Stirring Potential for Indirect Excitons
  We demonstrate experimental proof of principle for a stirring potential for indirect excitons. The azimuthal wavelength of this stirring potential is set by the electrode periodicity, the amplitude is controlled by the applied AC voltage, and the angular velocity is controlled by the AC frequency. 
M.W. Hasling, Y.Y. Kuznetsova, P. Andreakou, J.R. Leonard, E.V.   Calman, C. Dorow, L.V. Butov, M. Hanson, and A.C. Gossard
cond-mat.mes-hall