Possible Ordered States in Graphene Systems

Graphene is a two dimensional honeycomb lattice of
carbon atoms which has recently attracted
considerable attention because of rapid experimental
progress, and because of its novel physical
properties. In this work, we will discuss recent
theoretical work in which we have proposed new types
of ordered electronic states in graphene systems,
including pseudospin magnets which show spontaneous
charge transfer between two layers, and excitonic
superfluids which could have remarkably high
transition temperatures. This work will conclude
with some speculations on the possibility of
radically new types of electronic devices in
these systems whose operation is based on collective
electronic behavior.