A5059089815- Advanced Electron Microscopy Techniques and Applications
- Photoreceptor and optogenetics research
- Electron and X-Ray Spectroscopy Techniques
- Photochromic and Fluorescence Chemistry
- Electronic and Structural Properties of Oxides
- 2D Materials and Applications
- Transition Metal Oxide Nanomaterials
- Supramolecular Self-Assembly in Materials
- Ga2O3 and related materials
- Advanced Fiber Laser Technologies
- Light effects on plants
- X-ray Spectroscopy and Fluorescence Analysis
- Magnetic and transport properties of perovskites and related materials
- Surface and Thin Film Phenomena
- Ferroelectric and Piezoelectric Materials
- Laser-Matter Interactions and Applications
- Quantum Dots Synthesis And Properties
- Iron-based superconductors research
- Multiferroics and related materials
- Advanced X-ray Imaging Techniques
- Machine Learning in Materials Science
- Crystallography and Radiation Phenomena
- Spectroscopy Techniques in Biomedical and Chemical Research
- Advanced Thermoelectric Materials and Devices
- Inorganic Chemistry and Materials
Max Planck Institute for the Structure and Dynamics of Matter
2016-2025
Aarhus University
2021-2024
Lawrence Berkeley National Laboratory
2020-2023
University of California, Berkeley
2022
Center for Free-Electron Laser Science
2016-2019
Universität Hamburg
2016-2019
University of Leeds
2016
Using light to control transient phases in quantum materials is an emerging route engineer new properties and functionality, with both thermal non-thermal observed out of equilibrium. Transient are expected be heterogeneous, either through photo-generated domain growth or by generating topological defects, this impacts the dynamics system. However, nanoscale heterogeneity has not been directly observed. Here we use time- spectrally resolved coherent X-ray imaging track prototypical induced...
Quasi-two-dimensional transition-metal dichalcogenides are a key platform for exploring emergent nanoscale phenomena arising from complex interactions. Access to the underlying degrees-of-freedom on their natural time scales motivates use of advanced ultrafast probes sensitive self-organised atomic-scale patterns. Here, we report first investigation TaTe2, which exhibits unique charge and lattice trimer order characterised by transition upon cooling stripe-like chains into $(3 \times 3)$...
The ability to resolve the dynamics of matter on its native temporal and spatial scales constitutes a key challenge convergent theme across chemistry, biology, materials science. last couple decades have witnessed ultrafast electron diffraction (UED) emerge as one forefront techniques with sensitivity atomic motions. Increasingly sophisticated UED instruments are being developed that aimed at increasing beam brightness in order observe structural signatures, but so far they been limited low...
The authors report the experimental band structure of layered 1T'-TaTe${}_{2}$ across a CDW-like phase transition and reveal existence nested quasi-one-dimensional Fermi surface in two-dimensional material.
In ultrafast electron diffraction (UED) experiments, accurate retrieval of time-resolved structural parameters, such as atomic coordinates and thermal displacement requires an scattering model. Unfortunately, kinematical models are often inaccurate even for relativistic probes, especially dense, oriented single crystals where strong channeling multiple effects present. This article introduces demonstrates dynamical tailored quantitative analysis UED experiments performed on single-crystal...
The ultrafast dynamics of unsubstituted spironaphthopyran (SNP) were investigated using femtosecond transient UV and visible absorption spectroscopy in three different solvents by semi-classical nuclear simulations. primary ring-opening the pyran unit was found to occur 300 fs yielding a non-planar intermediate first singlet excited state (S1). Subsequent planarisation relaxation product ground proceed through barrier crossing on S1 potential energy surface (PES) take place within 1.1 ps...
A ‘recover before destroy’ approach to minimise photoproduct build-up in solid state enables ultrafast studies of chemical reactions.
Isomerization through stereochemical changes and modulation in bond order conjugation are processes that occur ubiquitously diverse chemical systems for pho- tochromic spirocompounds, it imparts them their functionality as phototransformable molecules. However, these transformations have been notoriously challenging to observe crystals due steric hindrance but necessary ingredients the development of reversible spiro-based crystalline devices. Here we report detection spectroscopic...
Journal Article Relativistic Ultrafast Electron Diffraction of Nanomaterials Get access Daniel Durham, Durham University California, Berkeley, United States Search for other works by this author on: Oxford Academic Google Scholar Khalid Siddiqui, Siddiqui Lawrence Berkeley National Laboratory, Fuhao Ji, Ji SLAC Accelerator Menlo Park, Jorge Giner Navarro, Navarro Los Angeles, Pietro Musumeci, Musumeci Robert Kaindl, Kaindl Andrew Minor, Minor StatesLawrence Daniele Filippetto Microscopy and...
Measuring the spectral phase of a pulse is key for performing wavelength resolved ultrafast measurements in few femtosecond regime. However, accurate real experimental conditions can be challenging. We show that reflectivity change induced by coherent phonons quantum material used to infer an optical probe with few-femtosecond accuracy.
Isomerisation through stereochemical changes and modulation in bond order conjugation are processes that occur ubiquitously diverse chemical systems for photochromic spirocompounds, it imparts them their functionality as phototransformable molecules. However, these transformations have been notoriously challenging to observe crystals due steric hindrance but necessary ingredients the development of reversible spiro-based crystalline devices. Here, we report detection spectroscopic signatures...
Understanding how light modifies long-range order is key to improve our ability control material functionality on an ultrafast timescale. Transient spatial heterogeneity has been proposed in many materials, but isolating the dynamics of different regions experimentally challenging. Here we address this issue and measure orbital melting layered manganite, La0.5Sr1.5MnO4, isolate surface from bulk for first time. Bulk measurements show rapidly suppressed, correlation length surprisingly...
The ability to resolve the dynamics of matter on its native temporal and spatial scales constitutes a key challenge convergent theme across chemistry, biology, materials science. last couple decades have witnessed ultrafast electron diffraction (UED) emerge as one forefront techniques with sensitivity atomic motions. Increasingly sophisticated UED instruments are being developed that aimed at increasing beam brightness in order observe structural signatures, but so far they been limited low...
Ultrafast electron diffraction (UED) has become a leading technique for investigation of structural dynamics in solids providing high spatial and temporal resolutions. Radio frequency (RF) based photoinjectors Mega-electron-volt (MeV) scale beams are improving the source brightness instrument versatility largely responsible advancement field dynamics. At Lawrence Berkeley National Laboratory (LBNL), an RF photoinjector gun ultrafast studies using UED been development is now producing...
We use the PAL FEL to obtain time and energy-resolved coherent diffractive images of insulator-metal phase transition in VO 2 with femtosecond time, nanometer spatial resolution, enabling us directly visualize transition.
Relativistic ultrafast electron diffraction is used to track the transient structural dynamics of tantalum ditelluride. We observe rapid photo-induced melting its low-temperature trimer superstructure as driven by intra-trimer charge transfer.
Measuring the spectral phase of a pulse is key for performing wavelength resolved ultrafast measurements in few femtosecond regime. However, accurate real experimental conditions can be challenging. We show that reflectivity change induced by coherent phonons quantum material used to infer an optical probe with few-femtosecond accuracy.
Journal Article A Multislice Approach to Quantify Laser-Induced Lattice Temperature from Ultrafast Electron Diffraction Measurements of Single-Crystal Films Get access Daniel B Durham, Durham Department Materials Science and Engineering, University California, Berkeley, CA, United StatesNational Center for Microscopy, Lawrence Berkeley National Laboratory, States Corresponding author: dbdurham@berkeley.edu Search other works by this author on: Oxford Academic Google Scholar Khalid M...
We discuss our experiments that apply ultrafast electron diffraction (UED) to study structural dynamics of the phase transition in single crystal tantalum ditelluride, TaTe<sub>2</sub>, a quasi-2D quantum material which exhibits trimer superstructure at cryogenic temperatures. Intense near-infrared (NIR) pulses 1030 nm are employed quench low temperature, atomically ordered state and process is captured by ultrashort bunches electrons as function pump-probe time delay. The signatures recover...