Thursday, June 13, 2013

1306.2667 (G. Levy et al.)

Deconstruction of Resolution Effects in Angle-Resolved Photoemission    [PDF]

G. Levy, W. Nettke, B. M. Ludbrook, C. N. Veenstra, A. Damascelli
We study how the energy and momentum resolution of angle-resolved photoemission spectroscopy (ARPES) affects the linewidth, Fermi crossing, velocity, and curvature of the measured band structure. Based on the fact that the resolution smooths out the spectra, and therefore acts as a low-pass filter, we develop an iterative simulation scheme which compensates for resolution effects and allows the fundamental physical parameters to be accurately extracted. By simulating a realistic band structure, we have verified that this method works for an energy resolution up to 100meV and a momentum resolution equal to twice the energy resolution scaled by the Fermi velocity. Our analysis acquires particular relevance in the hard and soft X-ray regimes, where a degraded resolution limits the accuracy of the extracted physical parameters, and therefore opens a path to study how the electronic excitations are modified when the ARPES probing depth increases beyond the surface.
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