title: Quantum confinement-controlled exchange coupling in manganese(II)-doped CdSe two-dimensional quantum well nanoribbons.
abstract: The impact of quantum confinement on the exchange interaction between charge carriers and magnetic dopants in semiconductor nanomaterials has been controversially discussed for more than a decade. We developed manganese-doped CdSe quantum well nanoribbons with a strong quantum confinement perpendicular to the c-axis, showing distinct heavy hole and light hole resonances up to 300 K. This allows a separate study of the s-d and the p-d exchange interactions all the way up to room temperature. Taking into account the optical selection rules and the statistical distribution of the nanoribbons orientation on the substrate, a remarkable change in particular of the s-d exchange constant with respect to bulk is indicated. Room-temperature studies revealed an unusually high effective g-factor up to ~13 encouraging the implementation of the DMS quantum well nanoribbons for (room temperature) spintronic applications.
authors.affiliation: Werkstoffe der Elektrotechnik and CeNIDE, Universität Duisburg-Essen, Bismarckstrasse 81, 47057 Duisburg, Germany. rachel.fainblat-padua@uni-due.de
authors.forename: Rachel
authors.initials: R
authors.lastname: Fainblat
authors.forename: Julia
authors.initials: J
authors.lastname: Frohleiks
authors.forename: Franziska
authors.initials: F
authors.lastname: Muckel
authors.forename: Jung Ho
authors.initials: JH
authors.lastname: Yu
authors.forename: Jiwoong
authors.initials: J
authors.lastname: Yang
authors.forename: Taeghwan
authors.initials: T
authors.lastname: Hyeon
authors.forename: Gerd
authors.initials: G
authors.lastname: Bacher