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O: Fachverband Oberflächenphysik

O 107: Semiconductor Surfaces (joint session O/HL)

O 107.8: Vortrag

Donnerstag, 19. März 2020, 17:00–17:15, REC C 213

Selective Excitation of Amplitude Modes Driving the In/Si(111) Peierls Transition — •Hannes Böckmann-Clemens, Jan Gerrit Horstmann, and Claus Ropers — 4th Physical Institute, Solids and Nanostructures, University of Göttingen, Göttingen 37077,Germany

The use of laser pulses to actively steer a system along the transition pathway from a reactant towards a desired product state is a fundamental scheme in the field of femtochemistry. Transferring this concept to solid-state surface systems requires the ultrafast manipulation of coherent phonons, associated with the reaction coordinate. Here, we demonstrate the mode-selective vibrational control over the Peierls metal-to-insulator phase transition of In/Si(111) by means of tailored pulse sequences. We explore the potential energy surface spanned by the amplitude modes of the system via selection of specific pathways along the transition path. We identify two essential modes, identify their separate roles in controlling the transition, and carry out experiments with mode-selective excitation.