Speaker
Lukas Hellbrück
(EPFL)
Description
The relation between the pseudogap phase and the superconducting dome in high Tc superconductors is still not well understood despite intense research. To develop better insight into this relation and understand the electronic properties of these materials, we study the Fermi surface via time- and angle-resolved photoemission spectroscopy (tr-ARPES). We measure the size and topology of the Fermi surface, allowing us to quantify the carrier density and the charge interactions. For Bi2212 at 22% doping, the Fermi surface shows a pump induced Lifshitz transition, accompanied by the lack of a pseudogap. For optimally doped Bi2212, we observe a Lifshitz transition (from hole-like to e- like) at high fluences of light.
Author
Lukas Hellbrück
(EPFL)
Co-authors
Ji Dai
(ji.dai@epfl.ch)
Siham Benhabib
(EPFL)
Puppin Michele
(EPFL)
Alberto Crepaldi
(EPFL)
Marco Grioni
(EPFL)
Henrik Ronnow
(EPFL - EPF Lausanne)
Fabrizio Carbone
(EPFL)
