Electron-hole localization in coupled quantum dots
  We theoretically investigate correlated electron-hole states in vertically coupled quantum dots. Employing a prototypical double-dot confinement and a configuration-interaction description for the electron-hole states, it is shown that the few-particle ground state undergoes transitions between different quantum states as a function of the interdot distance, resulting in unexpected spatial correlations among carriers and in electron-hole localization. Such transitions provide a direct manifestations of inter- and intradot correlations, which can be directly monitored in experiments. 
Filippo Troiani (1), Ulrich Hohenester (1 and 2), Elisa Molinari (1)   ((1) INFM and Dipartimento di Fisica, Universita` deg...