A geometrical crossover in excited states of two-electron quantum dots   in a magnetic field
  We use the entanglement measure to study the evolution of quantum correlations in two-electron axially-symmetric parabolic quantum dots under a perpendicular magnetic field. We found that the entanglement indicates on the shape transition in the density distribution of two electrons in the lowest state with zero angular momentum projection at the specific value of the applied magnetic field. 
R. G. Nazmitdinov, N. S. Simonovic, A. R. Plastino, A. V. Chizhov
cond-mat.mes-hall quant-ph