title: Momentum distribution and renormalization factor in sodium and the electron gas.
abstract: We present experimental and theoretical 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 wave vector. This yields an accurate measure of the renormalization factor that we compare with quantum Monte Carlo and G0W0 calculations performed both on crystalline sodium and on the homogeneous electron gas.
authors.affiliation: European Synchrotron Radiation Facility, BP 220, F-38043 Grenoble, France.
authors.forename: Simo
authors.initials: S
authors.lastname: Huotari
authors.forename: J Aleksi
authors.initials: JA
authors.lastname: Soininen
authors.forename: Tuomas
authors.initials: T
authors.lastname: Pylkkänen
authors.forename: Keijo
authors.initials: K
authors.lastname: Hämäläinen
authors.forename: Arezki
authors.initials: A
authors.lastname: Issolah
authors.forename: Andrey
authors.initials: A
authors.lastname: Titov
authors.forename: Jeremy
authors.initials: J
authors.lastname: McMinis
authors.forename: Jeongnim
authors.initials: J
authors.lastname: Kim
authors.forename: Ken
authors.initials: K
authors.lastname: Esler
authors.forename: David M
authors.initials: DM
authors.lastname: Ceperley
authors.forename: Markus
authors.initials: M
authors.lastname: Holzmann
authors.forename: Valerio
authors.initials: V
authors.lastname: Olevano