title: Two-dimensional electron-hole liquid in single Si quantum wells with large electronic and dielectric confinement.
abstract: We report a luminescence study of the electronic properties of the 2D electron-hole liquid in crystalline Si quantum wells with SiO2 dielectric barriers. The Fermi-Dirac condensation of e-h pairs into a metallic liquid is strongly enhanced by spatial localization. We present experimental evidence for the formation of liquid nanodroplets, with size increasing with e-h pair density. The quantum confined regime is observed for well width below 15 nm. The data are analyzed in a confinement model that takes account of the band-gap renormalization by 2D many-body effects and the increase of the Coulomb interactions due to the dielectric mismatch between the Si well and the SiO2 barriers.
authors.affiliation: DRFMC/SP2M, CEA-Grenoble, 17 Avenue des Martyrs, 38054 Grenoble Cedex 9, France. pauc@drfmc.ceng.cea.fr
authors.forename: N
authors.initials: N
authors.lastname: Pauc
authors.forename: V
authors.initials: V
authors.lastname: Calvo
authors.forename: J
authors.initials: J
authors.lastname: Eymery
authors.forename: F
authors.initials: F
authors.lastname: Fournel
authors.forename: N
authors.initials: N
authors.lastname: Magnea