Regensburg 2025 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 57: Ultrafast Electron Dynamics I
O 57.7: Vortrag
Mittwoch, 19. März 2025, 12:15–12:30, H2
Characterization of Excitons for bulk Black Phosphorus — •Juan Felipe Pulgarin Mosquera1,2, Geoffroy Kremer2,3, Claude Monney2, and Michael Schueler1,2 — 1PSI Center for Scientific Computing, Theory and Data, 5232 Villigen PSI, Switzerland — 2Department of Physics, University of Fribourg, CH-1700 Fribourg, Switzerland — 3Institut Jean Lamour, CNRS-Université de Lorraine
Excitons (coupled electron-hole pairs) in semiconductors can form collective states that exhibit spectacular nonlinear properties and possible applications in future optoelectronic devices. We present here some theoretical methods and a workflow for determining the excitonic wave functions and the corresponding excitonic binding energies for bulk Black Phosphorus. We solve the Bethe-Salpeter equations for coherent and incoherent excitations. The theoretical/numerical results are compared to the experimental ones of angle resolved photoemission spectroscopy (ARPES), by analyzing the spectra produced after including non-equilibrium electron-phonon dynamics; solving the time-dependent Boltzmann equation. These results allow us to understand the nature and characteristics of these two-particle bound states, together with some scattering effects, being challenging due to the stronger screened potential for 3D materials, resulting in short time excitations.
Keywords: Excitons; angle resolved photoemission spectroscopy (ARPES); non-equilibrium electron-phonon dynamics; 3D materials