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

Aryasetiawan, Ferdi
Department of Physics, Division of Mathematical Physics, Lund University, Sweden
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Published in:
 Physical Review B.  2015, vol. 91, no. 12, p. 125142
English
We show that the dynamical screening of the Coulomb interaction among Cud electrons in highTc 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

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Physics

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https://folia.unifr.ch/unifr/documents/304351
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