title: Quantitative strain analysis of InAs/GaAs quantum dot materials.
abstract: Geometric phase analysis has been applied to high resolution aberration corrected (scanning) transmission electron microscopy images of InAs/GaAs quantum dot (QD) materials. We show quantitatively how the lattice mismatch induced strain varies on the atomic scale and tetragonally distorts the lattice in a wide region that extends several nm into the GaAs spacer layer below and above the QDs. Finally, we show how V-shaped dislocations originating at the QD/GaAs interface efficiently remove most of the lattice mismatch induced tetragonal distortions in and around the QD.
authors.affiliation: Materials and Chemistry, SINTEF, NO-7465 Trondheim, Norway.|Department of Physics, Norwegian University of Science and Technology- NTNU, NO-7491 Trondheim, Norway.
authors.forename: Per Erik
authors.initials: PE
authors.lastname: Vullum
authors.affiliation: Department of Physics, Norwegian University of Science and Technology- NTNU, NO-7491 Trondheim, Norway.
authors.forename: Magnus
authors.initials: M
authors.lastname: Nord
authors.affiliation: Department of Physics, Norwegian University of Science and Technology- NTNU, NO-7491 Trondheim, Norway.
authors.forename: Maryam
authors.initials: M
authors.lastname: Vatanparast
authors.affiliation: Department of Physics, Norwegian University of Science and Technology- NTNU, NO-7491 Trondheim, Norway.
authors.forename: Sedsel Fretheim
authors.initials: SF
authors.lastname: Thomassen
authors.affiliation: Nanyang Technological University, School of Materials Science and Engineering, 50 Nanyang Avenue, 639798, Singapore.
authors.forename: Chris
authors.initials: C
authors.lastname: Boothroyd
authors.affiliation: Department of Physics, Norwegian University of Science and Technology- NTNU, NO-7491 Trondheim, Norway.
authors.forename: Randi
authors.initials: R
authors.lastname: Holmestad
authors.affiliation: Department of Electronic Systems, Norwegian University of Science and Technology- NTNU, NO-7491 Trondheim, Norway.
authors.forename: Bjørn-Ove
authors.initials: BO
authors.lastname: Fimland
authors.affiliation: Department of Physics, Norwegian University of Science and Technology- NTNU, NO-7491 Trondheim, Norway.
authors.forename: Turid Worren
authors.initials: TW
authors.lastname: Reenaas