Dresden 2011 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 39: Focussed session: Theory and computation of electronic structure: new frontiers III (jointly with HL, DS)

O 39.6: Vortrag

Mittwoch, 16. März 2011, 12:30–12:45, TRE Phy

(contribution withdrawn) Momentum Distribution and Renormalization Factor in Sodium and the Electron Gas — •Valerio Olevano — Institut Neel, CNRS & UJF, Grenoble, France

The homogeneous electron gas or jellium is one of the most fundamental models, canonical workbench to test different many-body theoretical approaches. Although really simple, still is very close to real solids, especially alkali metals, and sodium is one of its nature's closest realization. Here we present theoretical and also experimental results on the momentum distribution and the quasiparticle renormalization factor in sodium. From an x-ray Compton-profile measurement of the valence-electron momentum density, we derive its discontinuity at the Fermi wavevector. This yields for the first time an accurate measure of the renormalization factor, one of the most important quantities in many-body theory, that we compare with GW and quantum Monte Carlo calculations performed both on crystalline sodium and on the homogeneous electron gas. Our calculated results are in good agreement with the experiment.

References: S. Huotari, J. A. Soininen, T. Pylkkänen, K. Hämäläinen, A. Issolah, A. Titov, J. McMinis, J. Kim, K. Esler, D. M. Ceperley, M. Holzmann, and V. Olevano, Phys. Rev. Lett. 105, 086403 (2010).