Regensburg 2007 – scientific programme
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MA: Fachverband Magnetismus
MA 4: Electron Theory of Magnetism
MA 4.3: Talk
Monday, March 26, 2007, 10:45–11:00, H23
Recent developments in the theory of angle-resolved photoemission (UPS and XPS) — Jan Minar1, •Juergen Braun2, and Hubert Ebert1 — 1Dep. Chemie und Biochemie, Physikalische Chemie, Universität München, Butenandtstr. 5-13, D-81377 München, Germany — 2Inst. f. Mathematik, Universität Hildesheim, Germany
Recent developments and improvements in the resolution of angle-resolved photoemission experiments in the UPS as well as in the XPS regime require an improved (or revised) theoretical description of the photoemission process based on the one-step model. In particular, in several earlies studies the measured spectra were described either within a single particle approach based on DFT(LSDA) including matrix elements effects or by sophisticated many-body approaches neglecting these effects. In our analysis [1], we combined for the first time electronic correlations with matrix elements effects to achieve an improved interpretation of photoemission data from Ni and Fe. This has been done by means of a combined fully-relativistic self-consistent LSDA+DMFT approach [2].
In the second part we present the results for angle-resolved photoemission of Ag in the soft X-ray range. In particular k∥ and photon momentum transfer effects, which are often neglected in the high energy photoemission, are discussed in detail.[3]
1. J. Braun et al., Phys. Rev. Lett 97, 227601 (2006)
2. J. Minár et al., Phys. Rev. B 72, 45125 (2005)
3. F. Venturini, J. Phys.: Cond. Matt., submitted (2006)