Our research concerns the intersection of nanoscience and X-ray science. We use X-rays to investigate nanostructured devices, and we develop nanostructures as X-ray detectors. We have a strong collaboration with the Nanomax beamline at MAX IV, and we also visit other synchrotrons for experiments. Most of the projects also involve colleagues in NanoLund, and we are frequent users of the Lund Nano L

https://www.sljus.lu.se/jesper-wallentin-0 - 2025-07-27

CsPbBr3 metal halide perovskite nanowire X-ray detectors. A) Cross-sectional SEM and B) X-ray image of test pattern with 2 micron lines [Zhang 2022]. C) 3D X-ray microscopy of grains [Dierks 2022]. Metal halide perovskites are most famous for their rapid development in solar cells, but they are also promising materials for X-ray scintillation detectors. We are synthesizing CsPbBr3 nanowire arrays

https://www.sljus.lu.se/growth-metal-halide-perovskite-nanowires-x-ray-detection-applications - 2025-07-27

Freestanding CsPbBr3 nanowires. Left: Cross-sectional SEM of as-grown nanowires. Middle: Cross-sectional optical microscopy (not false colored) of blue-green CsPbCl1.1Br1.9-CsPbBr3 heterostructured nanowires [Zhang 2022]. Single nanowire transistor [Lamers 2022]. We have discovered a method to grow free-standing vertically aligned CsPbBr3 metal halide perovskites [Zhang 2022]. Part of the nanowire

https://www.sljus.lu.se/free-standing-metal-halide-perovskite-nanowires-devices-and-heterostructures - 2025-07-27

Left: The nanofocus at the NanoMax beamline, MAX IV, Lund [Chayanun 2020], imaged with a single nanowire. Right: X-ray beam induced current (XBIC) in a single nanowire [Chayanun 2019]. Traditional X-ray detectors use bulk crystals, which limits their resolution. In this project, financed by an ERC Starting Grant, we are developing vertical arrays of nanowires as high-resolution X-ray detectors. We

https://www.sljus.lu.se/nanostructured-x-ray-detectors-and-x-ray-beam-induced-current-xbic - 2025-07-27

3D strain simulation and measurement of axially heterostructured nanowire [Hammarberg 2020]. X-ray diffraction can be used to study strain, piezoelectricity and heating in crystalline samples. Modern X-ray optics can reach well below 100 nm focus size, and with coherent phase retrieval methods the spatial resolution can reach around 10 nm. Hard X-rays can penetrate through thick samples, allowing

https://www.sljus.lu.se/nanoscale-coherent-x-ray-diffraction - 2025-07-27

Imaging of ferroelastic domain dynamics in a CsPbBr3 perovskite nanowire as the temperature is ramped across a phase transition [Marcal 2020]. The Bragg peak and the domain pattern change as the temperature crosses the orthorhombic to tetragonal phase transition at 80C.   3D reconstruction of two ferroelastic domains in a CsPbBr3 nanoparticle [Dzhigaev 2021]. We have recently shown that it is poss

https://www.sljus.lu.se/x-ray-imaging-ferroic-domains - 2025-07-27

In this project, we have built a phase contrast X-ray tomograph based on a microfocus Cu source. Traditional X-ray imaging is based on absorption contrast, which has poor contrast for small and weakly absorbing samples. Much better contrast can be achieved using phase contrast [Dierks 2020]. The system is based on a microfocus X-ray source with a Cu target, a high-resolution detector and a high-pr

https://www.sljus.lu.se/phase-contrast-tomography - 2025-07-27

SummaryLight is indisputably at the origin of life on earth, driving all photo-chemical reactions in atmosphere, biological systems, and “man-made" energy related materials. On the atomic scale level, we can describe these photo-chemical reactions, through a multitude of elementary processes occurring on the ultrafast time scale (from sub femtosecond to picosecond) where the initial energy/light h

https://www.sljus.lu.se/research-landing-page/ultrafast-dynamics-small-quantum-systems-sqs - 2025-07-27

SummaryTechnical and industrial relevant chemical processes such as catalysis and electrochemistry occur at solid surfaces in complex environments in terms of material composition, pressure, temperature and medium. As a consequence, the atomic scale structure and the environmental composition close to the active material which governs the chemical processes are notoriously difficult to determine.T

https://www.sljus.lu.se/research-landing-page/catalysis-and-electrochemistry - 2025-07-27

Summary Ambient pressure cell at SPECIES Electron spectroscopy has provided much of our current knowledge on the chemical and physical processes involved in the complex interactions between a solid surface and its surroundings. Such processes are for example important for surface catalysis, corrosion and thin film growth.As the surface state depends strongly on its environment, it is vital that su

https://www.sljus.lu.se/research-landing-page/ambient-pressure-xps - 2025-07-27

Summary The interactions of electrons in materials are a rich and complex source of physical problems, in part due to the issues brought about by dealing with the large number of electronic many-body interactions, both with other electrons and with the parent ions.  These interactions give rise to fundamentally quantum mechanical states such as superconductivity and magnetism.  New quantum states

https://www.sljus.lu.se/research-landing-page/magnetism-and-superconductivity - 2025-07-27

SummaryWe develop and use methods for analysis of nanostructures with highest possible spatial and temporal resolution. One aim of this research is to understand the role of the surfaces and interfaces for their function and properties. Another goal is to study devices under as realistic conditions as possible. The aim is both fundamental physical understanding as well as enabling the design of no

https://www.sljus.lu.se/research-landing-page/semiconductor-nanostructures - 2025-07-27

SummaryAccelerator physics deals with how particle beams are created, accelerated, steered, measured and controlled to finally be tailored to specific purposes. This is relevant for laboratories such as ESS, CERN and the MAX IV, but also for medicine or semi-conductor development.The focus of the Accelerator Physics group is on electron accelerators to produce synchrotron radiation. While our main

https://www.sljus.lu.se/research-landing-page/accelerator-physics - 2025-07-27

SummaryWe develop and use novel methods for X-ray imaging with the highest possible spatial and temporal resolution.To this end, we use a wide range of X-ray imaging methods at different synchrotrons, including MAX IV in Lund, X-ray free-electron lasers, including European XFEL, as well as lab source systems. We collaborate with many other researchers, in particular at Lund University, MAX IV, and

https://www.sljus.lu.se/research/x-ray-imaging - 2025-07-27

Find publications in the research portalIn the Lund University Research Portal you can search for:Active researchers and doctoral students within our research areasResearch outputs, for example publicationsResearch projectsResearch infrastructuresResearch unitsThe Division’s profile in Lund University’s Research Portal Finished Bachelor's and Master's projects Finished degree projects at the Divis

https://www.sljus.lu.se/publications - 2025-07-27

Adresses Visiting addressLund UniversityDepartment of PhysicsDivision of Synchrotron Radiation ResearchProfessorsgatan 1SE-223 63 LundDelivery addressLund UniversityDepartment of PhysicsDivision of Synchrotron Radiation ResearchInstrumentmakaregränden 6SE-223 62 LundPostal addressLund UniversityDepartment of PhysicsDivision of Synchrotron Radiation ResearchBox 118SE-221 00 LundSweden Invoice addre

https://www.sljus.lu.se/contact - 2025-07-27

Ultrafast dynamics in small quantum systems Exploring the fundamental processes driven by light Catalysis and electrochemistry Catalysts and electrodes at work studied by light Ambient pressure x-ray photoelectron spectroscopy Making the next generation of 2D materials Magnetism and superconductivity Studying quantum states of matter Semiconductor nanostructures analysis Nanodevices at smallest ti

https://www.sljus.lu.se/research - 2025-07-27

Photoionization dynamics Illustration of an electron wave-packet emitted when attosecond pulses (blue) impinge an atom, schematized by a potential well. Attosecond pulses created by high harmonic generation (HHG) in gases allow us to study fundamental light-matter interaction processes with novel experimental techniques. The ultrashort light pulse leads to the creation of a wave packet that can be

https://www.sljus.lu.se/research/ultrafast-dynamics-small-quantum-systems-sqs/attoscience - 2025-07-27

Imaging dynamics of small molecules Intensity distribution of emitted proton (H+) and oxygen ion (O)+ viewed by our detector when the water molecule is resonantly excited by X-rays. Intensity distribution of emitted proton (H+) and oxygen ion (O)+ viewed by our detector when the water molecule is resonantly excited by X-rays.Atoms and molecules in electronically excited states decay via various pr

https://www.sljus.lu.se/research/ultrafast-dynamics-small-quantum-systems-sqs/imaging-dynamics-molecules - 2025-07-27

Cluster dynamics - a step towards complexity Illustration of water molecules (red) with ammonia molecules (blue-grey) in a nano-droplet. Photoinduced processes in complex systems can be modeled as a sequence of events initiated by the absorption of a photon. Photoionization of an atomic electron is followed by electronic relaxation which results in a migration of charge within the atom. The need t

https://www.sljus.lu.se/research/ultrafast-dynamics-small-quantum-systems-sqs/dynamics-clusters - 2025-07-27