Seminars Archive

Exploring the phase diagram of cuprates by time- and angle-resolved photoemission spectroscopy

Abstract
The phase diagram of copper-oxides hosts intertwined phases as disparate as high-temperature superconductivity, charge order and the pseudogap. In the last decade the development of time-resolved techniques has offered a novel perspective for investigating dynamical properties of copper-oxides and exploring the similarities and differences between the two sides of the cuprates phase diagram. In this regard, we recently demonstrated the potential of time- and angle-resolved photoemission spectroscopy (TR-ARPES) as a technique to directly access the dynamics of phase fluctuations and charge excitation, establishing the dominant role of phase coherence in the emergence of high-temperature superconductivity in Bi-based hole-doped cuprates [1]. By employing this same dynamical approach, we revealed unambiguously the relation of the pseudogap and short-range antiferromagnetic correlations in optimally-doped NCCO electron-doped cuprate [2], providing clear evidence of the role of short-range correlations in defining the Fermi surface topology. Finally, we propose a way to redefine the paradigms of the TR-APRES analysis accessing the mode-projected electron-phonon matrix element in graphite in an ultrafast fashion [3]. [1] Boschini et al., Nat. Mat. 17, 416 (2018) [2] Boschini*, Zonno* et al., arXiv:1812.07583 (2018) [3] Na*, Mills*, Boschini et al., arXiv:1902.05572 (2019)