G. E. Marques
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View article: Magnetoabsorption and spin polarization inversion in GaAs/AlGaAs quantum wells
Magnetoabsorption and spin polarization inversion in GaAs/AlGaAs quantum wells Open
The impact of the growth orientation on spin dynamics in GaAs/AlGaAs quantum wells (QWs) is explored through magnetophotoluminescence measurements. Samples grown on both (100) and (311)A GaAs surfaces exhibit intensity oscillations at high…
View article: Raman scattering owing to magneto-polaron states in monolayer transition metal dichalcogenides
Raman scattering owing to magneto-polaron states in monolayer transition metal dichalcogenides Open
Magneto-optical measurements are fundamental research tools that allow for studying the hitherto unexplored optical transitions and the related applications of topological two-dimensional (2D) transition metal dichalcogenides (TMDs). A the…
View article: Lattice vibration modes and electron–phonon interactions in monolayer <i>vs.</i> bilayer of transition metal dichalcogenides
Lattice vibration modes and electron–phonon interactions in monolayer <i>vs.</i> bilayer of transition metal dichalcogenides Open
Phonon spectra of transition metal dichalcogenides are studied using first principles calculations and Born–Huang model phenomenological description.
View article: Magnetic field effects on the valence band of AlGaAs and InGaAsP parabolic quantum wells
Magnetic field effects on the valence band of AlGaAs and InGaAsP parabolic quantum wells Open
The influence of the valence band structure on the optical properties of quantum wells with a parabolic potential, consisting of ${\mathrm{Al}}_{x}{\mathrm{Ga}}_{1\ensuremath{-}x}\mathrm{As}$ and ${\mathrm{In}}_{1\ensuremath{-}x}{\mathrm{G…
View article: Lingering Times at Resonance: The Case of Sb-based Tunneling Devices
Lingering Times at Resonance: The Case of Sb-based Tunneling Devices Open
Concurrent natural time scales related to relaxation, recombination, trapping, and drifting processes rule the semiconductor heterostructures' response to external drives when charge carrier fluxes are induced. This paper highlights the ro…
View article: Spin-dependent analysis of homogeneous and inhomogeneous exciton decoherence in magnetic fields
Spin-dependent analysis of homogeneous and inhomogeneous exciton decoherence in magnetic fields Open
This paper discusses the combined effects of optical excitation power, interface roughness, lattice temperature, and applied magnetic fields on the spin coherence of excitonic states in GaAs/AlGaAs multiple quantum wells. For low optical p…
View article: Optical Mapping of Nonequilibrium Charge Carriers
Optical Mapping of Nonequilibrium Charge Carriers Open
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View article: Microwave-Driven Hexagonal-to-Monoclinic Transition in BiPO<sub>4</sub>: An In-Depth Experimental Investigation and First-Principles Study
Microwave-Driven Hexagonal-to-Monoclinic Transition in BiPO<sub>4</sub>: An In-Depth Experimental Investigation and First-Principles Study Open
Present theoretical and experimental work provides an in-depth understanding of the morphological, structural, electronic, and optical properties of hexagonal and monoclinic polymorphs of bismuth phosphate (BiPO4). Herein, we demonstrate h…
View article: Resonant tunneling of electrons in AlSb/GaInAsSb double barrier quantum wells
Resonant tunneling of electrons in AlSb/GaInAsSb double barrier quantum wells Open
We have studied the optical and electronic transport properties of n-type AlSb/GaInAsSb double barrier quantum well resonant tunneling diodes (RTDs). The RTDs were grown by molecular beam epitaxy on GaSb substrates. Collector, quantum well…
View article: Tailoring the physical and chemical properties of Sn<sub>1−x</sub>Co<sub>x</sub>O<sub>2</sub> nanoparticles: an experimental and theoretical approach
Tailoring the physical and chemical properties of Sn<sub>1−x</sub>Co<sub>x</sub>O<sub>2</sub> nanoparticles: an experimental and theoretical approach Open
In this work, we present a coupled experimental and theoretical first-principles investigation on one of the more promising oxide-diluted magnetic semiconductors, the Sn1−xCoxO2 nanoparticle system, in order to see the effect of cobalt dop…
View article: Multi-dimensional architecture of Ag/α-Ag<sub>2</sub>WO<sub>4</sub> crystals: insights into microstructural, morphological, and photoluminescence properties
Multi-dimensional architecture of Ag/α-Ag<sub>2</sub>WO<sub>4</sub> crystals: insights into microstructural, morphological, and photoluminescence properties Open
Varying the concentration of ethylenediamine resulted in hollow or solid Ag/α-Ag2WO4 microflowers that emit light in the red region or in the blue region, respectively.
View article: Experimental and ab Initio Studies of Deep-Bulk Traps in Doped Rare-Earth Oxide Thick Films
Experimental and ab Initio Studies of Deep-Bulk Traps in Doped Rare-Earth Oxide Thick Films Open
Lanthanum-doped CeO2 is a promising semiconductor for gas sensing. A combined study applying impedance spectroscopy and first-principles calculations was performed for pure and lanthanum-doped samples. The results showed a strong influence…
View article: Magnetically controlled exciton transfer in hybrid quantum-dot–quantum-well nanostructures
Magnetically controlled exciton transfer in hybrid quantum-dot–quantum-well nanostructures Open
A magnetophotoluminescence study of the carrier transfer with hybrid InAs/GaAs-quantum-dot-InGaAs-quantum-well structures is carried out where we observe an unusual dependence of the photoluminescence (PL) on the GaAs barrier thickness at …
View article: Evidence for the formation of metallic In after laser irradiation of InP
Evidence for the formation of metallic In after laser irradiation of InP Open
Structural and electronic changes induced by laser irradiation are currently of interest owing to the possibility to tune the mechanical, optical, and transport properties of the irradiated materials. In this work, we investigate the effec…
View article: Defect-induced magnetism in II-VI quantum dots
Defect-induced magnetism in II-VI quantum dots Open
The identification of physical parameters that lead to magnetism in apparent nonmagnetic semiconductor systems has continuously challenged our community. In particular, for quantum-dot systems, they are key factors that contribute to their…
View article: Photomodulation of transport in monolayer dichalcogenides
Photomodulation of transport in monolayer dichalcogenides Open
Surface functionalization emerges as an alternative pathway for electronic structure engineering in two-dimensional (2D) systems. We explore a hybrid heterostructure built from a 2D transition-metal dichalcogenide atop a layer of photochro…
View article: Direct preparation of standard functional interfaces in oxide heterostructures for 2DEG analysis through beam-induced platinum contacts
Direct preparation of standard functional interfaces in oxide heterostructures for 2DEG analysis through beam-induced platinum contacts Open
Two-dimensional electron gas (2DEG) in SrTiO3/LaAlO3 heterostructures has been extensively studied in the last few years; however, little attention has been given to a practical way to contact electrically the low dimensional gas at the in…
View article: Azobenzene Adsorption on the MoS<sub>2</sub>(0001) Surface: A Density Functional Investigation within van der Waals Corrections
Azobenzene Adsorption on the MoS<sub>2</sub>(0001) Surface: A Density Functional Investigation within van der Waals Corrections Open
The interest in light-sensitive organic molecules, such as azobenzene, has increased because of their ability to functionalize two-dimensional layered systems and engineer their electronic structure. In this work, we explore the azobenzene…
View article: Interplay between structure asymmetry, defect-induced localization, and spin-orbit interaction in Mn-doped quantum dots
Interplay between structure asymmetry, defect-induced localization, and spin-orbit interaction in Mn-doped quantum dots Open
Combining atomistic methods and effective mass approaches, the magnetic field response of Mn-doped deformed quantum dots has been characterized. The defect-induced asymmetry triggers unavoidable spin-orbit coupling effects that become more…
View article: Recombination kinetics of photogenerated electrons in InGaAs/InP quantum wells
Recombination kinetics of photogenerated electrons in InGaAs/InP quantum wells Open
The electron transport and recombination processes of photoexcited electron-hole pairs were studied in InGaAs/InP single quantum wells. Comprehensive transport data analysis reveals a asymmetric shape of the quantum well potential where th…