Author's posts
Jun 04
New article in Nanoscale
A new article from our collaboration with the UFV is out in Nanoscale: Lattice stability and elastic evolution of CdTe membranes fabrication using a III-V heterostructures as a substrate CdTe is a key binary compound for II-VI semiconductor systems since the precise control of its growth over different semiconductor materials of different orientations provides a …
May 09
New Grant in Quantum Technology
Our group member Saimon Filipe Covre da Silva won a Young Investigators (JP) grant “Solid state single-photon sources for telecom frequencies” from FAPESP (24/08527-2) for quantum technologies in the Program in Quantum Technologies (QuTIa). The project will be realized here in the IFGW, and we have the pleasure of hosting him for the time of …
Feb 23
New article in Phys. Rev. Materials
Direct observation of large-area strain propagation on free-standing nanomembranes Investigations on epitaxial nanostructures with size of tens of nanometers have been a challenging issue for techniques that present high strain sensitivity but restricted spatial resolution. This is the case of recently developed x-ray nanoprobe techniques. Despite its inherent nondestructive character, submicron x-ray spots have only …
Dec 14
New publication in “Journal of Physical Chemistry C” by group member
Strain Tuning in Graded SiGe on Insulator: Interplay between Local Concentration and Nonmonotonic Lattice Evolution after Ge Condensation Germanium condensation has proven to be a reliable route for obtaining smoothly graded composition SiGe layers with good reproducibility and reduced defect density. The process is known as a crucial tool to induce well-defined strain on Si …
Nov 25
Master student for CNPq position
With the granting of the CNPq project (408219/2022-0) from call “Chamada CNPq/SEMPI/MCTI Nº 57/2022 – MESTRADO OU DOUTORADO EM COMPUTAÇÃO QUÂNTICA, FOTÔNICA INTEGRADA E INTELIGÊNCIA ARTIFICIAL”, Prof. Christoph Deneke has an open position for a master student to work in the area of photonics. The position is available from now on to start in the …
Mar 08
Renovation of lab space
With the money from the FAEPEX project 2102/21, we could carry out some long needed renovation of the lab space. In January 2022, we renewed the chemical working places, created a common working space as well as improved the overall installations of the lab. We will also clean out some old instruments to do a …
Feb 24
New article by group member
Strain-based band structure engineering is a powerful tool to tune the optical and electronic properties of semiconductor nanostructures. We show that we can tune the band structure of InGaAs semiconductor quantum wells and modify the helicity of the emitted light by integrating them into rolled-up heterostructures and changing their geometrical configuration. Experimental results from photoluminescence …
Nov 30
Presentation of PIBIC project – Pedro Carneiro
For the annual PIBIC congress, Pedro made a video poster of his work: “Desenvolvimento de um experimento de quantificação da concentração de elementos por fluorescência de raios X e aplicação para o estudo de modelos de epilepsia em roedores”.
Nov 27
Presentation of PIBIC project – Gabriel Gomes
For the annual PIBIC congress, Gabriel made a video poster of his work “Fabricação e caracterização de membranas baseadas em nanoestruturas semicondutoras”.
Mar 19
New article by group member: Band structure engineering in strain-free GaAs mesoscopic structures
We investigate the optical properties of strain-free mesoscopic GaAs/Al(x)Ga(1-x)As structures (MGS) coupled to thin GaAs/A(x)Ga(1-x)As quantum wells (QWs) with varying Al content (x). We demonstrate that quenching the QW emission by controlling the band crossover between AlGaAs X-point and GaAs Gamma-point gives rise to long carrier lifetimes and enhanced optical emission from the MGS. For …
