Event calendar file
Theoretical Physics Colloquium
Why does Graphene Behave as a Weakly Interacting System?
by Prof. Sankar Das Sarma (University of Maryland)
Tuesday, July 14, 2015
from
to
(Asia/Kolkata)
at TIFR Colaba Campus ( AG69 )
at TIFR Colaba Campus ( AG69 )
| Description |
Graphene is a rather interesting two-dimensional condensed matter field theoretic version of 2+1-dimensional quantum electrodynamics with the coupling constant (i.e. the effective graphene fine-structure constant) being around 2 rather than 1/137. Nevertheless, graphene seems to behave as a weak-coupling interacting system from the experimental perspective. Why? I will describe our systematic efforts [1-3] in trying to solve this fundamental mystery. I will discuss both theory and experiment in this particular context. If time permits, I will also discuss recent developments in the corresponding three-dimensional Dirac materials [4-5] which are condensed matter analogs of 3+1 dimensional QED. [1] S. Das Sarma and E.H. Hwang, Phys. Rev. B 87, 045425 (2013) [2] E. Barnes et al., Phys. Rev. B 89, 235431 (2014) [3] J. Hofmann et al., Phys. Rev. Lett. 113, 105502 (2014) [4] J. Hofmann and S. Das Sarma, Phys. Rev. B 91, 241108 (2015) [5] R. Throckmorton, J. Hofmann, E. Barnes, and S. Das Sarma, arXiv:1505.05154 |
