Dresden 2017 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 20: Poster Session: Correlated Electrons 2

TT 20.3: Poster

Montag, 20. März 2017, 15:00–19:00, P2-OG1

Systematic analysis of Lock-Crisp-West (LCW) back-folding — •Markus Dutschke¹, Michael Sekania^1,2, and Liviu Chioncel^1,3 — ¹Theoretical Physics III, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, D-86135 Augsburg, Germany — ²Andronikashvili Institute of Physics, Tamarashvili 6, 0177 Tbilisi, Georgia — ³Augsburg Center for Innovative Technologies, University of Augsburg, D-86135 Augsburg, Germany

The LCW theorem provides a analytic transformation of the momentum distribution, obtained either by Compton profile or positron angular correlation measurements, into the electronic distribution in the irreducible part of the Brillouin zone. It is typically employed to identify Fermi surface sheets as discontinuities of the obtained data for the system under consideration. In practice, however, the measured or computed projected momentum distributions are of finite precision and limited in momentum range. These restrictions introduce artificial discontinuities in the LCW back-folded data, resulting in unphysical Fermi surface features. In our study we present a systematic analysis of different practical LCW implementations, which reduce artifacts of the transformation and increase accuracy. We present results for elemental bcc and fcc metals with already well known Fermi surfaces.