Freiburg 2024 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 38: Poster IV

Q 38.44: Poster

Wednesday, March 13, 2024, 17:00–19:00, KG I Foyer

Optimal valley control in 2D materials with subcycle laser pulses — •Arkajyoti Maity, Ulf Saalmann, and Jan-Michael Rost — Max Planck Institute for the Physics of Complex Systems, Nöthnitzer Straße 38,01187 Dresden

Information processing, using the valley degrees of freedom in inversion symmetric 2D materials is possible with the help of specifically designed ultrafast laser pulses. In our work, we theoretically show how linearly polarized terahertz subcycle laser pulses allow us to obtain a saturation of valley polarization (VP) in monolayer graphene . We further exploit the matching of the Thz drive time scales with dephasing rates in the material to get amplitude-controlled valley-polarized responses, namely residual photocurrents. We also present some results on pulse-shaping, both in spectral-phase and polarization domain, for efficient VP.

Keywords: Graphene; Valley polarization; Ultrafast, Ultrashort; Information Processing; Quantum Physics