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O: Fachverband Oberflächenphysik
O 19: 2D Materials II: Electronic Structure, Excitations, etc. (joint session O/CPP/HL)
O 19.9: Vortrag
Montag, 16. März 2020, 17:15–17:30, WIL C107
Tailoring the opto-electronic response of graphene nanoflakes by size and shape optimization — •Raquel Esteban-Puyuelo1, Rajat Sonkar2, Bhalchandra Pujari2, Oscar Grånäs1, and Biplab Sanyal1 — 1Division of Materials Theory, Department of Physics and Astronomy, Uppsala University, Box-516, SE 75120, Sweden — 2Centre for Modeling and Simulation, Savitribai Phule Pune University, Ganeshkhind, Pune 411007, India
The long spin-diffusion length, spin-lifetime and excellent optical absorption coefficient of graphene provide a promising platform for building opto-electronic devices as well as spin-based logic in the nanometer regime. We have used time-dependent density functional theory to study how the magnetic structure and optical properties of graphene nanoflakes depend on their size and shape. We optimize the magnetic ground state and the exchange coupling between the edges of the flakes to tailor the external fields needed to switch the magnetic ordering. Finally it's shown that the magnetic state alters the optical response of the flake leading to the possibility of opto-spintronic applications.