Dresden 2017 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 61: Correlated Electrons: (General) Theory 2

TT 61.4: Talk

Thursday, March 23, 2017, 10:15–10:30, HSZ 204

L-hole Pocket of the Palladium Fermi Surface Revealed by Positron Annihilation Spectroscopy — •Michael Sekania^1,2, Wilhelm Hans Appelt^3,4, Andreas Östlin¹, Liviu Chioncel^1,4, and Dieter Vollhardt¹ — ¹Theoretical Physics III, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, D-86135 Augsburg, Germany — ²Andronikashvili Institute of Physics, 0177 Tbilisi, Georgia — ³Theoretical Physics II, Institute of Physics, University of Augsburg, D-86135 Augsburg, Germany — ⁴Augsburg Center for Innovative Technologies, University of Augsburg, D-86135 Augsburg, Germany

The existence of the L-hole pocket of the palladium Fermi surface was extensively discussed in the past decades. Although scalar-relativistic density functional theory calculations are not able to reproduce this feature, it is expected that relativistic corrections, among them spin-orbit coupling, are strong enough to create an L-hole pocket. So far, no clear experimental evidence is reported in the literature. In our study we find that relativistic corrections indeed create such a L-hole pocket. Furthermore we show that the computed two dimensional Angular Correlation of Electron Positron Annihilation Radiation (the so called 2D-ACAR) clearly demonstrates the features associated with the L-hole pocket. We also show that electronic correlations do not alter these features significantly. A 2D-ACAR experiment should be able to resolve the disputes concerning the existence of the L-hole pocket in the Palladium Fermi surface.