Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 66: Ultrafast Dynamics of Light-Driven Systems

TT 66.10: Vortrag

Freitag, 5. April 2019, 12:15–12:30, H2

Ultrafast spin dynamics and high-harmonic generation in multilayer systems based on graphene — •Dominik Schulze and Jamal Berakdar — Institute for physics, Martin-Luther-University Halle-Wittenberg, 06120 Halle (Saale), Germany

High harmonic generation in solids is attracting considerable research due to prospect application in solid-state based emitting devices and ultrafast optoelectronics.

Our research interest is devoted to the role of spin and its exploitation in ultrafast spintronics. In this talk, we present our research on high-harmonic generation in spin-orbital coupled systems such as multilayer systems based on graphene.

The goal is twofold: 1) to utilize these systems as a local radiation source, and 2) to analyze the emitted, time-dependent spectra that may carry footprints of internal spin-dependent mechanism that are important for the operation of spintronic devices.

We present results on multilayer systems composed of graphene on a substrate which induces a strong spin-orbit coupling into the graphene layer. This leads to various interesting effects resulting from the sublattice potential, the Rashba type spin-orbit coupling and a time-reversal symmetry breaking. Full-fledge calculations show how the gap opening at the K and K' points of the graphene affects the high harmonic generation of inter band excitations.