Monday, January 11, 2010
Recent CMU PhD Graduate Vladimir Stojanovic's Paper Selected as Editors' Suggestion
A recent paper entitled "Electron-phonon coupling in graphene antidot lattices: An indication of polaronic behavior", by Vladimir Stojanovic, Mihajlo Vanevic, and Nenad Vukmirovic in Physical Review B 81, 041408(R) (2010), has been selected as an Editors' Suggestion. Vladimir Stojanovic is a graduate of the CMU Physics Department, receiving his Ph.D. in 2008, and is now a postdoc at the University of Basel in Switzerland. As a service to both readers and authors, Editors' Suggestions are a small number of papers published in Physical Review B that the editors and referees find of particular interest, importance, or clarity.
Summary of the paper:
Nano-engineered arrays of voids in a graphene sheet -- graphene antidot lattices -- have recently ignited considerable interest as a viable route towards creating an electronic band gap in graphene. This synthetic material, a semiconducting counterpart of graphene, holds promise as a platform of a post-silicon electronics. While it has been widely accepted by now that the lattice vibrations in graphene itself have a comparatively small influence on the charge transport, in this work we show that the situation in graphene-based antidot lattices is quite different. Based on a theoretical model for the interaction between the pi-orbital electrons and the quanta of the lattice vibrations (phonons), we make the case that the charge carriers in graphene antidot lattices are not just the "bare" electrons, but the "heavy" ones (polarons), strongly coupled with the surrounding lattice distortions. Our study provides an insight into the physics of this nano-fabricated metamaterial which is likely to guide the design of future electronic devices.