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Chemical and structural effects of two-dimensional isovalent substitutions in A(III)-B(V) semiconductors
The empirical pseudopotential method is used to study the electronic properties of two-dimensional isovalent substitutions in A(III)-B(V) semiconductors in a periodic modelling approach. Namely, for InAs/GaAs,...
PublicationsThermally assisted tunneling processes in InxGa1-xAs/GaAs quantum-dot structures
An ensemble of self-assembled InxGa1−xAs quantum dots has been grown in n-conducting GaAs with a low dislocation density by molecular beam epitaxy using the so-called activated alloy phase separation...
PublicationsMagneto-optical coupling in ferromagnetic thin films investigated by vector-magneto-optical generalized ellipsometry
We performed generalized Mueller matrix ellipsometry measurements in a magnetic field of arbitrary orientation and magnitude up to 400 mT at room temperature and probed the magneto-optical response of...
PublicationsMnSi1.7 nanoparticles embedded in Si: Superparamagnetism with collective behavior
The doping of Mn in Si is attracting research attentions due to the possibility to fabricate Si-based diluted magnetic semiconductors. However, the low solubility of Mn in Si favors the precipitation of...
PublicationsApplication of pulsed laser annealing to ferromagnetic GaMnAs
In this experimental and theoretical work we focus on the technique of pulsed laser annealing applied to the metastable ferromagnetic semiconductor GaMnAs. Analytical heat-flow calculations are used to...
PublicationsAbsence of ferromagnetic-transport signatures in epitaxial paramagnetic and superparamagnetic Zn0.95Co0.05O films
Paramagnetic (PM) and superparamagnetic (SPM) Zn0.95Co0.05O epitaxial films display similar temperature and magnetic field dependent anisotropic magnetoresistance (MR) effects. The high structural quality...
PublicationsHysteresis in the magnetotransport of manganese-doped germanium: Evidence for carrier-mediated ferromagnetism
We report the fabrication of Ge:Mn ferromagnetic semiconductors by Mn-ion implantation into Ge followed by pulsed laser annealing. Benefiting from the short time annealing, the hole concentration in Mn-implanted...
PublicationsQuantitative dopant profiling in semiconductors: A Kelvin probe force microscopy model
Kelvin probe force microscopy (KPFM) is used to investigate the electrostatic force between a conductive probe and nanostructured Si with shallow or buried selectively doped regions under ambient conditions....
PublicationsSpinel ferrite nanocrystals embedded inside ZnO: Magnetic, electronic, and magnetotransport properties
In this paper we show that spinel ferrite nanocrystals (NiFe2O4, and CoFe2O4) can be texturally embedded inside a ZnO matrix by ion implantation and postannealing. The two kinds of ferrites show different...
PublicationsPhotocurrent spectroscopy of deep levels in ZnO thin films
Epitaxial ZnO(0001) thin films have been grown by pulsed-laser deposition on a-Al2O3 and investigated by deep level transient spectroscopy (DLTS) and by Fourier transform infrared photocurrent (FTIR-PC)...
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