جستجوی استاد راهنمای دانشگاهی

Wolf Widdraمشاهده پروفایل

استاد

• Surface Physics
• Quasicrystals
• Oxide Materials
• +۵ مورد دیگر

Prof. Dr. Wolf Widdra is a Principal Investigator at the Institute of Physics, Martin Luther University Halle-Wittenberg, where he leads the Surface Science Group. He serves as Principal Investigator for projects A06 and iRTG within the TRR227 Collaborative Research Center focused on ultrafast spin dynamics. His research spans several cutting-edge areas in surface physics. Widdra's group pioneered the discovery of two-dimensional oxide quasicrystals, representing a new class of materials beyond traditional metal alloy quasicrystals. His team investigates the formation mechanisms of these structures from materials like $$\text{BaTiO}_3$$ and $$\text{SrTiO}_3$$ on Pt(111) surfaces, employing advanced techniques including scanning tunneling microscopy (STM), LEED, SXRD, XPS, and various spectroscopic methods. The group also studies alkali-induced surface effects in chalcogenide solar cells and conducts nanometer-resolved investigations of ultrafast spin and electron dynamics at magnetic surfaces. Widdra collaborates extensively through the TRR227 network with the Free University of Berlin and participates in international projects co-funded by ANR and DFG, particularly focusing on phason dynamics in oxide quasicrystals using synchrotron-based measurements and high-temperature STM. His laboratory utilizes a comprehensive suite of surface analysis techniques including diffraction methods (LEED & SXRD), microscopy (STM, AFM, PEEM, LEEM), and spectroscopies (XPS, UPS, ARUPS, 2PPE, STS, HREELS) to investigate two-dimensional oxide systems and their applications in both fundamental science and renewable energy technologies.

Clemens von Korff Schmisingمشاهده پروفایل

پژوهشگر

• Ultrafast Magnetism
• Spin Dynamics
• X-ray Spectroscopy
• +۵ مورد دیگر

Dr. Clemens von Korff Schmising serves as Department Head of Electron and Spin Dynamics (B1) at the Max-Born-Institute for Nonlinear Optics and Short-Time Spectroscopy in Berlin. He also holds positions as Project Coordinator for Solids and Nanostructures: Electrons, Spins, and Phonons (3.2) and Project Member for Transient Structures and Imaging with X-rays (3.3). As a Principal Investigator in the TRR227 research consortium, he leads significant work in ultrafast magnetism and spin dynamics. His research program focuses on controlling quantum degrees of freedom (spin, orbital angular momentum, and polarization) through light-driven excitation techniques. He investigates ferromagnetic and ferrimagnetic metallic thin films and multilayers, examining how magnetic and chemical nanoscale inhomogeneities influence ultrafast spin dynamics and magnetic switching. His group develops advanced spectroscopic probes in the extreme ultraviolet and soft X-ray spectral ranges to access element-specific magnetization dynamics, while also designing plasmonic structures to confine optical excitation at subwavelength scales. Analysis of his recent publications reveals a strong focus on nanoscale magnetic control, with significant contributions to understanding all-optical switching mechanisms, plasmon-enhanced magnetic effects, and ultrafast magnetization dynamics. His work bridges fundamental physics with potential applications in next-generation magnetic data storage technologies, demonstrating expertise across experimental ultrafast science, nanophotonics, and magnetic materials. His career trajectory shows consistent progression from doctoral studies through postdoctoral positions to his current leadership role. He completed his Ph.D. at Max-Born-Institute/Humboldt University Berlin with research on ultrafast X-ray scattering, followed by postdoctoral work at Lund University (supported by the Swedish National Research Foundation) and Technische Universität Berlin before becoming a Scientist at Max-Born-Institute in 2015.

Christian Kumpfمشاهده پروفایل

استاد

• Electron Microscopy
• X-ray Diffraction
• Surface Science
• +۵ مورد دیگر

Christian Kumpf is a Professor at RWTH Aachen University (Department of Experimentalphysik IV A) and Group Leader/Professor at Forschungszentrum Jülich (Peter Grünberg Institut, PGI-3). He obtained his education at Friedrich-Alexander-Universität Erlangen-Nürnberg (Diplom Physik), University of Rostock (Dr. rer. nat.), and Julius-Maximilians-Universität Würzburg (Dr. habil.), with postdoctoral training at Forskningscenter Risø. His research specializes in surface science and nanoscale characterization, with key interests in: Electron and X-ray diffraction techniques Aberration-corrected spectromicroscopy Epitaxial growth of 2D materials (graphene, bismuthene, h-BN) Molecular adsorption and interface structures Quantum materials characterization Real-time surface imaging Recent publications (2019-2025) focus on quantum materials interfaces, epitaxial growth mechanisms of 2D materials, molecular adsorption studies, and advanced characterization techniques. His work consistently appears in high-impact journals including Nature Communications, Physical Review Letters, and Advanced Materials. He leads the Diffraction Methods and Electron Microscopy Group at Forschungszentrum Jülich, operating specialized instrumentation including an aberration-corrected spectroscopic low energy electron microscope for surface studies.

• Electron microscopy
• Defects in advanced materials
• Thin films
• +۷ مورد دیگر

Dr. Corneliu GHICA is a Scientific Researcher I and Head of the Laboratory of Atomic Structures and Defects in Advanced Materials (LASDAM) at the National Institute of Materials Physics. His work focuses on advanced materials characterization using atomic-resolution electron microscopy techniques and development of functional materials for applications in sensors, electronics, and energy technologies. Dr. GHICA's educational background includes: PhD in Physics (2001): 'Study of thin films deposited by laser ablation: manganites with colossal magnetoresistance effect' from University of Bucharest and Louis Pasteur University of Strasbourg PhD in Physics (1995): Optical engineering, optical spectroscopy and laser technologies from University of Bucharest BSc Physics (1994): Optical engineering, optical spectroscopy and laser technologies from University of Bucharest His research expertise centers on in-depth microstructural characterization of advanced materials using aberration-corrected transmission electron microscopy. He specializes in quantitative HRTEM analysis of strain fields associated with defects and interfaces, and structure-properties correlation in thin films and nanostructured materials. His work spans ferroelectric materials, gas sensors, and electronic devices, with emphasis on atomic-resolution techniques like HRTEM, STEM, EDS, and EELS. Dr. GHICA's recent publications reveal a strong focus on functional oxide materials, particularly zirconia-based systems for electronic applications, and development of advanced gas sensors. His research combines experimental characterization with theoretical modeling, demonstrating expertise in both materials synthesis and advanced characterization techniques. The work shows increasing international collaboration across Europe with applications spanning energy conversion, environmental monitoring, and electronic devices. Dr. GHICA has led multiple significant research projects: Nanoscaled ferroelectric (pseudo)-binary oxide thin film supercapacitors (NanOx4Estor) - M-ERA.NET project (2022-2024) Interplay structure-functionality in nanostructured materials for gas sensors - Mobility project (2019-2020) From 2D to 3D+ nanoscale characterization of advanced functional materials - PCE project (2017-2019) Atomically resolved structure and interface phenomena in nano-scale modulated smart materials - PCE project (2013-2015) Laser processing of defects induced in silicon by RF plasma hydrogenation - PCE project (2007-2010) As Head of LASDAM, Dr. GHICA leads a team focused on atomic-scale materials characterization using advanced electron microscopy techniques. The laboratory specializes in TEM specimen preparation, thin film deposition by PVD, PLD and sol-gel, and in-situ/operando experiments to study material behavior under real operating conditions. His expertise in electron microscopy makes him a valuable resource for the broader scientific community.

Ruxandra Costescuمشاهده پروفایل

پژوهشگر

• Materials Science
• Nanotechnology
• Thin Film Deposition
• +۷ مورد دیگر

Dr. Ruxandra Costescu is a Scientific Researcher II at the National Institute for Materials Physics (NIMP) in Romania, where she works in the Laboratory of Surface and Interface Science. She has been part of NIMP since early 2010, contributing to in-depth studies of interfaces between ferromagnetic layers and semiconductor substrates, and specializing in X-ray Photoelectron Spectroscopy (XPS) analysis. Prior to joining NIMP, she held post-doctoral positions between 2004 and 2008 at Max-Planck-Institut für Festkörperforschung in Germany and the Leibniz Institute for Solid State and Materials Research. Dr. Costescu completed her doctoral research program in Materials Science and Engineering at University of Illinois Urbana-Champaign in 2006, with a dissertation on 'Thermal transport on the nanometer scale and the effect of microstructure and interface resistance.' Her academic journey demonstrates a strong foundation in materials characterization and thin film technology. Her research focuses on materials science, particularly in the areas of thin film deposition and characterization techniques, molecular beam epitaxy (MBE), and interface science. She has made significant contributions to understanding the properties of TiO2-based materials, ferromagnetic-semiconductor interfaces, and the development of advanced characterization techniques. Her work spans multiple disciplines including nanotechnology, photocatalysis, ferroelectric materials, and semiconductor physics, with applications ranging from environmental remediation to spintronics. Analysis of her publication record reveals a consistent focus on developing and characterizing novel materials for applications in environmental remediation, energy conversion, and spintronics. A notable trend in her recent work is the investigation of doped TiO2 nanostructures for enhanced photocatalytic activity in water purification, as well as studies of magnetic properties at interfaces between different materials for potential spintronic applications. Dr. Costescu has received several prestigious awards for her research: 'IN HOC SIGNO VINCES' award (in Math and Natural Sciences) from the Romanian National Council of Scientific Research in Higher Education (CNCSIS) in 2010 Award for Best Young Researcher in 2010 from the State Department of Education, the Romanian Research and Design Patronage and the Romanian Academy She has secured significant research funding, including a CNCSIS reintegration grant for young researchers between 2010 and 2012, which enabled her to purchase and implement a new MBE chamber at NIMP. Since 2018, she has served as the NIMP coordinator for European Commission 'Horizon 2020' science popularization projects, working in partnership with other research institutes and universities. She also coordinates science education activities and outreach at NIMP. At NIMP, Dr. Costescu is one of the responsible persons for a Complex Surface Science System (included in the Special Systems and Objectives of National Interest 'IOSIN' program) and administers an XPS system with spatial resolution. Her laboratory work involves both fundamental research on material interfaces and practical applications in areas such as water purification and antimicrobial coatings, demonstrating her commitment to both theoretical understanding and real-world impact.

• Ferromagnetic thin films
• Ferroelectric thin films
• Extended X-ray Absorption Fine Structure spectroscopy
• +۱ مورد دیگر

Dr. George-Adrian LUNGU is a Scientific Researcher III at the National Institute of Materials Physics in Măgurele, Romania, where he works in the Surfaces and Interfaces Laboratory. Born on December 3, 1978 in Braşov, Romania, he has established a distinguished career in condensed matter physics and materials science with a focus on surface and interface phenomena. His educational background includes: B.Sc. in Physics from the University of Bucharest (2002) M.Sc. in Solid State Physics and Polymer Physics from the University of Bucharest (2004) Ph.D. in Physics from the University of Bucharest (2014) with thesis "Structural and magnetic properties of certain thin films" Dr. LUNGU's research expertise spans several critical areas of modern materials science: Ferromagnetic thin films for spintronic applications Ferroelectric thin films and their surface properties Advanced characterization using Extended X-ray Absorption Fine Structure (EXAFS) spectroscopy Chemical analysis through X-ray Photoelectron Spectroscopy (XPS) His multidisciplinary approach combines experimental techniques with theoretical understanding to investigate the structural, magnetic, and electronic properties of novel materials systems, with significant implications for applications in optoelectronics, spintronics, and energy technologies. With 47 published papers and an h-index of 12, Dr. LUNGU's recent work demonstrates a strong focus on the intersection of ferroelectricity, magnetism, and surface science. His publications reveal expertise in analyzing complex material systems, particularly in the areas of room-temperature ferromagnetism in semiconductor systems, CO 2 adsorption on ferroelectric surfaces, and electrical properties of novel thin film structures. Notable contributions include: Research on ferromagnetic thin films and their applications Studies on graphene-ferroelectric material interactions Investigations of magnetic properties in diluted magnetic semiconductors Development of advanced characterization techniques for surface analysis Dr. LUNGU has also contributed to collaborative efforts in large-scale scientific projects, including work with the Compact Muon Solenoid (CMS) Collaboration of the Large Hadron Collider (LHC) at CERN from January 2005 to May 2006, where he worked on the CMS Detector Tracker building.

Elena-Larisa Borcanمشاهده پروفایل

پژوهشگر

• Surface Science
• Interface Science
• Materials Science
• +۳ مورد دیگر

Elena-Larisa Borcan is an Assistant Researcher at the National Institute of Materials Physics (NIMP) in Magurele, Romania, where she has worked since March 2016. She is concurrently pursuing doctoral studies at the University of Bucharest while conducting experimental research on surface and interface phenomena. Her academic background includes: PhD in Solid State Physics (ongoing), University of Bucharest, Faculty of Physics MS in Engineering and Applications of Lasers and Accelerators, University Politehnica of Bucharest (2016-2018) BS in Physics Applied in Engineering, University Politehnica of Bucharest (2012-2016) Borcan specializes in surface characterization using advanced spectroscopic techniques including XPS, LEED, Auger Electron Spectroscopy, STM, and ARPES. Her research investigates electronic structure anomalies in oxide materials, particularly spin asymmetry phenomena in SrTiO 3 surfaces arising from oxygen termination and partial neutralization effects. She focuses on how surface reconstructions and defect states influence magnetic properties in transition metal oxides. Her recent publications (2024-2025) demonstrate consistent focus on spin-resolved photoelectron spectroscopy of SrTiO 3 surfaces. The work reveals how oxygen vacancy configurations drive unexpected magnetic behavior in non-magnetic oxides, with implications for spintronic applications. Key methodologies involve correlating core-level shifts with spin asymmetry measurements to map surface charge distributions. No scientific awards were documented in the source material. Information regarding student advising or research grant management was not provided in the available documentation. She operates within NIMP's Laboratory of Surface and Interface Science, where she conducts molecular beam epitaxy depositions on atomically clean substrates and performs advanced spectral deconvolution of XPS data to analyze surface electronic structures.

Matthias Dietrich Frontzekمشاهده پروفایل

پژوهشگر

• Magnetism
• Neutron Scattering
• Quantum Materials
• +۲ مورد دیگر

Matthias Dietrich Frontzek serves as an Instrument Scientist at the WAND² diffractometer within Oak Ridge National Laboratory's High Flux Isotope Reactor (HFIR). He concurrently leads the HFIR Beryllium Reflector Replacement project as matrixed scientist, chairs the high-temperature-sample-environment committee, and participates in the US-Japan cooperative neutron scattering research program. His academic foundation includes a Diploma (MS) in Physics from Technical University Dresden (2003) and a PhD in Physics from the same institution (2009), where his thesis on R2PdSi3 magnetic properties utilized neutron scattering at Helmholtz-Zentrum Berlin under Michael Loewenhaupt. Frontzek's research specializes in neutron scattering investigations of quantum magnetic phenomena, with emphasis on frustrated spin systems, topological materials, and rare-earth compounds. His work reveals intricate magnetic structures in kagome/hyperkagome lattices, Dirac/Weyl semimetals, and skyrmion-hosting materials, leveraging diffraction techniques to probe phase transitions and collective excitations at atomic scales. Recent publications demonstrate a concentrated focus on emergent quantum states where geometric frustration intersects with topological band structures. Key trends include van Hove singularity-driven spin density waves, skyrmion stabilization mechanisms in centrosymmetric materials, and quantum criticality in geometrically frustrated magnets, with neutron diffraction serving as the primary investigative tool across these diverse material systems. His scientific recognition includes: PSI Fellow at Paul Scherrer Institut Frontzek directs major infrastructure initiatives including the HFIR Beryllium Reflector Replacement project critical for reactor longevity and chairs the high-temperature-sample-environment committee supporting advanced user experiments. His international collaboration through the US-Japan program facilitates cross-continental neutron research, while instrument development efforts like ANDiE (Autonomous Neutron Diffraction Explorer) implement machine learning for real-time experimental optimization. Operating within ORNL's Powder Diffraction Group of the Diffraction Section, Frontzek manages the WAND² instrument user program that serves global researchers studying magnetic and structural properties of quantum materials through neutron powder diffraction techniques.

Julia Weinsteinمشاهده پروفایل

استاد

• Photochemistry
• Ultrafast Spectroscopy
• Photocatalysis
• +۶ مورد دیگر

Julia Weinstein is a Professor of Physical Chemistry in the Department of Chemistry at the University of Sheffield, where she has been since 2005. Her educational background includes: Diploma in Chemistry (with honours) from Moscow Lomonosov State University (1990) PhD from Moscow Lomonosov State University (1994) Professor Weinstein's research spans photochemistry and ultrafast spectroscopy, with applications in photocatalysis, photodynamic therapy, and antibacterial treatments. Her group utilizes advanced techniques including time-resolved infrared and Raman spectroscopy to study charge, spin, and structural dynamics in condensed phases. Current work focuses on vibronic coupling, optical control of charge transfer, and time-resolved X-ray spectroscopy as part of the UK XFEL project science team. She has received several prestigious awards and fellowships: Lomonosov Award in Science (2003) John Van Geuns Lecture (2004) RSC Chemical Dynamics Award (2017) Royal Society/NATO Postdoctoral Fellowship (2000) EPSRC Advanced Research Fellowship (2004) Professor Weinstein leads a research group at Sheffield and maintains a long-standing collaboration with the Central Laser Facility of the STFC, serving on advisory boards for Chemical Science and Faraday Discussions journals.