Two-Dimensional Electrostatic Lattices for Indirect Excitons
  We report on a method for the realization of two-dimensional electrostatic lattices for excitons using patterned interdigitated electrodes. Lattice structure is set by the electrode pattern and depth of the lattice potential is controlled by applied voltages. We demonstrate square, hexagonal, and honeycomb lattices created by this method. 
Mikas Remeika, Michael M. Fogler, Leonid V. Butov, Micah Hanson,   Arthur C. Gossard
cond-mat.mes-hall