Physics Colloquium: Dr. Pouyan Ghaemi, University of Illinois.
Wed, Feb 13
4:00 PM — 5:00 PM
Marshak160 Convent Avenue
"Graphene: The elastic playground of novel electronic phases and quantum excitations"Abstract:
The discovery of massless Dirac fermions in graphene has generated a new area of science and technology in condensed matter systems where it is possible to observe and control charge carriers which behave relativistically. In comparison to other materials with relativistic band structure, graphene is truly two dimensional and this distinguishes it as the most tunable condensed matter system with Dirac band structure. In particular, recent experiments have shown strong interplay between lattice deformations of graphene and its electronic band structure. For example strain in graphene affects its electrons in a manner similar to applying a strong magnetic field, causing the formation of flat Landau levels. In this talk I will discuss the electronic properties of strained graphene and show that in this system, electron-electron interactions can lead to novel electronic phases, such as fractional topological states with preserved time reversal symmetry. These results show that graphene is a promising venue for experimental observation of many novel states of matter.