Regensburg 2019 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
O: Fachverband Oberflächenphysik
O 53: 2D Materials II: Transition Metal Dichalcogenides
O 53.7: Vortrag
Mittwoch, 3. April 2019, 12:00–12:15, H16
Impact of excitons in transition metal dichalcogenides on time-resolved ARPES — •Dominik Christiansen1, Malte Selig1, Ermin Malic2, and Andreas Knorr1 — 1Technische Universität Berlin, Institut für Theoretische Physik, Nichtlineare Optik und Quantenelektronik, Berlin, Germany — 2Chalmers University of Technology, Department of Physics, Gothenburg, Sweden
Time- and angle resolved photoemission spectroscopy (trARPES) allows to study the dynamics of electronic excitations exploiting the photoelectric effect: A VIS pump pulse creates a non-equilibrium electron occupation dynamics detected by a time delayed XUV probe pulse, examplary performed in ultrathin transition metal dichalcogenides (TMDs) [1]. However, these materials exhibit strongly bound excitons, a complex quasi-particle band structure and their interplay dominate the trARPES spectrum [2].
Here, we develope an excitonic theory of time- and angle resolved photoemission spectroscopy investigating the exciton dynamics at different high symmetry points of the Brillouin zone [3].
[1] R. Bertoni et. al., Phys. Rev. Lett. 117, 277201 (2016)
[2] A. Steinhoff et. al., Nat. Commun. 8, 1166 (2017)
[3] M. Selig et. al., 2D Mater. 5, 035017 (2018)