Department of Spectroscopy (FWIH)

The Spectroscopy Department deals with the optical investigation of novel materials in the visible, infrared and terahertz range for the investigation of charge carrier dynamics on a femtosecond or picosecond timescale. Specifically, the materials studied are low-dimensional semiconductor structures: quantum wells, heterostructures, superlattices, quantum dots and wires, graphene and other two-dimensional semiconductors (transition metal dichalcogenide monolayers), and topological insulators.

Research Topics

Characterization methods

Time-resolved optical experiments are performed with table-top femtosecond lasers (Ti:sapphire oscillators, amplifiers, OPG/OPA, THz emitters) and with the free-electron laser at ELBE. The latter offers unique possibilities for time-resolved spectroscopy in the mid- and far-infrared regimes, in particular for investigations on semiconductors and their nanostructures. Synchronization of table-top femtosecond lasers to the free-electron laser is also possible (e. g, for two-color experiments). The department is also involved in the application of these measurement techniques at the Dresden High Magnetic Field Laboratory.