# Dynamical screening in ${\text{La}}_{2}{\text{CuO}}_{4}$

• Werner, Philipp Department of Physics, University of Fribourg, Switzerland
• Sakuma, Rei Department of Physics, Division of Mathematical Physics, Lund University, Sweden
• Nilsson, Fredrik Department of Physics, Division of Mathematical Physics, Lund University, Sweden
26.03.2015
Published in:
• Physical Review B. - 2015, vol. 91, no. 12, p. 125142
English We show that the dynamical screening of the Coulomb interaction among Cu-d electrons in high-Tc cuprates is strong and that a proper treatment of this effect is essential for a consistent description of the electronic structure. In particular, we find that ab initio calculations for undoped La2CuO4 in the paramagnetic phase yield an insulator only if the frequency dependence of the Coulomb interaction and the interatomic interaction between p and d electrons are taken into account. We also identify a collective excitation in the screened interaction at 9 eV, which is rather localized on the copper site, and which is responsible for a satellite structure at energy −13 eV, located below the p bands.
Faculty
Faculté des sciences et de médecine
Department
Département de Physique
Language
• English
Classification
Physics