S2PAM15 - 15. Studentská vědecká konference fyziky pevných látek, fotoniky a materiálů

Contribution List

Contributions are in draft mode

While in draft mode, regular users cannot see the contributions and timetable.

24. Aplikace monokrystalové rentgenové difrakce ve strukturní chemii boranových klastrů a jejich derivátů

Monika Kučeráková

Příspěvek demonstruje klíčovou roli pokročilé monokrystalové rentgenové difrakce v chemii boranových klastrů a ukazuje, že znalost přesného trojrozměrného uspořádání je kritickým předpokladem pro pochopení vztahů mezi strukturou a makroskopickými vlastnostmi. Prezentované výsledky mapují přechod od fundamentálních vlastností klastrů k jejich využití v pokročilých nanomateriálech. V oblasti...

6. AtOx: Atomic oxygen generation by pulsed electron discharge

Mr Jáchym Lis (KIPL FJFI ČVUT)

Atomic oxygen production technology is a key factor for various research fields, from surface treatment research to ageing studies, sterilization or spacecraft exposure testing.
The atomic oxygen generator (AtOx) is a modification of a novel Ionized Jet Deposition method developed by Noivion Coating s.r.o. It works on the principle of pulsed high voltage discharge being triggered in a hollow...

14. Crystallographic Absurdities in Scientific Literature

Dr Petr Veřtát (FZU - Institute of Physics of the Czech Academy of Sciences)

The pressure to publish as many articles as possible leads to an alarming rise of absurd crystallographic results across scientific journals. This talk showcases striking anomalies encountered over recent years - from fabricated XRD patterns and deleted peaks to mismatched fits and hallucinated AI text. Crucially, the goal is not merely to catalogue bad science, but also to introduce...

20. Development of a substrate heater for deposition of thin films of YBCO-based superconductors by Ionized Jet Deposition

Jan Kouřil (CVUT)

Ionized Jet Deposition is a thin film deposition method. Due to its ability to maintain stechiometry of the deposited material, it is suitable for deposition of YBCO-based superconductors. For the growth of the superconducting phase, the substrate needs to be at an elevated temperature of 600 - 900 °C. Theredore, a substrate heater is needed for the deposition of a superconducting phase. Four...

11. Energy Storage

Ladislav Kalvoda (CTU in Prague, FNSPE, Department of Solid State Engineering)

Efficient energy storage represents one of the key scientific and technological challenges of our time. The talk begins with an overview and assessment of the wide range of physical principles currently used for energy storage, followed by a selection of specific problems for which the technological infrastructure available at the Laboratory of Applied Photonics and Quantum Technologies at...

19. Fatigue behavior of additively manufactured materials

Štěpán Hortlík

The application of additively manufactured (AM) components in
critical energy, aerospace, and biomedical fields is currently limited
by a lack of fatigue life data. To streamline testing, this work presents
a new methodology that utilizes a unique resonant device developed
at KMAT FNSPE CTU. This approach enables the determination of a
complete S-N curve within a single working day....

9. From Electron Density to Electrostatic Potential: Comparing X-ray Diffraction and Electron Microscopy

Petr Kolenko (České vysoké učení technické v Praze)

The determination of atomic structure is a central goal of modern structural science. X-ray diffraction and electron microscopy are among the most important techniques used for this purpose, yet they provide different types of structural information. While X-ray diffraction is primarily sensitive to the electron density distribution in a crystal, electron microscopy maps the electrostatic...

12. High temperature testing of small scale Ni superalloy specimens

Katarína Horská (KMAT, FJFI)

Nickel superalloys are an indispensable part of the aerospace industry. Over the last few decades, research surrounding them has started to focus on different methods of additive manufacturing, which provide the possibility of faster production of more complex geometries. Similar to their conventionally manufactured counterparts, additively manufactured nickel superalloys are expected to find...

13. Interaction of nanodiamonds with nucleic acid components

Elisabeth Zaluska (Institute of Physics of the Czech Academy of Sciences (FZU), Prague, Czech Republic)

Abstract:
Detonation nanodiamonds (DNDs) can be tailored through their surface chemistry and surface
charge, making them promising materials for biomedical applications, including nucleic acid
delivery. This thesis investigated how hydrogenation and oxidation of the DND surface influence
interactions with nucleic acid components and evaluated the potential of these materials for direct...

4. LIDT: A Key Characteristic of Optical Components

František Novák (FZÚ, HiLASE; ČVUT)

The achievable powers and intensities in laser systems continue to increase owing to advances in ultrashort-pulse generation and amplification, fiber lasers, cooling techniques, and laser diode technology. However, these increasingly high optical powers and intensities impose stringent requirements on the optical components used in laser systems. Although significant improvements in laser...

25. Machine learning potential for perovskite materials

Zdeněk Holman (Katedra inženýrství pevných látek, FJFI ČVUT)

Accurate atomistic simulations of ferroelectric perovskites require interatomic potentials that capture the coupling between local atomic displacements, lattice deformation, and collective structural ordering. This work develops an independent machine-learning interatomic potential for BaTiO₃ and PbTiO₃, trained on density-functional-theory energies, forces, and stresses. The current...

10. Magnetism mediated lattice stability in Heusler alloys: a first-principles study

Jakub Luštinec (CTU FNSPE)

Magnetic ordering can strongly influence phase stability in Heusler alloys. In this contribution, first-principles calculations will be presented for two Heusler alloys exhibiting unique shape memory effects connected to magnetic ordering. In Co-Cr-(Ga, Si), a reentrant martensitic transformation occurs due to the change of magnetic ordering. In Ni-Mn-Ga, the magnetic shape memory effect is...

1. Martensitic transition in metamagnetic shape memory alloys

Nastasja Viktorovna Samochvalova

Metamagnetic shape memory alloys (MSMAs) exhibit a martensitic transformation coupled with a large change in magnetization, enabling magnetic-field-induced strain. Their practical use, however, is strongly limited by thermal and magnetic hysteresis. This work investigates Ni-Mn-based and Pd-Mn-Ga alloys prepared by induction and arc melting, followed by controlled heat treatment and aging,...

8. MOVPE GaN growth on patterned sapphire substrate

Jan Batysta (FZU/FJFI)

GaN technology relies on special nucleation layer and annealing in order to grow a high quality crystal despite large lattice mismatch between GaN and Sapphire. This method is further improved by using substrates with periodic pattern, where different geometry of facet growth on the pattern leads to efficient annihilation and bending of threading dislocations. We studied different growth...

22. Nitrogen Ion Implantation of Bulk Titanium Using an ATOX

Jakub Skočdopole (CTU FNSPE)

This work investigates the effects of nitrogen ion implantation on bulk titanium using an ATOX operating with N₂ gas. The implanted samples were characterized by X-ray diffraction (XRD), nanoindentation, optical microscopy, atomic force microscopy (AFM), and scanning electron microscopy coupled with energy-dispersive spectroscopy (SEM/EDS). XRD analysis confirmed the effective incorporation of...

18. Optimization of Ag/TiO₂₋ₓ Multilayer Thin Films Deposited by Ionized Jet Deposition for SPR-Based Hydrogen Sensing

soorya jayan (University of Salento)

Surface plasmon resonance (SPR) is highly sensitive to changes in the optical properties of thin films and the surrounding environment at the metal–dielectric interface, making it promising for optical gas sensing. In this work, Ag/TiO₂₋ₓ multilayer thin films fabricated by Ionized Jet Deposition (IJD) were systematically investigated and optimized for SPR-based hydrogen (H₂) sensing, focusing...

16. Outlook on Damage Thresholds of Optical Components for High-Power UV–DUV Laser Systems

Fauzul Rizal (Czech Technical University in Prague)

Laser-induced damage limits the performance and useful lifetime of optical components in high-power ultraviolet (UV) and deep-ultraviolet (DUV) laser systems. This contribution reviews damage thresholds in fused silica and dielectric coatings, exploring how irradiation conditions, material quality, and surface condition affect damage behaviour. It distinguishes between damage onset, growth,...

26. Polymer Etching and Polishing Using an ATOX

Martin Kolář

Plasma treatment can be used to modify surface of polymers. This research investigates etching and polishing of several polymers using ATOX with oxygen and argon gas. After plasma treatment increased wettability was observed by comparing water droplets on treated and untreated surfaces. Etching depth and surface roughness was analysed using AFM. Etching depth correlated with hardness and...

27. Quantum Hyperion 2

Martin Dráb (CTU FNSPE)

Over the last year and a half, the shared Quantum Hyperion cluster of the DSSE and DLPP was slowly being prepared for a major upgrade into Quabntum Hyperion 2. Aside from a new system it has also received certain hardware upgrade and for a short while, there will be a huge computing upgrade available for everyone. There are also certain complications on the way, which may need to be solved one...

29. REBCO HTS wires: from preparation to application

Michal Jůza (FJFI ČVUT v Praze)

The discovery of High-temperature superconductors (HTS) in 1980s brought great expectations and optimism regarding the large-scale usage of the superconductivity for demanding industrial and energy applications. However, the potential of High-temperature superconductors remains unfulfilled. To this date, the technologies based on superconductivity still relies mostly on Low-temperature...

17. Reliability of XRD residual stress profiling after electropolishing: comparative verification using strain gage measurement

Marek Rušin

Due to the low penetration depth of X rays, stepwise material removal is required for the study of subsurface regions. Electrolytic polishing is commonly employed for this purpose and is generally assumed to have a negligible influence on the quantities of interest, even though the material may seek a new equilibrium. In residual stress analysis, such relaxation could introduce an error in the...

23. SharpED: machine-learning restoration of crystallographic electron-density maps

Jiří Zelenka (KIPL, FJFI, ČVUT)

Crystallography never observes atoms directly. Diffraction yields reciprocal-space data from which electron-density maps are reconstructed and only then interpreted as atomic structures. Where the data are incomplete, noisy, or resolution-limited, density maxima broaden, merge, shift, or vanish, and conventional interpretation fails.

I present SharpED, a three-dimensional map-to-map neural...

21. Silicon sensitisation via energy transfer

Lukáš Gdula (Department of Electrotechnology, Faculty of Electrical Engineering Czech Technical University in Prague)

Energy transfer from affordable organic dye with high quantum yield to silicon substrate could lead to design of highly efficient ultrathin silicon solar cells. This work gives overview of used depositing techniques, characterisation methods and the energy transfer is evaluated in regard to the dye – silicon distance by measuring the dye photoluminescence quenching. Luminescence polarization...

5. Simulace materiálů s tvarovou pamětí v termodynamickém rámci standardních zobecněných materiálů a s pomocí modelů založených na strojovém učení

Vojtěch Stránský

Chování slitin s tvarovou pamětí na bázi Ni-Ti se popisuje konstitutivními modely, v nichž je makroskopická odezva v každém časovém kroku určena výpočetně náročnou minimalizací volné energie přes vnitřní proměnné. Cílem práce bylo nahradit tento minimalizační krok v jednorozměrném modelu neuronovou sítí a zrychlit tak simulaci při zachování přesnosti referenčního řešiče. Byla navržena...

28. Smart Optimization for Physics Experiments: Bayesian Structure Estimation

Mr Aleksej Gaj (Department of Solid State Engineering, FNSPE CTU & Department of Adaptive Systems, UTIA CAS)

In solid-state physics experiments, such as Ionized Jet Deposition (IJD), researchers can tune numerous input parameters (e.g., temperature, pressure, deposition time). However, typically only a small subset of these inputs significantly influences the final material properties. Because individual experimental runs are time-consuming and expensive, testing every combination of variables is...

2. Study of photoluminescence dynamics during the formation of perovskite quantum dots and passivation of perovskite structures

Ondřej Piroutek

Lead halide perovskites represent a promising candidate material for optoelectronic devices due to their exceptional physical properties namely defect tolerance, long charge-carrier lifetimes, and extended diffusion lengths. Despite these promising properties, the potential of lead halide perovskites is still hindered by limited stability and defect formation. This study focuses on two...

3. Tip-enhanced photoluminescence excitation spectroscopy of single chromophores with sub 5 μeV resolution

Petr Kahan (IOCB, FZU, FJFI)

Resolution of the tip-enhanced photoluminescence from single chromophores in the nanocavity of a scanning probe microscope is limited primarily by the lifetime broadening and vibronic coupling due to the breakdown of Kasha’s rule. Photoluminescence excitation (PLE) spectroscopy overcomes the latter limitation by selectively addressing individual optical transitions. We apply tip-enhanced PLE...

15. Tradice a perspektivy konferencí českých a slovenských fyziků

Štefan Zajac (Faculty of Nuclear Sciences and Physical Engineering , Czech Technical University in Prague)

Impulzem k pořádání pravidelných novodobých konferencí českých a slovenských fyziků byl vznik Evropské fyzikální společnosti (EPS) v roce 1968. Na celostátním aktivu fyziků 18.června 1968 v Praze byla v rámci Jednoty československých matematiků a fyziků ustavena Fyzikální vědecká sekce (FVS), která se zapojila do EPS jako zakládající kolektivní člen. Následně FVS JČMF uspořádala 1. konferenci...

7. Using X-ray diffraction to investigate surface integrity

Jiří Čapek

The aim is to proof that X-ray diffraction is a comprehensive, quantitative, and non-destructive method for analyzing surface integrity and predicting the fatigue behavior of metal components. This work summarizes findings from seven publications of prestigious journals focusing on the influence of technological processes (machining, shot peening, laser hardening, welding) on residual...