Excitons and biexcitons are related to Chern-Simons Theory. 
Macroscopically ordered (Bose Einstein)exciton states exist in gallium arsenide and aluminum gallium arsenide.
Vortex Splitting* Excitons can be created by the absorption of a photon.
* Excitons can bond with pairs of vortices in a transverse magnetic field.
* Excitons interact with phonons.
* There are three dark and one light exitron in carbon nanotubes.
* By changing the transverse magnetic field on a two dimensional system, you change the filling factor. The filling factor is the ratio of particle density to vortex density. By changing the filling factor across the critical filling values of one half or one third, you can induce the corresponding phase changes. Think of all the devices you could make with a little graphene! What is even more exciting is bilayer graphene.
Tower of Bable:
Vortex = Quantum of Flux
Valley = Pseudospin
I use the words beginning with "V" unless I am playing Scrabble.
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