Influence of Many-Body Effects in Real Metals on Electron-Positron Momentum Distributions |

E. BoroĊski,
Institute of Physics, Opole University, Oleska 48, 45-052 Opole, Poland |

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It is shown that if one takes into account the effective mass of the electron, which in real structures is actually different than the free electron mass, the electron and positron self-energy effects may result in flatter and smaller enhancement of the electron-positron momentum distribution. Thus, the many-body effects mentioned above, among other reasons like e.g. influence of lattice potential on electron and positron wave functions, can be responsible for decreasing of the discontinuity on the Fermi momentum and a greater smearing of the Fermi surface seen in several angular correlation of positron annihilation radiation experiments. |

DOI: 10.12693/APhysPolA.125.706 PACS numbers: 78.70.Bj, 71.18.+y, 71.60.+z, 71.15.Mb, 71.10.Ca |