Speaker
Viktor Christiansson
Description
Experimentally simple cubic phosphorus displays a peculiar pressure-$T_c$ curve with valley- and ridge-like features between 12 and 50 GPa. From the theoretical side, a simple electron-phonon mechanism proves insufficient to describe this behaviour. To address possible effects coming from electronic correlations and plasmonic contributions we have solved the parameter free gap equation of density functional theory for superconductors. We find that an electron-electron interaction kernel obtained from a one-shot $GW$ calculation predicts values of $T_c$ in the correct range. Additionally including a correction of the band structure from the quasi-particle energies significantly improves $T_c$ in the high-pressure region.
Author
Viktor Christiansson
Co-authors
Dr
Francesco Petocchi
(University of Fribourg)
Philipp Werner
(University of Fribourg)
