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HL: Fachverband Halbleiterphysik

HL 76: Poster IIIC

HL 76.20: Poster

Donnerstag, 19. März 2020, 15:00–17:30, P2/4OG

Coupling dynamics of coherent acoustic phonons in a Graphite−MoS₂ heterostructure observed by ultrafast electron diffraction — •Arne Ungeheuer, Ahmed Hassanien, Arne Senftleben, Mashood Mir, and Thomas Baumert — University of Kassel, Institute of Physics and Center for Interdisciplinary Nanostructure Science and Technology (CINSaT), D-34132 Kassel, Germany

We investigate the coupling dynamics of coherent acoustic phonons in a Graphite−MoS₂ heterostructure, excited with a femtosecond laser pulse. Since the MoS₂ layer is transparent at our excitation wavelength of 785 nm, the coherent acoustic phonons are first excited exclusively in the Graphite layer. The subsequent coupling dynamics between the two materials are then probed with an ultrashort electron pulse imaging the transient by varying the delay time between pump- and probe-pulse. Furthermore we aim to coherently control these dynamics by using a double-pulse sequence for excitation. Amplification or annihilation of the coherent acoustic phonons in the Graphite layer can be achieved by adjusting the time-delay between the two excitation pulses.