Sensitivity of electron and electron-positron momentum densities to various electron and positron crystal potentials - art. no. 045102

This paper presents a comprehensive survey of the influence of various crys tal potentials used for the calculation of electron and positron Bloch stat es on electron and electron-positron momentum densities. Our investigation deals with alkali metals and the complete series of 4sp and 3d metals. and it covers the behavior of both valence and core electrons as well as the ce ntral momentum region and some umklapp regions. The main results of this pa per are the following: (i) The sensitivity of the electron-positron momentu m density with respect to various crystal potentials is significantly highe r for 4sp and 3d metals than for alkali metals. (ii) For all metals of the 3d series, the electron-positron momentum densities are generally more sens itive to the potentials than the corresponding electron momentum densities. Possible complications regarding the comparison of theoretical and experim ental electron-positron momentum profiles, and means for extracting informa tion on electron-positron interaction, are also discussed.