EventDetails

Speaker:
Dr. Christoph Gadermaier, Jozef Stefan Institute, Ljubljana, Slovenia

Two-dimensional semiconductors combine easy fabrication and mechanical
flexibility with particularly strong light-matter interaction. I will discuss the
relaxation dynamics of photoexcited electrons in MoS2 and WS2, with
particular emphasis on the formation of excitons and free carriers, as well as
the strong optical signatures of many-body effects. Moreover, we observed a
particularly strong electroabsorption in MoS2. Contrary to known variants of
the Stark effect, the absorption broadening increases linearly with the applied
field. The achievable modulation depths bear the scope for extremely compact
energy-efficient electroabsorption modulators for integrated photonics.