A5090221346- Semiconductor Quantum Structures and Devices
- Quantum and electron transport phenomena
- 2D Materials and Applications
- Semiconductor materials and devices
- Quantum Dots Synthesis And Properties
- ZnO doping and properties
- Nanowire Synthesis and Applications
- Perovskite Materials and Applications
- Semiconductor Lasers and Optical Devices
- Graphene research and applications
- Luminescence Properties of Advanced Materials
- Advanced Semiconductor Detectors and Materials
- Electronic and Structural Properties of Oxides
- Advanced Photocatalysis Techniques
- Chalcogenide Semiconductor Thin Films
- TiO2 Photocatalysis and Solar Cells
- GaN-based semiconductor devices and materials
- Transition Metal Oxide Nanomaterials
- Semiconductor materials and interfaces
- Advancements in Semiconductor Devices and Circuit Design
- Molecular Junctions and Nanostructures
- Organic Light-Emitting Diodes Research
- MXene and MAX Phase Materials
- Physics of Superconductivity and Magnetism
- Organic Electronics and Photovoltaics
Universidade Federal de São Carlos
2015-2024
Universidade Federal de Lavras
2022
Universidade de São Paulo
2005-2022
Universidade Federal de Alfenas
2022
Radboud University Nijmegen
2018-2021
University of Nottingham
2014
Chalmers University of Technology
2014
Cairo University
2014
Leibniz Institute for Crystal Growth
2014
Universidade Federal de Santa Catarina
1997-2005
We report a comprehensive discussion of quantum interference effects due to the finite structure neutral excitons in rings and their first experimental corroboration observed optical recombinations. The signatures built-in electric fields temperature on are demonstrated by theoretical models that describe modulation pattern confirmed complementary procedures.
van der Waals heterostructures composed of two-dimensional (2D) transition metal dichalcogenides and vdW magnetic materials offer an intriguing platform to functionalize valley excitonic properties in nonmagnetic TMDs. Here, we report magneto photoluminescence (PL) investigations monolayer (ML) MoSe2 on the layered A-type antiferromagnetic (AFM) semiconductor CrSBr under different field orientations. Our results reveal a clear influence order optical MoSe2, such as anomalous...
The carrier localization phenomenon has been investigated for GaBiAs by photomodulated transmittance (PT) and photoluminescence (PL). In the case of PT measurements, a decrease in energy-gap related signal clearly observed below 180 K. PL spectra broad emission band very sensitive to excitation power found. comparison transition, this is shifted red. recombination time at low temperature decreases from 0.7 0.35 ns with increase energy. All findings are clear evidences strong alloy.
Phyllosilicate minerals are an emerging class of naturally occurring layered insulators with large bandgap energy that have gained attention from the scientific community. This lamellar materials has been recently explored at ultrathin two-dimensional level due to their specific mechanical, electrical, magnetic, and optoelectronic properties, which crucial for engineering novel devices (including heterostructures). Due these phyllosilicates can be considered promising low-cost nanomaterials...
Strain plays an important role for the optical properties of monolayer transition metal dichalcogenides (TMDCs). Here, we investigate strain effects in a MoSe2 sample with large bubble region using μ-Raman, second harmonic generation (SHG), μ-photoluminescence and magneto at low temperature. Remarkably, our results reveal presence non-uniform field observation emission peaks lower energies which are signatures exciton trion quasiparticles red-shifted by region, agreement theoretical...
We have investigated the optical and magneto-optical properties of monolayer (ML) WSe2 on flakes β-Ga2O3 under high magnetic fields. Remarkably, sharp emission peaks were observed associated with localized excitons related to point defects. A detailed study low-temperature photoluminescence (PL) magneto-PL perpendicular field up 9 T was carried out. Several shown valley g-factors values close −4, which is an unusual result for in WSe2. Furthermore, some PL higher g-factor ≈−7 ≈−12,...
Heterostructures, composed of semiconducting transition-metal dichalcogenides (TMDC) and magnetic van-der-Waals materials, offer exciting prospects for the manipulation TMDC valley properties via proximity interaction with material. We show that atomic monolayer MoSe2 antiferromagnetic crystal CrSBr leads to an unexpected breaking time-reversal symmetry, originally perpendicular spin directions in both materials. The observed effect can be traced back a proximity-induced exchange...
Van der Waals epitaxially grown WS<sub>2</sub> monolayers and laser effects on their optical properties are reported.
Novel magnetic metals and metal oxides that use both the spin charge of an electron offer exciting technological applications. Their discovery could boost research on functional nanoscale materials. Here, for first time, we report magnetization α-Ag2WO4 under beam femtosecond laser irradiation. The formation growth silver (AgO, Ag2O, Ag3O4) Ag nanofilaments can be observed surface crystals. These features were also present in composition extruded material open new avenues magnetism studies....
We find significant optical and electronic enhancements of transition metal dichalcogenides on talc dielectrics compared to SiO 2 substrates, making promising for future van der Waals optoelectronics.
We report on a detailed study of low-temperature photoluminescence (PL) and magnetophotoluminescence under perpendicular magnetic fields (up to 30 T) circularly polarized excitation high-quality monolayer (ML) ${\mathrm{WS}}_{2}$ thick layer (120 nm) talc dielectric. Remarkably, we obtained samples without any evidence localized exciton emission at low temperature PL linewidth comparable that ${\mathrm{WS}}_{2}/h$-$\mathrm{BN}$ samples. As consequence, observe well-resolved peaks due the...
We investigated the valley Zeeman splitting of excitonic peaks in microphotoluminescence (μPL) spectra high-quality hBN/WS2/MoSe2/hBN heterostructures under perpendicular magnetic fields up to 20 T. identify two neutral exciton μPL spectra; lower-energy peak exhibits a reduced g-factor relative that higher energy and much lower than recently reported values for interlayer excitons other van der Waals (vdW) heterostructures. provide evidence such discernible stems from spatial confinement...
Abstract Biotite, an iron-rich mineral belonging to the trioctahedral mica group, is a naturally abundant layered material (LM) exhibiting attractive electronic properties for application in nanodevices. Biotite stands out as non-degradable LM under ambient conditions, featuring high-quality basal cleavage—a significant advantage van der Waals heterostructure (vdWH) applications. In this work, we present micro-mechanical exfoliation of biotite down monolayers (1Ls), yielding ultrathin flakes...
Monolayer transition metal dichalcogenides (TMDs) have emerged as promising materials to generate single-photon emitters (SPEs). While there are several previous reports in the literature about TMD-based SPEs, precise nature of excitonic states involved them is still under debate. Here, we use magneto-optical techniques in-plane and out-of-plane magnetic fields investigate SPEs WSe