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Ultrafast spectroscopy on semiconductors involving THz pulses

Photo by Prof. Martin Koch

 Foto of the relay laboratory

The research group examines ultra-fast processes in semiconductors, which take place after optical excitation, with very short laser pulses. Of special interest are excitonic transitions. Low-intensity THz-pulses are also used to study the creation dynamics of excitons and intra-excitonic transitions. Additionally, strong THz-pulses are used to disturb and manipulate dynamic processes in semiconductors.

B. Ewers et al., Ionization of coherent excitons by strong terahertz fields, Phys. Rev. B 85, 075307 (2012) [doi].

M.J. Drexler et al, Disturbing the Coherent Dynamics of an Excitonic Polarisation with strong THz fields, Phys. Rev. B 90, 195304 (2014) [Doi].