title: Nature of tunable hole g factors in quantum dots.
abstract: We report an electric-field-induced giant modulation of the hole g factor in SiGe nanocrystals. The observed effect is ascribed to a so-far overlooked contribution to the g factor that stems from the mixing between heavy- and light-hole wave functions. We show that the relative displacement between the confined heavy- and light-hole states, occurring upon application of the electric field, alters their mixing strength leading to a strong nonmonotonic modulation of the g factor.
authors.affiliation: SPSMS, CEA-INAC/UJF-Grenoble 1, 17 Rue des Martyrs, F-38054 Grenoble Cedex 9, France.
authors.forename: N
authors.initials: N
authors.lastname: Ares
authors.affiliation: SPSMS, CEA-INAC/UJF-Grenoble 1, 17 Rue des Martyrs, F-38054 Grenoble Cedex 9, France and Institute for Integrative Nanosciences, IFW Dresden, Helmholtzstrasse 20, D-01069 Dresden, Germany and IKERBASQUE, Basque Foundation for Science, E-48011 Bilbao, Spain and Centro de Física de Materiales (CFM-MPC), Centro Mixto CSIC-UPV/EHU, Manuel de Lardizabal 5, E-20018 San Sebastián, Spain.
authors.forename: V N
authors.initials: VN
authors.lastname: Golovach
authors.affiliation: SPSMS, CEA-INAC/UJF-Grenoble 1, 17 Rue des Martyrs, F-38054 Grenoble Cedex 9, France and Institute for Integrative Nanosciences, IFW Dresden, Helmholtzstrasse 20, D-01069 Dresden, Germany and Johannes Kepler University, Institute of Semiconductor and Solid State Physics, Altenbergerstrasse 69, 4040 Linz, Austria.
authors.forename: G
authors.initials: G
authors.lastname: Katsaros
authors.affiliation: Université de Lorraine, Institut Jean Lamour, UMR CNRS 7198, Nancy-Université, BP 239, F-54506 Vandoeuvre-les-Nancy, France.
authors.forename: M
authors.initials: M
authors.lastname: Stoffel
authors.affiliation: CEA, LETI, MINATEC, 17 Rue des Martyrs, F-38054 Grenoble Cedex 9, France.
authors.forename: F
authors.initials: F
authors.lastname: Fournel
authors.affiliation: Department of Physics, Yale University, New Haven, Connecticut 06520, USA.
authors.forename: L I
authors.initials: LI
authors.lastname: Glazman
authors.affiliation: Institute for Integrative Nanosciences, IFW Dresden, Helmholtzstrasse 20, D-01069 Dresden, Germany.
authors.forename: O G
authors.initials: OG
authors.lastname: Schmidt
authors.affiliation: SPSMS, CEA-INAC/UJF-Grenoble 1, 17 Rue des Martyrs, F-38054 Grenoble Cedex 9, France.
authors.forename: S
authors.initials: S
authors.lastname: De Franceschi