Renormalization of f-levels away from the Fermi energy in electron excitation spectroscopies: Density functional results of Nd${}_{2-x}$Ce${}_x$CuO${}_4$

Abstract

Relaxation energies for photoemission, when an occupied electronic state is excited, and for inverse photoemission, when an empty state is filled, are calculated within the density functional theory with application to Nd${}_{2-x}$Ce${}_x$CuO${}_4$. The associated relaxation energies are obtained by computing differences in total energies between the ground state and an excited state in which one hole or electron is added into the system. The relaxation energies of f-electrons are found to be of the order of several eV's, indicating that f-bands will appear substantially away from the Fermi energy ($E_F$) in their spectroscopic images, even if these bands lie near $E_F$. Our analysis explains why it would be difficult to observe f electrons at the $E_F$ even in the absence of strong electronic correlations.

6 pages, 1 figure, 1 table

References in corpus (5)

• Koopmans' condition for density-functional theory
• GW method applied to localized 4f electron systems
• Neutral and charged excitations in carbon fullerenes from first-principles many-body theories
• Role of Oxygen Electrons in the Metal-Insulator Transition in the Magnetoresistive Oxide La${}_{2-2x}$Sr${}_{1+2x}$Mn${}_2$O${}_7$ Probed by Compton Scattering
• Anisotropic softening of collective charge modes in the vicinity of critical doping in a doped Mott insulator

Cited by in corpus (3)

• Electronic structure and excitations in oxygen deficient CeO${}_{2-\delta }$ from DFT calculations
• Lindhard and RPA susceptibility computations in extended momentum space in electron doped cuprates
• The behavior of f-levels in HCP and BCC rare-earth elements in the ground state and in XPS and BIS spectroscopy from density-functional theory