Neutral magic-angle bilayer graphene: Condon instability and chiral resonances
Dionisios Margetis (IPST/Mathematics), with collaborators in Spain and Germany, published a paper titled "Neutral magic-angle bilayer graphene: Condon instability and chiral resonances" in Small Science on April 12. The publication appeared in a multidisciplinary journal dedicated to publishing highly impactful research in nanoscience and nanotechnology.
The authors investigated the full optical response of magic angle graphene at the neutrality point consisting of the total, magnetic, and chiral response. The dissipative response was obtained without the usual damping term by analytically integrating the delta-function on a linearized grid. The reactive response was then obtained via the Kramers–Kronig relation applying a suitable cutoff for large frequencies. By this, the authors obtained accurate results close to the magic angle even for low energies.