Browsing Physics (Scholarly Publications) by Author "Jones, Lewys"
Now showing items 1-16 of 16
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Correcting for probe wandering by precession path segmentation
Jones, Lewys (2023)Precession electron diffraction has in the past few decades become a powerful technique for structure solving, strain analysis, and orientation mapping, to name a few. One of the benefits of precessing the electron beam, ... -
Cost & Capability Compromises in STEM Instrumentation for Low-Voltage Imaging
Jones, Lewys (2022)When characterising beam-sensitive materials in the scanning transmission electron microscope (STEM), low- dose techniques are essential for the reliable observation of samples in their true state. A simple route to minimise ... -
Development of a Practicable Digital Pulse Read-Out for Dark-Field STEM
Jones, Lewys (2021)When characterising beam-sensitive materials in the scanning transmission electron microscope (STEM), low- dose techniques are essential for the reliable observation of samples in their true state. A simple route to minimise ... -
Direct Imaging of Charge Redistribution due to Bonding at Atomic Resolution via Electron Ptychography
Jones, Lewys (2019)Phase imaging in electron microscopy is sensitive to the local potential including charge redistribution from bonding. We demonstrate that electron ptychography provides the necessary sensitivity to detect this subtle ... -
Experimental reconstructions of 3D atomic structures from electron microscopy images using a Bayesian genetic algorithm
Jones, Lewys (2022)We introduce a Bayesian genetic algorithm for reconstructing atomic models of monotype crystalline nanoparticles from a single projection using Z-contrast imaging. The number of atoms in a projected atomic column obtained ... -
Increasing Spatial Fidelity and SNR of 4D-STEM using Multi-frame Data Fusion
Jones, Lewys (2021)4D-STEM, in which the 2D diffraction plane is captured for each 2D scan position in the scanning transmission electron microscope (STEM) using a pixelated detector, is complementing, and increasingly replacing existing ... -
Machine-learning approach for quantified resolvability enhancement of low-dose STEM data
Sanvito, Stefano; Jones, Lewys (2023)High-resolution electron microscopy is achievable only when a high electron dose is employed, a practice that may cause damage to the specimen and, in general, affects the observation. This drawback sets some limitations ... -
Measuring Dynamic Structural Changes of Nanoparticles at the Atomic Scale Using Scanning Transmission Electron Microscopy
Jones, Lewys (2020)We propose a new method to measure atomic scale dynamics of nanoparticles from experimental high-resolution annular dark field scanning transmission electron microscopy images. By using the so-called hidden Markov model, ... -
Prismatic 2.0 Simulation software for scanning and high resolution transmission electron microscopy (STEM and HRTEM)
Mcbean, Patrick; Jones, Lewys (2021)Scanning transmission electron microscopy (STEM), where a converged electron probe is scanned over a sample's surface and an imaging, diffraction, or spectroscopic signal is measured as a function of probe position, is an ... -
Probing the Dynamics of Topologically Protected Charged Ferroelectric Domain Walls with the Electron Beam at the Atomic Scale
Jones, Lewys (2020)Dynamic charged ferroelectric domain walls (CDWs) overturn the classical idea that our electronic circuits need to consist of fixed components of hardware.[1,2] With their own unique electronic properties and exotic ... -
Procedure for 3D atomic resolution reconstructions using atom-counting and a Bayesian genetic algorithm
Jones, Lewys (2021)We introduce a Bayesian genetic algorithm for reconstructing atomic models of nanoparticles from a single projection using Z-contrast imaging. The number of atoms in a projected atomic column obtained from annular dark ... -
Prospect for detecting magnetism of a single impurity atom using electron magnetic chiral dichroism
Jones, Lewys (American Physical Society, 2019)Dopants, even single atoms, can influence the electrical and magnetic properties of materials. Here we demonstrate the opportunity for detecting the magnetic response of an embedded magnetic impurity in a nonmagnetic host ... -
Self-Assembly of Atomically Thin Chiral Copper Heterostructures Templated by Black Phosphorus
Coleman, Jonathan; Sanvito, Stefano; Nicolosi, Valeria; Jones, Lewys (2019)The fabrication of 2D systems for electronic devices is not straightforward, with top‐down low‐yield methods often employed leading to irregular nanostructures and lower quality devices. Here, a simple and reproducible ... -
Towards data-driven next-generation transmission electron microscopy
Jones, Lewys (2020)Electron microscopy touches on nearly every aspect of modern life, underpinning materials development for quantum computing, energy and medicine. We discuss the open, highly integrated and data-driven microscopy architecture ... -
Unlocking the Origin of Compositional Fluctuations in InGaN Light Emitting Diodes
Jones, Lewys (2021)The accurate determination of compositional fluctuations is pivotal in understanding their role in the reduction of efficiency in high indium content InxGa1–xN light emitting diodes (LEDs), the origin of which is still ... -
Using Your Beam Efficiently: Reducing Electron Dose in the STEM via Flyback Compensation
Jones, Lewys; Mullarkey, Tiarnan; Peters, Jonathan J. P.; Downing, Clive (2022)In the scanning transmission electron microscope, fast-scanning and frame-averaging are two widely used approaches for reducing electron-beam damage and increasing image signal noise ratio which require no additional ...