Technical University Munich
Department of Physics
Tel. +49 89 289 12840
Research focus: attosecond physics, ultrafast quantum dynamics, laser spectroscopy
Our group's activities aim at investigating processes inside atoms, molecules and solids on the shortest timescale reached so far, the attosecond timescale. New insight into ever smaller microscopic units of matter as well as in ever faster evolving chemical, physical or atomic processes pushes the frontiers in many fields in science. The interest in these ultrashort processes is the driving force behind the development of sources and measurement techniques that allow time-resolved studies at ever shorter timescales.
Ultrafast laser spectroscopy of quantum dynamics
In general, the experimental tools used in the group are pump/probe techniques in various constellations (e.g. 2-color) measured with time resolved spectroscopic tools (absorption spectroscopy, photoelectron and ion spectroscopy). Many different sources are being used and developed ranging from the infrared (optical parametric amplification techniques, OPA) to visible (chirped pulse amplification techniques, CPA) , ultraviolet (nonlinear optics, NLO), extreme ultraviolet (high-order harmonic generation, HHG) [1,2] to x-rays (free electron lasers, FEL) .
The goal of this research group is to use femtosecond and attosecond technology and methods to resolve ultrafast processes in condensed matter sciences by providing direct access to the motion of electrons in molecular and solid state systems.
Efforts are undertaken to control and measure the attosecond-scale charge hopping that takes place by the movement of bound electrons between the nuclei of simple molecules. In these complex systems a charge transfer may solely be driven by electron correlation.
Of special interest are electronic transport and bandstructure effects in solids [5-7] and nanostructured systems , electronic correlation  and dephasing.
The research is conducted at the chair of Laser and X-Ray Physics (E11) at the Physics Department of TUM, at the Max-Planck-Insitute of Quantum Optics (Max-Planck-Fellow) and at beamtimes at large scale facilities (eg. LCLS at Stanford Linear Accelerator Center).
1. R. Kienberger et al., Science, 297 (2002)
2. R. Kienberger, et al., Nature, 427(2004)
3. T. Wittmann et al., Nature Physics 5 (2009)
4. W. Helml et al., Nature Photonics 8 (2014)
5. A. Schiffrin et al., Nature 507 (2014)
6. Sommer et al., Nature 534 (2016)
7. M.S. Wagner, et al., Phys. Chem. Chem. Phys. 17 (2015)
8. S. Neppl et al., Nature 517 (2015)
9. M. Ossiander et al., Nature Physics 13 (2016)