Publications (27)
Multimodal Operando X-ray Mechanistic Studies of a Bimetallic Oxide Electrocatalyst in Alkaline Media
Jason J. Huang, Yao Yang, Daniel Weinstock +5
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 mul…
Real-space imaging of polar and elastic nano-textures in thin films via inversion of diffraction data
Ziming Shao, Noah Schnitzer, Jacob Ruf +13
Exploiting the emerging nanoscale periodicities in epitaxial, single-crystal thin films is an exciting direction in quantum materials science: confinement and periodic distortions…
Anisotropic Superconductivity with Enhanced Critical Field in Strained RuO2
Younes Ghorbani, Samuel Poage, Xuehsi Gao +9
The superconductivity in RuO2 emerges under strain. RuO2 is also an altermagnet candidate. The nature of superconductivity and its relation with neighboring orders, however, are no…
Picosecond expansion in LaAlO3 resonantly driven by infrared-active phonons
Jakob Gollwitzer, Jeffrey Z. Kaaret, Y. Eren Suyolcu +19
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 latt…
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
Yuxing Ren, Lixuan Tai, Kaicheng Pan +14
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 insul…
In-situ non-equilibrium nanomechanics in a proton-conducting ceramic at low temperatures
Oleg Yu. Gorobtsov, Yumeng Song, Kevin Fritz +6
Nanostructured proton-conducting ceramics (PCCs) have attracted considerable interest as moderate-temperature proton conductors. Structure dynamics during proton conduction, partic…
Scientific Opportunities with an X-ray Free-Electron Laser Oscillator
Bernhard Adams, Gabriel Aeppli, Thomas Allison +47
An X-ray free-electron laser oscillator (XFELO) is a new type of hard X-ray source that would produce fully coherent pulses with meV bandwidth and stable intensity. The XFELO compl…
Limit on sterile neutrino contribution from the Mainz Neutrino Mass Experiment
Christine Kraus, Andrej Singer, Kathrin Valerius +1
The recent analysis of the normalization of reactor antineutrino data, the calibration data of solar neutrino experiments using gallium targets, and the results from the neutrino o…
Critical slowing of the spin and charge density wave order in thin film Cr following photoexcitation
Sheena K. K. Patel, Oleg Yu. Gorobtsov, Devin Cela +11
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. Th…
Non-equilibrium phase precursors to the insulator-metal transition in V2O3
Andrej Singer, Juan Gabriel Ramirez, Ilya Valmianski +11
The discovery of novel phases of matter is at the core of modern physics. In quantum materials, subtle variations in atomic-scale interactions can induce dramatic changes in macros…
Synthesis of epitaxial TaO thin films on AlO by suboxide molecular-beam epitaxy and thermal laser epitaxy
Yorick A. Birkhölzer, Anna S. Park, Noah Schnitzer +28
Tantalum dioxide (TaO2) is a metastable tantalum compound. Here, we report the epitaxial stabilization of TaO2 on Al2O3 (1-102) (r-plane sapphire) substrates using suboxide molecul…
Phonon-assisted formation of an itinerant electronic density wave
Jiaruo Li, Oleg Yu. Gorobtsov, Sheena K. K. Patel +13
Electronic instabilities drive ordering transitions in condensed matter. Despite many advances in the microscopic understanding of the ordered states, a more nuanced and profound q…
Disorder Dynamics in Battery Nanoparticles During Phase Transitions Revealed by Operando Single-Particle Diffraction
Jason Huang, Daniel Weinstock, Hayley Hirsh +9
Structural and ion-ordering phase transitions limit the viability of sodium-ion intercalation materials in grid scale battery storage by reducing their lifetime. However, the combi…
Structure-selective operando x-ray spectroscopy
Daniel Weinstock, Hayley S. Hirsh, Oleg Yu. Gorobtsov +6
The relationship between charge and structure dictates the properties of electrochemical systems. For example, reversible Na-ion intercalation - a low-cost alternative to Li-ion te…
Femtosecond laser produced periodic plasma in a colloidal crystal probed by XFEL radiation
Nastasia Mukharamova, Sergey Lazarev, Janne-Mieke Meijer +20
With the rapid development of short-pulse intense laser sources, studies of matter under extreme irradiation conditions enter further unexplored regimes. In addition, an applicatio…
Martensitic laminate geometry controls electronic phase transitions in a Mott insulator
Ziming Shao, Benjamin Gregory, Suchismita Sarker +4
Symmetry-lowering structural phase transitions result in multiple degenerate structures whose coexistence is determined by macroscopic strain compatibility. In quantum materials, t…
Deep Learning of Structural Morphology Imaged by Scanning X-ray Diffraction Microscopy
Aileen Luo, Tao Zhou, Martin V. Holt +2
Scanning X-ray nanodiffraction microscopy is a powerful technique for spatially resolving nanoscale structural morphologies by diffraction contrast. One of the critical challenges…
Resonant diffraction and photoemission inconsistent with altermagnetism in epitaxial RuO films
Benjamin Z. Gregory, Neha Wadehra, Shuyuan Zhang +15
Excitement about the magnetic and electronic properties of RuO is growing, fueled by reports of antiferromagnetism, strain-induced superconductivity, and its recent classificat…
Modelling of partially coherent radiation based on the coherent mode decomposition
Andrej Singer, Ivan A. Vartanyants
We present a method for the propagation of partially coherent radiation using coherent mode decomposition and wavefront propagation. The radiation field is decomposed into a sum of…
Picosecond volume expansion drives a later-time insulator-metal transition in a nano-textured Mott Insulator
Anita Verma, Denis Golež, Oleg Yu. Gorobtsov +24
Technology moves towards ever faster switching between different electronic and magnetic states of matter. Manipulating properties at terahertz rates requires accessing the intrins…
X-ray Nano-imaging of Defects in Thin Film Catalysts via Cluster Analysis
Aileen Luo, Oleg Yu. Gorobtsov, Jocienne N. Nelson +9
Functional properties of transition-metal oxides strongly depend on crystallographic defects. In transition-metal-oxide electrocatalysts such as SrIrO3 (SIO), crystallographic latt…
Strain-induced orbital energy shift in antiferromagnetic RuO2 revealed by resonant elastic x-ray scattering
Benjamin Gregory, Jörg Strempfer, Daniel Weinstock +7
In its ground state, RuO2 was long thought to be an ordinary metallic paramagnet. Recent neutron and x-ray diffraction revealed that bulk RuO2 is an antiferromagnet (AFM) with TN a…
DONUT: Physics-aware Machine Learning for Real-time X-ray Nanodiffraction Analysis
Aileen Luo, Tao Zhou, Ming Du +3
Coherent X-ray scattering techniques are critical for investigating the fundamental structural properties of materials at the nanoscale. While advancements have made these experime…
X-ray Nano-imaging of a Heterogeneous Structural Phase Transition in V2O3
Ziming Shao, Aileen Luo, Eti Barazani +5
Controlling the Mott transition through strain engineering is crucial for advancing the development and application of memristive and neuromorphic computing devices. Yet, Mott insu…
An algorithm for Bragg coherent X-ray diffractive imaging of highly strained nanocrystals
Ziyi Wang, Oleg Gorobtsov, Andrej Singer
By using phase retrieval, Bragg Coherent Diffractive Imaging (BCDI) allows tracking of three-dimensional displacement fields inside individual nanocrystals. Nevertheless, in the pr…
Crystallography of periodic nanotextures in a strained Mott insulator
Benjamin Z. Gregory, Yorick A. Birkhölzer, Noah Schnitzer +9
Here we investigate stripes of alternating structural phases spontaneously forming in epitaxially strained thin films below the metal-insulator transition. Using large-…
Operando real-space imaging of a structural phase transformation in a high-voltage electrode
Yifei Sun, Sunny Hy, Nelson Hua +5
Discontinuous solid-solid phase transformations play a pivotal role in determining properties of rechargeable battery electrodes. By leveraging operando Bragg Coherent Diffractive…