Seminar of Department of Experimental Physics - František Herman (15.3.2021)
Monday 15.3.2021 at 15:00 online
Mgr. František Herman, PhD.:
Large twisting angles in bilayer graphene moiré quantum dot structures
Abstract:
Recent exploration of the commensurate structure in turbostratic double-layer graphene shows that large-angle twisting can be treated by the decrease of the effective velocity within the energy spectra of single-layer graphene. Within our work, we use this result as a starting point, aiming towards understanding the physics of large-angle twisted double-layer graphene (i.e., moiré) quantum dot systems. We show that within this simple approach, using the language of the first quantization, an unrealized (to our knowledge), illustrative property of the commutation relation appears in graphene physics. Intriguingly, large twisting angles are shown to be suitable for tuning the position symmetry in graphene systems. We would also like to sketch our present work, as well as the role of the exciton states in graphene quantum dots.