Electric-field control of exciton fine structure: atomic scale   manipulation of exchange splitting
  We use atomistic tight-binding theory with a configuration interaction description of Coulomb and exchange effects to describe excitons in symmetric quantum dots in a vertical electric field. We show that field-induced manipulation of exciton orientation and phase produces a drastic reduction of fine structure splitting, an anticrossing, and a 90 degree rotation of polarization, similar to experiment. An atomistic analysis is needed to explain how exciton reorientation modifies anisotropic exchange and fine structure splitting without significantly altering other splittings. 
Garnett W. Bryant, Natalia Malkova, and James Sims
cond-mat.mes-hall cond-mat.mtrl-sci quant-ph