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Ultrafast Electron Dynamics in Epitaxial Graphene Investigated with Time- and Angle-Resolved Photoemission Spectroscopy
Søren Ulstrup, Jens Christian Johannsen, Alberto Crepaldi +11
In order to exploit the intriguing optical properties of graphene it is essential to gain a better understanding of the light-matter interaction in the material on ultrashort times…
Ramifications of Optical Pumping on the Interpretation of Time-Resolved Photoemission Experiments on Graphene
Søren Ulstrup, Jens Christian Johannsen, Federico Cilento +13
In pump-probe time and angle-resolved photoemission spectroscopy (TR-ARPES) experiments the presence of the pump pulse adds a new level of complexity to the photoemission process i…
Measuring Fermi velocities with ARPES in narrow band systems. The case of layered cobaltates
V. Brouet, A. Nicolaou, M. Zacchigna +3
ARPES is a priori a technique of choice to measure the Fermi velocities vF in metals. In correlated systems, it is interesting to compare this experimental value to that obtained i…
New electronic orderings observed in cobaltates under the influence of misfit periodicities
A. Nicolaou, V. Brouet, M. Zacchigna +10
We study with ARPES the electronic structure of CoO2 slabs, stacked with rock-salt (RS) layers exhibiting a different (misfit) periodicity. Fermi Surfaces (FS) in phases with diffe…
Experimental study of the incoherent spectral weight in the photoemission spectra of the misfit cobaltate [Bi2Ba2O4][CoO2]2
A. Nicolaou, V. Brouet, M. Zacchigna +8
Previous ARPES experiments in NaxCoO2 reported both a strongly renormalized bandwidth near the Fermi level and moderately renormalized Fermi velocities, leaving it unclear whether…
Direct observation of strong correlations near the band insulator regime of Bi misfit cobaltates
V. Brouet, A. Nicolaou, M. Zacchigna +6
We present the first angle-resolved photoemission (ARPES) measurement of Fermi Surface in the "misfit" cobaltate [Bi2Ba2O4].[CoO2]~2. This compound contains the same triangular Co…