<abstract xmlns="http://www.w3.org/1999/xhtml"><p>The influence of the positron distribution on the electron-positron (e-p) momentum densities (MDs) is studied in terms of the <italic>l</italic> (<italic>l = s, p, d, f</italic>) character of the initial electronic state. The effect of the positron is discussed for momenta in the extended and reduced zone scheme on the example of Al (simple metal), Cu (metal with almost filled <italic>d</italic> shell), and Cr (transition metal). Present result indicates a weak sensitivity of the e-p MD inside the central Fermi surface to the positron charge density for the delocalized <italic>s</italic> and <italic>p</italic> electrons. In the case of <italic>d</italic> states, the effect of the positron on the relevant contribution to the e-p MD directly reflects the degree of localization of <italic>d</italic> electrons in the electron density of states.</p></abstract>

The influence of the positron distribution on the electron-positron (e-p) momentum densities (MDs) is studied in terms of the l (l = s, p, d, f) character of the initial electronic state. The effect of the positron is discussed for momenta in the extended and reduced zone scheme on the example of Al (simple metal), Cu (metal with almost filled d shell), and Cr (transition metal). Present result indicates a weak sensitivity of the e-p MD inside the central Fermi surface to the positron charge density for the delocalized s and p electrons. In the case of d states, the effect of the positron on the relevant contribution to the e-p MD directly reflects the degree of localization of d electrons in the electron density of states.

Understanding electron-positron momentum densities in solids: effect of the positron distribution

W. Trzebiatowski Institute of Low Temperatures and Structure Research, Polish Academy of Sciences, P. O. Box 1410, 50-950 Wrocław 2, Poland, Tel.: +48 71 395 4272, Fax: +48 71 344 1029

Nukleonika

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

The influence of the positron distribution on the electron-positron (e-p) momentum densities (MDs) is studied in terms of the l (l = s, p, d, f) character of...

Understanding electron-positron momentum densities in solids: effect of the positron distribution

Published Online: Dec 01, 2015

Page range: 759 - 763

Received: Jun 22, 2015

Accepted: Aug 12, 2015

DOI: https://doi.org/10.1515/nuka-2015-0137

Keywords
positron annihilation, electronic band structure, positron states

© 2015 Anna Rubaszek, published by De Gruyter Open

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Understanding electron-positron momentum densities in solids: effect of the positron distribution

Published Online: Dec 01, 2015

Page range: 759 - 763

Received: Jun 22, 2015

Accepted: Aug 12, 2015

DOI: https://doi.org/10.1515/nuka-2015-0137

Keywordspositron annihilation, electronic band structure, positron states

© 2015 Anna Rubaszek, published by De Gruyter Open

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Keywords
positron annihilation, electronic band structure, positron states