Hands-on experiments with Amazing Theatre of Physics (in Czech "Úžasné divadlo fyziky (UDIF)" )
High-resolution and high surface-sensitive in-situ core-level photoelectron spectra will be presented and briefly discussed.
The main purpose of the work is to study the intricate and complex phenomena occurring at the surface and interface during the growth mechanism of Ga, Al, GaN on SiC, including the analysis of heterostructures. All the processes are followed in-situ by photoelectron...
Plasmonic antennas are often fabricated by lithographic patterning of a thin metallic film and its properties are then intimately related to the quality of the resulting structures. Here we compare two kinds of thin gold films: polycrystalline thin film deposited by magnetron sputtering, and chemically synthesized monocrystalline gold platelet. Both metallic substrates were used to fabricate...
The semiconductor–metal transition (SMT) enables multiple applications of one single material, especially in modern devices. How to control it remains one of the most intriguing questions in material physics/chemistry, especially in two-dimensional layered materials. In this work, we report realization of SMT in MoS2–xOx bilayers, driven by the concentration gradient of the chalcogen atom...
On-surface chemistry represents a fast-growing field allowing to synthetize molecular structures not available by traditional wet chemistry. In combination with high-resolution scanning probe technique providing the unprecedented spatial resolution, individual products of reactions can be precisely identified. Nevertheless, a deep understanding of the reaction mechanism under the conditions...
During the last decade, an increasing number of papers indicated that 2D materials are transparent to intermolecular interactions [1,2,3]. This phenomenon leads to the fact that electronic properties of underlying surface can penetrate through 2D materials, and was demonstrated by e.g. substrate-governed epitaxial growth on top of a 2D material interfacial layer [2,3].
The strength of...
Surface-guided planar nanowires show a lot of promise for integration into practical devices [1], but that is conditioned upon understanding their synthesis in detail. In this work, we investigate the VLS growth of ZnSe nanowires by chemical vapor deposition, guided by the steps on annealed M-plane sapphire substrate [2].
We have developed a reactor compatible with SEM and, although the...
Gold nanocones can show several plasmonic resonances and can be used to enhance light–matter interactions or for location-specific plasmonic sensing. Their fabrication often utilizes so-called self-shading effect, which occurs during metal film evaporation into circular nanowells. We present a view on the fabrication of ordered arrays of gold nanocones using electron beam lithography and...
STEM-EELS has become a standard technique to map localized surface plasmon resonances (LSPR), which are collective oscillations of free electrons in metal nano- and microstructures. Despite that many works dealing with EELS measurement of LSPR have been published over the last 15 years, there has been no experimental work discussing the experimental conditions during the measurement....
A biological membrane forms a dynamic and complex barrier between compartments of the living cell and its environment. However, its in vivo studies are difficult because it consists of a high variety of lipids and proteins and is continuously reorganized by the cell. Giant unilamellar vesicles (GUVs) are a powerful model system of the cell membrane due to their comparable size and membrane...
Nanocomposites of PMMA: BiOCl with different concentrations of BiOCl (5, 10, 15 wt%) were prepared by using simple solution cast technique. Prepared nanocomposites as well as BiOCl nanostructure characteristics were examined by using XRD, FESEM and EDAX. Morphology revels that the developed nanostructure of the filler (BiOCl) is of rose like geometry, which composed of dozens rapidly grown...
One of the ways to solve the rear-contact related limitations of dominant p-type c-Si homojunction solar technology is the implementation of the passivating contact. This type of contact typically consists of a layer stack, where one layer effectively passivates the surface of the Si wafer and another layer acts as a selective contact for one type of the charge-carriers. One of the possible...
Nitride semiconductors became the second most important semiconductor material after silicon in the last two decades. Many daily used devices, such as blue light emitting diodes or high electron mobility transistors in electronic devices, are based on nitride semiconductors. Despite the nitride devices mass production, there are many open questions and not well understood phenomena which have...
Full understanding of nanostructures' formation is a key for engineering of their physical properties. At nanoscale, this is a very challenging task. Electron microscopy is conventionally used for post-growth analysis of the fabricated nanostructures, and the growers have therefore no choice than perform time-consuming numerous experimental runs with uncertain results. These are often combined...
The key enabling factor for Spin Wave (SW) technology utilization for building ultra-low power circuits is the ability to energy efficiently cascade SW basic computation blocks. SW Majority gates, which constitute a universal gate set for this paradigm, operating on phase encoded data are not input output coherent in terms of SW amplitude. Thus, their cascading requires information...
Magnetic antiskyrmions may occur in cases where the magnetic chirality is anisotropic. In another word, DMI with opposite signs along two perpendicular directions can stabilize antiskyrmions [1]. They were theoretically predicted in certain tetragonal materials with D2d symmetry [2]. This topological spin structure plays a crucial role in low dimensional magnetic systems, where topological...
Recent years have seen a growing interest in strong coupling between plasmons and excitons, as a way to generate new quantum optical testbeds and influence chemical dynamics and reactivity. Strong coupling to bright plasmonic modes has been achieved even with single quantum emitters. Dark plasmonic modes fare better in some applications due to longer lifetimes, but are difficult to probe as...
X-ray Photoelectron Spectroscopy is frequently used method for elemental and chemical analysis of surfaces and ultra thin films. By using proper model, the method is also able to obtain information about morphology, for example thickness of ultra thin films. Information depth is dependent on energy of incident X-ray radiation, therefore it is twice higher in case of using Ag Lα (2984.3 eV)...
