370 citations · 2.1k across the 44 of their papers we have counts for
47 papers
(Sub)nanoscale Visualization of Reconstruction-Driven Moiré Exciton Localization and Delocalization
Medha Dandu, Sriram Sankar, Giovanny Espitia +12
Spectral fingerprints in optical absorption and emission have typically been used as a signature of exciton localization in twisted moiré bilayers. However, the mechanism by which…
Crystal nucleation and growth in high-entropy alloys revealed by atomic electron tomography
Yakun Yuan, Saman Moniri, Yao Yang +8
High-entropy alloys (HEAs) balance mixing entropy and intermetallic phase formation enthalpy, creating a vast compositional space for structural and functional materials (1-6). The…
Streaming Large-Scale Electron Microscopy Data to a Supercomputing Facility
Samuel S. Welborn, Chris Harris, Stephanie M. Ribet +4
Data management is a critical component of modern experimental workflows. As data generation rates increase, transferring data from acquisition servers to processing servers via co…
Mapping electron beam-induced radiolytic damage in molecular crystals
Ambarneil Saha, Matthew Mecklenburg, Alexander J. Pattison +3
Every electron crystallography experiment is fundamentally limited by radiation damage. Nevertheless, little is known about the onset and progression of radiolysis in beam-sensitiv…
Accelerating Time-to-Science by Streaming Detector Data Directly into Perlmutter Compute Nodes
Samuel S. Welborn, Bjoern Enders, Chris Harris +2
Recent advancements in detector technology have significantly increased the size and complexity of experimental data, and high-performance computing (HPC) provides a path towards m…
Uncovering the Three-Dimensional Structure of Upconverting Core-Shell Nanoparticles with Multislice Electron Ptychography
Stephanie M. Ribet, Georgios Varnavides, Cassio C. S. Pedroso +4
In photon upconverting core-shell nanoparticles, structure strongly dictates performance. Conventional imaging in scanning transmission electron microscopy has sufficient resolutio…
Three-dimensional atomic positions and local chemical order of medium- and high-entropy alloys
Saman Moniri, Yao Yang, Yakun Yuan +9
Medium- and high-entropy alloys (M/HEAs) mix multiple principal elements with near-equiatomic composition and represent a paradigm-shift strategy for designing new materials for me…
The 4D Camera: an 87 kHz direct electron detector for scanning/transmission electron microscopy
Peter Ercius, Ian J. Johnson, Philipp Pelz +19
We describe the development, operation, and application of the 4D Camera -- a 576 by 576 pixel active pixel sensor for scanning/transmission electron microscopy which operates at 8…
Imaging 3D Chemistry at 1 nm Resolution with Fused Multi-Modal Electron Tomography
Jonathan Schwartz, Zichao Wendy Di, Yi Jiang +15
Measuring the three-dimensional (3D) distribution of chemistry in nanoscale matter is a longstanding challenge for metrological science. The inelastic scattering events required fo…
Advanced Techniques in Automated High Resolution Scanning Transmission Electron Microscopy
Alexander Pattison, Cassio C. S. Pedroso, Bruce E. Cohen +4
Scanning transmission electron microscopy is a common tool used to study the atomic structure of materials. It is an inherently multimodal tool allowing for the simultaneous acquis…
Imaging the electron charge density in monolayer MoS2 at the Ångstrom scale
Joel Martis, Sandhya Susarla, Archith Rayabharam +15
Four-dimensional scanning transmission electron microscopy (4D-STEM) has recently gained widespread attention for its ability to image atomic electric fields with sub-Ångstrom spat…
Indefinite and Bidirectional Near Infrared Nanocrystal Photoswitching
Changhwan Lee, Emma Z. Xu, Kevin W. C. Kwock +14
Materials whose luminescence can be switched by optical stimulation drive technologies ranging from superresolution imaging1-4, nanophotonics5, and optical data storage6-8, to targ…
Real-time 3D analysis during electron tomography using tomviz
Jonathan Schwartz, Chris Harris, Jacob Pietryga +13
The demand for high-throughput electron tomography is rapidly increasing in biological and material sciences. However, this 3D imaging technique is computationally bottlenecked by…
Hyperspectral imaging of excitons within a moiré unit-cell with a sub-nanometer electron probe
Sandhya Susarla, Mit H. Naik, Daria D. Blach +9
Electronic and optical excitations in two-dimensional moiré systems are uniquely sensitive to local atomic registries, leading to materials- and twist-angle specific correlated ele…
Strong structural and electronic coupling in metavalent PbS moire superlattices
Yu Wang, Zhigang Song, Jiawei Wan +7
Moire superlattices are twisted bilayer materials, in which the tunable interlayer quantum confinement offers access to new physics and novel device functionalities. Previously, mo…
Revealing 3-dimensional core-shell interface structures at the single-atom level
Hyesung Jo, Dae Han Wi, Taegu Lee +12
Nanomaterials with core-shell architectures are prominent examples of strain-engineered materials, where material properties can be designed by fine-tuning the misfit strain at the…
Solving Complex Nanostructures With Ptychographic Atomic Electron Tomography
Philipp M Pelz, Sinead Griffin, Scott Stonemeyer +6
Transmission electron microscopy (TEM) is a potent technique for the determination of three-dimensional atomic scale structure of samples in structural biology and materials scienc…
Symmetry-Breaking and Self-Sorting in Block Copolymer-based Multicomponent Nanocomposites
Le Ma, Hejin Huang, Peter Ercius +2
Co-assembly of inorganic nanoparticles (NPs) and nanostructured polymer matrix represents an intricate interplay of enthalpic or entropic forces. Particle size largely affects the…
Deep Learning Coherent Diffractive Imaging
Dillan J. Chang, Colum M. O'Leary, Cong Su +5
We report the development of deep learning coherent electron diffractive imaging at sub-angstrom resolution using convolutional neural networks (CNNs) trained with only simulated d…
Hard ferromagnetism down to the thinnest limit of iron-intercalated tantalum disulfide
Samra Husremović, Katherine Inzani, Catherine K. Groschner +11
Two-dimensional (2D) magnetic crystals hold promise for miniaturized and ultralow power electronic devices that exploit spin manipulation. In these materials, large, controllable m…
Pervasive beyond room-temperature ferromagnetism in a doped van der Waals magnet: Ni doped FeGeTe with up to 478 K
Xiang Chen, Yu-Tsun Shao, Rui Chen +10
The existence of long range magnetic order in low dimensional magnetic systems, such as the quasi-two-dimensional (2D) van der Waals (vdW) magnets, has attracted intensive studies…
Atomic-scale identification of the active sites of nanocatalysts
Yao Yang, Jihan Zhou, Zipeng Zhao +15
Alloy nanocatalysts have found broad applications ranging from fuel cells to catalytic converters and hydrogenation reactions. Despite extensive studies, identifying the active sit…
Multi-scale characterization of hexagonal Si-4H: a hierarchical nanostructured material
Silvia Pandolfi, Shiteng Zhao, John Turner +9
In this work we present a detailed structural characterization of Si-4H, a newly discovered bulk form of hexagonal silicon (Si) with potential optoelectronic applications. Using mu…
A room temperature polar ferromagnetic metal
Hongrui Zhang, Yu-Tsun Shao, Rui Chen +15
The advent of long-range magnetic order in non-centrosymmetric compounds has stimulated interest in the possibility of exotic spin transport phenomena and topologically protected s…