Strong exciton binding in quantum structures through remote dielectric   confinement
  We propose a new type of hybrid systems formed by conventional semiconductor nanostructures with the addition of remote insulating layers, where the electron-hole interaction is enhanced by combining quantum and dielectric confinement over different length scales. Due to the polarization charges induced by the dielectric mismatch at the semiconductor/insulator interfaces, we show that the exciton binding energy can be more than doubled. For conventional III-V quantum wires such remote dielectric confinement allows exciton binding at room temperature. 
G. Goldoni, F. Rossi, E. Molinari (INFM and Dipartimento di Fisica,   Univ. of Modena, Italy)