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Ultrafast carrier and spin dynamics in two-dimensional semiconductors

Date Fr, 12.06.2020 - Fr, 12.06.2020
Time 15:00h
Speaker Prof. Giulio Cerullo, Politecnico di Milano (Italy)
Location online: https://epfl.zoom.us/j/99858692475
Program Layered materials are solids consisting of crystalline sheets with strong in-plane covalent bonds and weak van der Waals out-of-plane interactions. These materials can be easily exfoliated to a single layer (1L), obtaining two-dimensional (2D) materials with radically novel physico-chemical characteristics compared to their bulk counterparts. The field of 2D materials began with graphene and quickly expanded to include semiconducting transition metal dichalcogenides (TMDs). 2D materials exhibit very strong light-matter interaction and exceptionally intense nonlinear optical response, enabling a variety of novel applications in optoelectronics and photonics. This talk will review our studies on the non-equilibrium and nonlinear optical response of 2D materials. We will discuss ultrafast carrier and spin dynamics in 2D semiconductors and their heterostructures. We will also show gate-tunable absorption saturation and third-harmonic generation in 1L-graphene and optical parametric amplification in 1L-TMDs.
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