title: Fabrication and Optical Properties of Strain-free Self-assembled Mesoscopic GaAs Structures.
abstract: We use a combined process of Ga-assisted deoxidation and local droplet etching to fabricate unstrained mesoscopic GaAs/AlGaAs structures exhibiting a high shape anisotropy with a length up to 1.2 μm and a width of 150 nm. We demonstrate good controllability over size and morphology of the mesoscopic structures by tuning the growth parameters. Our growth method yields structures, which are coupled to a surrounding quantum well and present unique optical emission features. Microscopic and optical analysis of single structures allows us to demonstrate that single structure emission originates from two different confinement regions, which are spectrally separated and show sharp excitonic lines. Photoluminescence is detected up to room temperature making the structures the ideal candidates for strain-free light emitting/detecting devices.
authors.affiliation: Laboratório Nacional de Nanotecnologia (LNNano/CNPEM), 13083-100, Campinas, SP, Brazil.|Departamento de Física, Universidade Federal de Viçosa, 36570-900, Viçosa, MG, Brazil.
authors.forename: Saimon Filipe Covre
authors.initials: SFC
authors.lastname: da Silva
authors.affiliation: Laboratório Nacional de Nanotecnologia (LNNano/CNPEM), 13083-100, Campinas, SP, Brazil.|Universidade Federal de Itajubá, Campus Itabira, 35903-087, Itabira, MG, Brazil.
authors.forename: Thayná
authors.initials: T
authors.lastname: Mardegan
authors.affiliation: Laboratório Nacional de Nanotecnologia (LNNano/CNPEM), 13083-100, Campinas, SP, Brazil.
authors.forename: Sidnei Ramis
authors.initials: SR
authors.lastname: de Araújo
authors.affiliation: Laboratório Nacional de Nanotecnologia (LNNano/CNPEM), 13083-100, Campinas, SP, Brazil.
authors.forename: Carlos Alberto Ospina
authors.initials: CAO
authors.lastname: Ramirez
authors.affiliation: Department of Electrical and Computer Engineering, Faculty of Engineering, Naresuan University, Phitsanulok, 65000, Thailand.
authors.forename: Suwit
authors.initials: S
authors.lastname: Kiravittaya
authors.affiliation: Instituto de Física "Gleb Wataghin", Universidade Estadual de Campinas, 13083-859, Campinas, SP, Brazil.
authors.forename: Odilon D D
authors.initials: ODD
authors.lastname: Couto
authors.affiliation: Instituto de Física "Gleb Wataghin", Universidade Estadual de Campinas, 13083-859, Campinas, SP, Brazil.
authors.forename: Fernando
authors.initials: F
authors.lastname: Iikawa
authors.affiliation: Laboratório Nacional de Nanotecnologia (LNNano/CNPEM), 13083-100, Campinas, SP, Brazil. christoph.deneke@lnnano.cnpem.br.
authors.forename: Christoph
authors.identifier: http://orcid.org/0000-0002-8556-386X
authors.initials: C
authors.lastname: Deneke
keywords: Ga-assisted deoxidation; Local hole etching; Molecular beam epitaxy; Strain-free quantum dots