Graphene age

In the past 20 years, we have gone through the copper age and iron age, both in superconductivity, weighing in strongly correlated systems. Some people might even have an impression that, few new physics can be found outside the U-regime. U is the Hubbard repulsion. But imagination leads us beyond that sight: we have found surprises and fostered new cherished babies in the usual band theory. We now are digging in the topological insulators and graphene, which are constantly offering exotic and practically important physics. The lesson here is: imagination is more important than knowledge ! (Einstein)