Dresden 2014 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 63: Posters: Scanning Probe Methods

O 63.7: Poster

Mittwoch, 2. April 2014, 17:30–21:00, P2

Proposal for tracing the local ionization dynamics of adsorbed molecules by photo-assisted scanning tunneling microscopy — •Michael Schüler and Jamal Berakdar — Martin-Luther University Halle-Wittenberg, Institute for Physics, Karl-Heinrich-von-Fritsch-Straße 3, 06120 Halle, Germany

For tracing the spatiotemporal evolution of electronic systems we suggest and analyze theoretically a setup that exploits the excellent spatial resolution based on scanning tunneling microscopy techniques combined with the temporal resolution of femtosecond pump-probe photoelectron spectroscopy. As an example we consider the laser-induced, local vibrational dynamics of a surface-adsorbed molecule. The photoelectrons released by a laser pulse can be collected by the scanning tip and utilized to access the spatio-temporal dynamics. Our proof-of- principle calculations are based on the solution of the time-dependent Schrödinger equation supported by the ab initio computation of the matrix elements determining the dynamics.