Author's posts
Nov 09
Electronic Labbook (ELN) software
Our ELN software has hit version 1.4 and is now complete. It can manage your research data by Samples, has a Wiki for documentation of processes, a dedicated instrumentation journal (for things not related to samples but to equipment) and finally an item inventory to track your stuff. It is written in Python using the …
Jul 28
New article in Nanotechnology
Our paper “Review: using rolled-up tubes for strain-tuning the optical properties of quantum emitters” is out. Rolled-up tubes based on released III–V heterostructures have been extensively studied and established as optical resonators in the last two decades. In this review, we discuss how light emitters (quantum wells and quantum dots) are influenced by the inherently …
Feb 23
New article in Physical Review 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”
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 …
Feb 02
New article in “Nanotechnology” is out: Imaging the electrostatic landscape of unstrained self-assemble GaAs quantum dots
Unstrained GaAs quantum dots are promising candidates for quantum information devices due to their optical properties, but their electronic properties have remained relatively unexplored until now. In this work, we systematically investigate the electronic structure and natural charging of GaAs quantum dots at room temperature using Kelvin probe force microscopy (KPFM). We observe a clear …
Nov 19
New article in “Small” out
Reconfiguration of Amorphous Complex Oxides: A Route to a Broad Range of Assembly Phenomena, Hybrid Materials, and Novel Functionalities Reconfiguration of amorphous complex oxides provides a readily controllable source of stress that can be leveraged in nanoscale assembly to access a broad range of 3D geometries and hybrid materials. An amorphous SrTiO3 layer on a …
Apr 04
Featured by SPBMat
Our last article has been featured by the Brazilian Material Research Society: See their post “Engenharia de estrutura de banda usando a geometria de tubos enrolados.” Thanks for this.
Feb 24
New article in ACS Applied Nano Materials
After seeing the effect the first time 10 years ago in old samples, we finally figured out what was happening. See out latest results in ACS Appl. Nano Mater. with the title “Rolled-Up Quantum Wells Composed of Nanolayered InGaAs/GaAs Heterostructures as Optical Materials for Quantum Information Technology”: Strain-based band structure engineering is a powerful tool …
Feb 01
Nice book for people interested in Science
I finished reading a very good philosophy book trying to figure out, what makes science in its way to acquire knowledge different from other approaches. “The Scientific Attitude: Defending Science from Denial, Fraud, and Pseudoscience” by Lee McIntyre is interesting making the point the difference is not the method, but the attitude how evidence is …
Mar 19
New article: 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 …
