Fri, 24.01.2020  |  10:30 AM - 11:30 AM
Semianr room B, 2.6
Seminars Seminar T: Strong Field Theory, Theoretical Optics & Photonics, Biomolecular Dynamics

Title: Ultrafast kinetics in two-dimensional crystals: topological phenomena

Hamed Koochaki Kelardeh, postdoc | Max Planck Institute for the Physics of Complex Systems (MPI-PKS)

talks about

I will talk about the interaction of an ultrafast and strong optical field with two-dimensional materials, in particular, honeycomb-shaped nanostructures such as graphene. Major emphasis is given on the topological aspects, namely the Pancharatnam-Berry phase and chirality of the Dirac cones. Taking double-cycle circularly polarized pulse, we display the attosecond self-referenced interferogram in graphene where the dynamic and topological phases signify their roles.

Besides, I will conjecture a proposal for making an ultrafast switch with graphene that acts on a femtosecond time scale and can controllably modulate the transient- induced photocurrent and carrier transport.

Further, I will discuss the possibility of exploiting the valley degree of freedom in graphene and gapped graphene and the manifestation of quantum valley Hall effects within it and other Dirac materials.