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Experimentalphysik II

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Jessica Mämpel


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Ihre Position



The department’s research focus lies in the field of ultrafast phenomena in advanced solids, ranging from metals, metallic nanostructures, organic and anorganic semiconductors, with emphasis on photovoltaic applications, to correlated electron systems. In many of these solid state systems the material’s functional properties are being controlled by the particularities of the interaction/interplay between the different subsystems (electrons, spin, crystal lattice). To study and understand these interactions the time-resolved techniques, which were (and are being) developed in the last decades, could make a decisive contribution. Here a femtosecond pulse is used to drive the system out of equilibrium, while the suitably delayed light (from Terahertz to X-ray range) or electron pulse is used to track the relaxation back to equilibrium. Thereby different excitations can be tracked in real-time clarifying their role in the functional properties of the material/system under scrutiny. Importantly, experiments can be performed both in the low perturbation limit, where the system is close to thermal equilibrium, as well as in the strong excitation regime. In the latter case various phase transition can be optically driven, enabling both new insights into these materials as well as external control of their functional properties.

In the department several experimental techniques are being developed, optimized and utilized, ranging from time-resolved THz spectroscopy, enabling access to low energy excitations, to femtosecond electron diffraction, where atomic motion is investigated on the femtosecond timescale.

Research Topics

  • Ultrafast phenomena in advanced solids
  • Light-matter interactions
  • Femtosecond electron diffraction
  • Linear and time-resolved terahertz and optical spectroscopy
  • Correlated electron systems