Pointlike spindependent interaction in calculations of selfenergy ladder diagrams
Abstract
An instantaneous and zerorange spindependent interaction, derived by summing an infinite number of electronhole ladder diagrams within a local approximation, is analyzed as a function of the electron gas density and the relative spin polarization. The strength of such an interaction is defined by an integral of a statically screened Coulomb interaction with a spatially localized weighting factor. This weighting factor represents the mutually uncorrelated motion of an electronhole pair in singlet or triplet spin states ($S^z=0,\pm1$). An implementation, based on a Yukawatype interaction with a spinpolarizationdependent ThomasFermi screening length, is given.
 Publication:

arXiv eprints
 Pub Date:
 June 2006
 arXiv:
 arXiv:condmat/0606489
 Bibcode:
 2006cond.mat..6489N
 Keywords:

 Condensed Matter  Other
 EPrint:
 5 pages, 3 figures