perform this search is to minimize χ2. In this work, we propose an alternative way of comparing the calculated and the measured spectra that gives more weight to the regions with higher intensities by using derivatives. We will present results of both methodologies for ARPES measurements on Bi2Se3 exposed to CO [2] and compare the two methods in order to verify the applicability of the suggested approach.
[1] I. A. Nechaev et al. PRB, 80,113402 (2009).
[2] M. Bianchi et al. PRL,107,086802 (2011).