Category: Events

Dr. Nenad Lazarević from the Center for Solid State Physics and New Materials delivered an invited talk "Lattice, spin, and charge excitations in Fe(Se:S)" at the SuperQumap Project Conference: Superconducting Nanodevices and Quantum Materials for Coherent Manipulation: Topological states in superconductors and magnetic materials , held from May 6–9 at Liblice Chateau, Czech Republic. The conference, organized under the COST Action CA21144, focused on superconducting nanodevices and quantum materials for coherent manipulation of topological states in superconductors and magnetic materials.

Dr. Lazarević's presentation contributed to discussions on the interplay between disorder, metastability, and hidden phases in low-dimensional quantum systems, aligning with the HIP-2D-QM project's objectives. His participation also strengthened international collaboration within the European quantum materials research community.

On April 8, 2025, Dr. Jelena Pešić from the Institute of Physics Belgrade delivered a lecture titled "The 2D Materials Revolution: Potential of Semiconductor Nanonetworks" at the Ilija M. Kolarac Endowment. This event was part of the "New Materials" public lecture series, organized in collaboration with the Institute of Physics in Belgrade.

Dr. Pešić discussed the remarkable properties of two-dimensional (2D) materials, such as graphene and molybdenum disulfide (MoS₂), emphasizing their potential applications in nanoelectronics, sensors, and energy devices. She highlighted the significance of 2D material nanonetworks, particularly those composed of interconnected MoS₂ nanosheets, in facilitating the fabrication of complex devices. These structures pave the way for cost-effective and scalable technologies, including next-generation transistors, sensors, and flexible electronics.

On April 1, 2025, Dr. Emil Božin from the Institute of Physics Belgrade delivered a lecture titled "Detection of Nanoscale Hidden Phases in Quantum Materials at Large Research Facilities" at the Ilija M. Kolarac Endowment. This event was part of the "New Materials" public lecture series, organized in collaboration with the Institute of Physics in Belgrade.

Dr. Božin discussed the use of advanced experimental setups at large-scale research facilities—such as synchrotrons, neutron sources, and free-electron lasers—to investigate the relationships between structure and properties in solid-state physics and chemistry. The lecture focused on hidden, emerging, and precursor states of electronic phase transitions and their role in enabling and controlling technologically relevant properties of quantum materials, from charge density waves to high-efficiency thermoelectricity. A key method highlighted was total scattering based on the atomic pair distribution function, crucial for studying such elusive states of matter.

On March 27, 2025, Dr. Gheorghe Lucian Pascut from MANSiD Research Center and the Faculty of Forestry at Stefan Cel Mare University (USV), Suceava, Romania, delivered a seminar titled "Predictive Power of the Embedded Dynamical Mean Field Theory (eDMFT) for the Electronic-Structural Interplay in Correlated Materials" at the Institute of Physics Belgrade, in the "Zvonko Marić" lecture hall.

Dr. Pascut presented the capabilities and predictive potential of eDMFT in modeling complex correlations between electronic and structural properties in advanced materials. We thank Dr. Pascut and all attendees for their valuable contributions!

Abstract:
In this talk we will give an overview of the embedded dynamical mean field theory (eDMFT) [1, 2] perspective on materials such as AMnO3 (A = Bi and La) perovskites, CaFeO3, RNiO3 nickelates (R = La and Nd) and RNiO2 nickelates (R = La and Nd) in order to show the capabilities of the eDMFT method to describe site and orbital selective states. For example, (1) in AMnO3 perovskites we are addressing the multiple first-order transitions, in particular we will compute the complex temperature-dependent electronic structural-interply and we are finding the existence of novel electronic states where insulating, semimetallic and metallic orbitals coexist. (2) in CaFeO3 we show that the high oxidations states can also be explained by orbital selective states.  We will also demonstrate de the predictive power of the eDMFT method for both the electronic and structural properties [3]; (3) in RNiO3 nickelates we are describing the electronic-structural interply across a metal to insulator transition (MIT) [4], in particular we will present the predicted structural changes across the MIT, predicted models for the magnetic ground states which differ from the magnetic models proposed before, and we will also present a new interpretation of the K-edge resonant X-ray scattering measurements; (4) in RNiO2 which are part of the recently discovered superconductivity in hole doped infinite-layer nickelates, we will present the theoretically proposed temperature-correlation phase diagram for the LaNiO2 prototype compound, and we show Fermi liquid (FL) versus non-FL and magnetic versus non-magnetic Curie-Weiss behaviors [5].
In conclusion I will argue the eDMFT method can be used to understand and quantitatively predict the electronic structural interply in complex correlated materials at finite temperatures.

Part of this work was supported by a grant of the Romanian Ministry of Education and Research, CNCS - UEFISCDI, project number PN-III-P1-1.1-TE-2019-1767, within PNCDI III.

1) http://hauleweb.rutgers.edu/tutorials/
2) http://hauleweb.rutgers.edu/tutorials/Overview.html
3) K. Haule, G. L. Pascut, Scientific Reports 2017, 7, 10375.
4) G. L. Pascut, K. Haule, Phys. Rev. B 2023, 107, 045147.
5) G. L. Pascut et. al., Communications Physics 2023, 6, 45.

On March 25, 2025, Dr. Nenad Lazarević from the Institute of Physics Belgrade delivered a lecture titled "The Iron Age of Superconductivity – The Case of Fe(Se:S)" at the Ilija M. Kolarac Endowment. This event was part of public lecture series on new materials, organized in collaboration with the Institute of Physics in Belgrade.

Dr. Lazarević highlighted the role of the Center for Solid State Physics and New Materials in global quantum materials research, particularly through the international project "Hidden Phases in 2D Quantum Materials" (HIP-2D-QM). The lecture focused on the so-called "iron age of superconductivity," examining phononic, spin, and electronic excitations in Fe(Se:S) compounds. He demonstrated how Raman spectroscopy effectively probes charge and spin dynamics in Fe(Se:S) and discussed the impact of uniaxial strain on the lattice dynamics of FeSe.

This presentation offered valuable insights into the fundamental phenomena of quantum materials and the future directions of research in this field.

On Thursday, March 20, 2025, the workshop titled "Visualization and Analysis of Crystal Structures Using the VESTA Program" was successfully conducted at the seminar room of the Center for Solid State Physics and New Materials.

Led by Andrijana Solajić and Jelena Pešić, the session was primarily targeted at PhD students, though it also welcomed participants from all academic levels interested in crystallography. Attendees gained hands-on experience with the VESTA software, learning practical skills for visualizing crystallographic .cif files, creating high-quality crystal structure images, and analyzing lattice parameters and interatomic distances.

This workshop is part of the HIP-2D-QM project's ongoing initiatives aimed at spreading excellence, enhancing skills, and building capacity in advanced materials research.

We thank all participants for their active engagement and look forward to hosting more skill-building workshops in the future!

On February 26, 2025, Dr. Ivna Kavre Piltaver from the Faculty of Physics and the Centre for Micro- and Nanosciences and Technologies, University of Rijeka, delivered a seminar entitled "Atomic Layer Deposition of Semiconductor Thin Films for Photocatalytic Application" at the Institute of Physics Belgrade, in the "Zvonko Marić" lecture hall.

Dr. Kavre Piltaver introduced advanced methods of atomic layer deposition (ALD) for semiconductor thin films, discussing their promising applications in photocatalysis and environmental technologies. The seminar encouraged active discussion and valuable exchange of expertise among attendees.

This event reflects the Center for Solid State Physics and New Materials' ongoing efforts to strengthen regional scientific cooperation, promote knowledge sharing, and advance collaborative research initiatives within the HIP-2D-QM project.

We sincerely thank Dr. Kavre Piltaver and all participants for their engaging contributions!

Abstract:
Water pollution caused by industrial development and the release of organic pollutants presents a significant environmental challenge. As a result, wastewater recycling has become a global priority, demanding innovative solutions. One promising approach to address this issue is the photocatalytic degradation of pollutants, which utilizes light energy and semiconductor materials to break down organic contaminants into harmless by-products such as carbon dioxide and water. Recent research has concentrated on the development of efficient photocatalysts capable of performing this degradation process effectively. During the seminar, the instruments available at the University of Rijeka, Faculty of Physics, and the Centre for Micro- and Nanosciences and Technologies will be presented, along with the recently published research results, where the photocatalytic activity of copper-doped zinc oxide (ZnO) thin films, synthesized using the atomic layer deposition method, was studied. Analysis using scanning electron microscopy and X-ray diffraction reveals a polycrystalline structure, with a decrease in crystallinity as the Cu content increases. X-ray photoelectron spectroscopy confirms the presence of copper in the Cu+ oxidation state for samples with a Cu content lower than 1 at. %, suggesting that copper ions occupy substitutional CuZn acceptor sites in ZnO, which results in p-type conductivity. Additionally, the Cu-doped ZnO films exhibit enhanced optical absorption in the visible region, as demonstrated by UV-Vis measurements. The reduced electron-hole recombination rate, due to significantly lower intrinsic free charge carrier concentrations in the doped samples, coupled with increased light absorption in the visible region, leads to a substantial improvement in photocatalytic efficiency under simulated sunlight irradiation.

On February 26, 2025, a meeting was held at the Institute of Physics Belgrade between the ERA Chair HIP-2D-QM team members, IPB Director Dr. Aleksandar Bogojević, and representatives of Anton Paar GmbH, Graz Austria – Mina Mitrović Jeremić (MCLabor, local representative) and Dietmar Kröger (Distribution Partner Management EMEA Anton Paar). The discussion focused on potential collaboration in advanced measurement techniques and the joint development of research equipment to support cutting-edge material characterization.