Andrej Singer
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View article: DONUT: physics-aware machine learning for real-time X-ray nanodiffraction analysis
DONUT: physics-aware machine learning for real-time X-ray nanodiffraction analysis Open
Coherent X-ray scattering techniques are critical for investigating the fundamental structural properties of materials at the nanoscale. While advancements have made these experiments more accessible, real-time analysis remains a significa…
View article: Synthesis and Electronic Structure of the Fractionally Occupied Double Perovskite EuTa<sub>2</sub>O<sub>6</sub> with Ordered Europium Vacancies
Synthesis and Electronic Structure of the Fractionally Occupied Double Perovskite EuTa<sub>2</sub>O<sub>6</sub> with Ordered Europium Vacancies Open
2D electronic states underline a wide range of exotic phenomena and provide potential for electronic devices. The ability to create and control these states often requires physical thinning or highly perfect interfaces. In this work, the “…
View article: Memory in strain-tuned insulator-metal-insulator sequence of transitions after photoexcitation in the Mott material V2O3
Memory in strain-tuned insulator-metal-insulator sequence of transitions after photoexcitation in the Mott material V2O3 Open
Memory effects during metal-insulator transitions in quantum materials reveal complex physics and potential for novel electronics mimicking biological neural systems. Nonetheless, understanding of memory and nonlinearity in sequential non-…
View article: DONUT: Physics-aware Machine Learning for Real-time X-ray Nanodiffraction Analysis
DONUT: Physics-aware Machine Learning for Real-time X-ray Nanodiffraction Analysis Open
Coherent X-ray scattering techniques are critical for investigating the fundamental structural properties of materials at the nanoscale. While advancements have made these experiments more accessible, real-time analysis remains a significa…
View article: Strain-induced superconductivity in RuO2(100) thin-films
Strain-induced superconductivity in RuO2(100) thin-films Open
Recently, superconductivity was discovered with a superconducting transition temperature (T c ) of 2 K in strained (110)-oriented RuO2 films grown on TiO2(110) single-crystal substrates. In this work, we predict and realize superconductivi…
View article: Deep learning of structural morphology imaged by scanning X-ray diffraction microscopy
Deep learning of structural morphology imaged by scanning X-ray diffraction microscopy Open
Scanning X-ray nanodiffraction microscopy is a powerful technique for spatially resolving nanoscale structural morphologies by diffraction contrast. One of the critical challenges in experimental nanodiffraction data analysis is posed by t…
View article: Picosecond expansion in LaAlO3 resonantly driven by infrared-active phonons
Picosecond expansion in LaAlO3 resonantly driven by infrared-active phonons Open
We investigate the ultrafast structural dynamics of LaAlO3 thin films driven by short mid-infrared laser pulses at 20 THz. Time-resolved X-ray diffraction reveals an immediate lattice expansion and an acoustic breathing mode of the film. F…
View article: Colossal Strain Tuning of Ferroelectric Transitions in KNbO<sub>3</sub> Thin Films
Colossal Strain Tuning of Ferroelectric Transitions in KNbO<sub>3</sub> Thin Films Open
Strong coupling between polarization ( P ) and strain (ɛ) in ferroelectric complex oxides offers unique opportunities to dramatically tune their properties. Here colossal strain tuning of ferroelectricity in epitaxial KNbO 3 thin films gro…
View article: Self-activated epitaxial growth of ScN films from molecular nitrogen at low temperatures
Self-activated epitaxial growth of ScN films from molecular nitrogen at low temperatures Open
Unlike naturally occurring oxide crystals such as ruby and gemstones, there are no naturally occurring nitride crystals because the triple bond of the nitrogen molecule is one of the strongest bonds in nature. Here, we report that when the…
View article: Bragg coherent diffractive imaging for defects analysis: Principles, applications, and challenges
Bragg coherent diffractive imaging for defects analysis: Principles, applications, and challenges Open
The ability to visualize crystalline defects and lattice distortions at the nanoscale holds profound implications for enhancing material properties and optimizing their design. Bragg coherent diffractive imaging (BCDI) emerged as a powerfu…
View article: Spontaneous Supercrystal Formation During a Strain‐Engineered Metal–Insulator Transition (Adv. Mater. 32/2024)
Spontaneous Supercrystal Formation During a Strain‐Engineered Metal–Insulator Transition (Adv. Mater. 32/2024) Open
Spontaneous Supercrystal Formation In article number 2403873, Oleg Yu. Gorobtsov and co-workers discover a new anisotropic structural hierarchy over multiple length scales forming spontaneously in thin films of a Mott insulator Ca2RuO4. Th…
View article: Lithiation Induced Phases in 1T′-MoTe<sub>2</sub> Nanoflakes
Lithiation Induced Phases in 1T′-MoTe<sub>2</sub> Nanoflakes Open
Multiple polytypes of MoTe2 with distinct structures and intriguing electronic properties can be accessed by various physical and chemical approaches. Here, we report electrochemical lithium (Li) intercalation into 1T'-MoTe2 nanoflakes, le…
View article: Spontaneous Supercrystal Formation During a Strain‐Engineered Metal–Insulator Transition
Spontaneous Supercrystal Formation During a Strain‐Engineered Metal–Insulator Transition Open
Mott metal–insulator transitions possess electronic, magnetic, and structural degrees of freedom promising next‐generation energy‐efficient electronics. A previously unknown, hierarchically ordered, and anisotropic supercrystal state is re…
View article: Deep Learning of Structural Morphology Imaged by Scanning X-ray Diffraction Microscopy
Deep Learning of Structural Morphology Imaged by Scanning X-ray Diffraction Microscopy Open
Scanning X-ray nanodiffraction microscopy is a powerful technique for spatially resolving nanoscale structural morphologies by diffraction contrast. One of the critical challenges in experimental nanodiffraction data analysis is posed by t…
View article: Critical slowing of the spin and charge density wave order in thin film Cr following photoexcitation
Critical slowing of the spin and charge density wave order in thin film Cr following photoexcitation Open
We report on the evolution of the charge density wave (CDW) and spin density wave (SDW) orders of a chromium film following photoexcitation with an ultrafast optical laser pulse. The CDW is measured by ultrafast time-resolved x-ray diffrac…
View article: X-ray Nano-imaging of a Heterogeneous Structural Phase Transition in V2O3
X-ray Nano-imaging of a Heterogeneous Structural Phase Transition in V2O3 Open
Controlling the Mott transition through strain engineering is crucial for advancing the development and application of memristive and neuromorphic computing devices. Yet, Mott insulators are heterogeneous due to intrinsic phase boundaries …
View article: Unraveling the nature of quasi van der Waals Epitaxy of magnetic topological insulators Cr: (BixSb1-x)2Te3 on a GaAs (111) substrate through coherently strained interface
Unraveling the nature of quasi van der Waals Epitaxy of magnetic topological insulators Cr: (BixSb1-x)2Te3 on a GaAs (111) substrate through coherently strained interface Open
Quasi van der Waals Epitaxy (qvdWE) has been realized for decades at the interfaces between 3D and 2D materials or van der Waals materials. The growth of magnetic topological insulators (MTI) Cr: (BixSb1-x)2Te3 (CBST) on GaAs (111) substra…
View article: Critical slowing of the spin and charge density wave order in thin film Cr following photoexcitation
Critical slowing of the spin and charge density wave order in thin film Cr following photoexcitation Open
We report on the evolution of the charge density wave (CDW) and spin density wave (SDW) order of a chromium film following photoexcitation with an ultrafast optical laser pulse. The CDW is measured by ultrafast time-resolved x-ray diffract…
View article: <i>In Situ</i> and <i>Operando</i> X-ray Scattering Methods in Electrochemistry and Electrocatalysis
<i>In Situ</i> and <i>Operando</i> X-ray Scattering Methods in Electrochemistry and Electrocatalysis Open
Electrochemical and electrocatalytic processes are of key importance for the transition to a sustainable energy supply as well as for a wide variety of other technologically relevant fields. Further development of these processes requires …
View article: Operando real-space imaging of a structural phase transformation in a high-voltage electrode
Operando real-space imaging of a structural phase transformation in a high-voltage electrode Open
Discontinuous solid-solid phase transformations play a pivotal role in determining properties of rechargeable battery electrodes. By leveraging operando Bragg Coherent Diffractive Imaging (BCDI), we investigate the discontinuous phase tran…
View article: Spontaneous supercrystal formation during a strain-engineered metal-insulator transition
Spontaneous supercrystal formation during a strain-engineered metal-insulator transition Open
Mott metal-insulator transitions possess electronic, magnetic, and structural degrees of freedom promising next generation energy-efficient electronics. We report a previously unknown, hierarchically ordered state during a Mott transition …
View article: Multimodal Operando X-ray Mechanistic Studies of a Bimetallic Oxide Electrocatalyst in Alkaline Media
Multimodal Operando X-ray Mechanistic Studies of a Bimetallic Oxide Electrocatalyst in Alkaline Media Open
Furthering the understanding of the catalytic mechanisms in the oxygen reduction reaction (ORR) is critical to advancing and enabling fuel cell technology. In this work, we use multimodal operando synchrotron X-ray diffraction (XRD) and re…
View article: Absence of $3a_0$ Charge Density Wave Order in the Infinite Layer Nickelates
Absence of $3a_0$ Charge Density Wave Order in the Infinite Layer Nickelates Open
A hallmark of many unconventional superconductors is the presence of many-body interactions which give rise to broken symmetry states intertwined with superconductivity. Recent resonant soft x-ray scattering experiments report commensurate…
View article: Real-space imaging of periodic nanotextures in thin films via phasing of diffraction data
Real-space imaging of periodic nanotextures in thin films via phasing of diffraction data Open
New properties and exotic quantum phenomena can form due to periodic nanotextures, including Moire patterns, ferroic domains, and topologically protected magnetization and polarization textures. Despite the availability of powerful tools t…