EMS Measurement of the Valence Spectral Function of Silicon - a test of Many-body Theory

Abstract

The spectral function A(q,omega) of silicon has been measured along a number of symmetry directions using high-energy high-resolution electron momentum spectroscopy. It is compared with first-principles calculations based on the interacting one-electron Green's function which is evaluated in the GW and the cumulant expansion approximations. Positions of the quasiparticle peaks (dispersion), their widths (lifetimes), and the extensive satellite structures are measured over a broad range of energies and momenta. The band dispersions are well described by both calculations, but the satellite predicted by the GW calculation is not observed. Unlike the GW calculation, the cumulant expansion calculation gives a significantly better description of the shape and momentum dependence of the satellite structure, presenting a promising approach for studying high-energy excitations.The spectral function A(q,omega) of silicon has been measured along a number of symmetry directions using high-energy high-resolution electron momentum spectroscopy. It is compared with first-principles calculations based on the interacting one-electron Green's function which is evaluated in the GW and the cumulant expansion approximations. Positions of the quasiparticle peaks (dispersion), their widths (lifetimes), and the extensive satellite structures are measured over a broad range of energies and momentum dependence of the satellite structure, presenting a promising approach for studying high-energy excitations.

Proceedings of the international meeting on Coincidence Studies of Surfaces, Thin Films and Nanostructures 7.-10.September 2003, Ringberg castle

Cited by in corpus (13)

• Electron-phonon interactions from first principles
• The valence electron photoemission spectrum of semiconductors: ab initio description of multiple satellites
• Quasiparticles and phonon satellites in spectral functions of semiconductors and insulators: Cumulants applied to full first principles theory and Fröhlich polaron
• Band structures of plasmonic polarons
• Revisiting the origin of satellites in core level photoemission of transparent conducting oxides: the case of $n$-doped SnO${}_2$
• Cumulant Green's function calculations of plasmon satellites in bulk sodium: influence of screening and the crystal environment
• Reference Energies for Valence Ionizations and Satellite Transitions
• The GW plus cumulant method and plasmonic polarons: application to the homogeneous electron gas
• Non-linear response in the cumulant expansion for core hole photoemission
• Electron-plasmon interaction induced plasmonic-polaron band replication in epitaxial perovskite SrIrO${}_3$ films
• Optical absorption and photoluminescence of single layer boron nitride from a first principles cumulant approach
• Plasmarons in high-temperature cuprate superconductors
• Beyond on-site Hubbard interaction in charge dynamics of cuprate superconductors