Christoph K. Hofer
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View article: Investigating the convergence properties of iterative ptychography for atomic-resolution low-dose imaging
Investigating the convergence properties of iterative ptychography for atomic-resolution low-dose imaging Open
This study investigates the convergence properties of a collection of iterative electron ptychography methods, under low electron doses (<103e-/Å2) and gives particular attention to the impact of the user-d…
View article: Investigating the convergence properties of iterative ptychography for atomic-resolution low-dose imaging
Investigating the convergence properties of iterative ptychography for atomic-resolution low-dose imaging Open
This study investigates the convergence properties of a collection of iterative electron ptychography methods, under low electron doses ($<$ 10$^3$ $e^-/A^2$) and gives particular attention to the impact of the user-defined update strength…
View article: Regional anaesthesia-related complications in Switzerland
Regional anaesthesia-related complications in Switzerland Open
BACKGROUND Regional anaesthesia is widely used in clinical practice, offering significant benefits but carrying risks such as nerve damage and other complications. Understanding medicolegal trends associated with regional anaesthesia is es…
View article: Improving the low-dose performance of aberration correction in single sideband ptychography
Improving the low-dose performance of aberration correction in single sideband ptychography Open
The single sideband (SSB) framework of analytical electron ptychography can account for the presence of residual geometrical aberrations induced by the probe-forming lens. However, the accuracy of this aberration correction method is highl…
View article: Robust direction-dependent gain-calibration of beam-modelling errors far from the target field
Robust direction-dependent gain-calibration of beam-modelling errors far from the target field Open
Many astronomical questions require deep, wide-field observations at low radio frequencies. Phased arrays like LOFAR and SKA-low are designed for this, but have inherently unstable element gains, leading to time, frequency and direction-de…
View article: Detecting charge transfer at defects in 2D materials with electron ptychography
Detecting charge transfer at defects in 2D materials with electron ptychography Open
Electronic charge transfer at the atomic scale can reveal fundamental information about chemical bonding, but is far more challenging to directly image than the atomic structure. The charge density is dominated by the atomic nuclei, with b…
View article: SAFE anaesthesia for patients at risk of pulmonary aspiration
SAFE anaesthesia for patients at risk of pulmonary aspiration Open
BACKGROUND Clinical practice in patients at risk of pulmonary aspiration varies widely. However, data on actual management, decision-driving factors and controversial issues remain elusive. OBJECTIVE We aimed to comprehensively review the …
View article: Beyond the horizon: Quantifying the full sky foreground wedge in the cylindrical power spectrum
Beyond the horizon: Quantifying the full sky foreground wedge in the cylindrical power spectrum Open
One of the main obstacles preventing the detection of the redshifted 21 cm signal from neutral hydrogen in the early Universe is the astrophysical foreground emission, which is several orders of magnitude brighter than the signal. The fore…
View article: Deuxième liste Top 5 Anesthésiologie et médecine périopératoire
Deuxième liste Top 5 Anesthésiologie et médecine périopératoire Open
Deuxième liste Top 5 Anesthésiologie et médecine périopératoireRecommandations smarter medicine publie une deuxième liste Top 5 en collaboration avec la Société Suisse d' Anesthésiologie et de Médecine Périopératoire (SSAPM).Celle-ci énumè…
View article: Zweite Top-5-Liste Anästhesiologie und Perioperative Medizin
Zweite Top-5-Liste Anästhesiologie und Perioperative Medizin Open
View article: Phase offset method of ptychographic contrast reversal correction
Phase offset method of ptychographic contrast reversal correction Open
The contrast transfer function of direct ptychography methods such as the single side band (SSB) method are single signed, yet these methods still sometimes exhibit contrast reversals, most often where the projected potentials are strong. …
View article: Assessing Ptychographic Methods for Maximum Low Dose Performance
Assessing Ptychographic Methods for Maximum Low Dose Performance Open
View article: Near-Ideal Direct-Electron Focused-Probe 4D-STEM Data for Open-Source Phase Reconstructions
Near-Ideal Direct-Electron Focused-Probe 4D-STEM Data for Open-Source Phase Reconstructions Open
View article: Whole-Body Electrostatic Pain Treatment in Adults with Chronic Pain: A Prospective Multicentric Observational Clinical Trial
Whole-Body Electrostatic Pain Treatment in Adults with Chronic Pain: A Prospective Multicentric Observational Clinical Trial Open
View article: On central focusing for contrast optimization in direct electron ptychography of thick samples
On central focusing for contrast optimization in direct electron ptychography of thick samples Open
Ptychography provides high dose efficiency images that can reveal light elements next to heavy atoms. However, despite ptychography having an otherwise single signed contrast transfer function, contrast reversals can occur when the project…
View article: Reliable phase quantification in focused probe electron ptychography of thin materials
Reliable phase quantification in focused probe electron ptychography of thin materials Open
Electron ptychography provides highly sensitive, dose efficient phase images which can be corrected for aberrations after the data has been acquired. This is crucial when very precise quantification is required, such as with sensitivity to…
View article: Reliable phase quantification in focused probe electron ptychography of thin materials
Reliable phase quantification in focused probe electron ptychography of thin materials Open
Electron ptychography provides highly sensitive, dose efficient phase images which can be corrected for aberrations after the data has been acquired. This is crucial when very precise quantification is required, such as with sensitivity to…
View article: On central focusing for contrast optimization in direct electron ptychography of thick samples
On central focusing for contrast optimization in direct electron ptychography of thick samples Open
Ptychography provides high dose efficiency images that can reveal light elements next to heavy atoms. However, despite ptychography having an otherwise single signed contrast transfer function, contrast reversals can occur when the project…
View article: Picometer-precision few-tilt ptychotomography of 2D materials
Picometer-precision few-tilt ptychotomography of 2D materials Open
From ripples to defects, edges and grain boundaries, the 3D atomic structure of 2D materials is critical to their properties. However the damage inflicted by conventional 3D analysis precludes its use with fragile 2D materials, particularl…
View article: Detecting charge transfer at defects in 2D materials with electron ptychography
Detecting charge transfer at defects in 2D materials with electron ptychography Open
Electronic charge transfer at the atomic scale can reveal fundamental information about chemical bonding, but is far more challenging to directly image than the atomic structure. The charge density is dominated by the atomic nuclei, with b…
View article: Overcoming contrast reversals in focused probe ptychography of thick materials: An optimal pipeline for efficiently determining local atomic structure in materials science
Overcoming contrast reversals in focused probe ptychography of thick materials: An optimal pipeline for efficiently determining local atomic structure in materials science Open
Ptychography provides highly efficient imaging in scanning transmission electron microscopy (STEM), but questions have remained over its applicability to strongly scattering samples such as those most commonly seen in materials science. Al…
View article: Overcoming contrast reversals in focused probe ptychography of thick materials: an optimal pipeline for efficiently determining local atomic structure in materials science
Overcoming contrast reversals in focused probe ptychography of thick materials: an optimal pipeline for efficiently determining local atomic structure in materials science Open
Files concerning the publication "Overcoming contrast reversals in focused probe ptychography of thick materials: an optimal pipeline for efficiently determining local atomic structure in materials science"(arxiv:2205.13308 )
View article: Overcoming contrast reversals in focused probe ptychography of thick materials: an optimal pipeline for efficiently determining local atomic structure in materials science
Overcoming contrast reversals in focused probe ptychography of thick materials: an optimal pipeline for efficiently determining local atomic structure in materials science Open
Files concerning the publication "Overcoming contrast reversals in focused probe ptychography of thick materials: an optimal pipeline for efficiently determining local atomic structure in materials science"(arxiv:2205.13308 )
View article: Overcoming contrast reversals in focused probe ptychography of thick materials: an optimal pipeline for efficiently determining local atomic structure in materials science
Overcoming contrast reversals in focused probe ptychography of thick materials: an optimal pipeline for efficiently determining local atomic structure in materials science Open
Files concerning the publication "Overcoming contrast reversals in focused probe ptychography of thick materials: an optimal pipeline for efficiently determining local atomic structure in materials science"(arxiv:2205.13308 )
View article: Addressing Thickness Induced Contrast Reversals in Focused Probe Ptychography
Addressing Thickness Induced Contrast Reversals in Focused Probe Ptychography Open
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View article: Aligned Stacking of Nanopatterned 2D Materials for High-Resolution 3D Device Fabrication
Aligned Stacking of Nanopatterned 2D Materials for High-Resolution 3D Device Fabrication Open
Two-dimensional materials can be combined by placing individual layers on top of each other, so that they are bound only by their van der Waals interaction. The sequence of layers can be chosen arbitrarily, enabling an essentially atomic-l…
View article: Toward Exotic Layered Materials: 2D Cuprous Iodide
Toward Exotic Layered Materials: 2D Cuprous Iodide Open
Heterostructures composed of 2D materials are already opening many new possibilities in such fields of technology as electronics and magnonics, but far more could be achieved if the number and diversity of 2D materials were increased. So f…
View article: Event driven 4D STEM acquisition with a Timepix3 detector: Microsecond dwell time and faster scans for high precision and low dose applications
Event driven 4D STEM acquisition with a Timepix3 detector: Microsecond dwell time and faster scans for high precision and low dose applications Open
View article: Aligned Stacking of Nanopatterned 2D materials -- Towards 3D printing at atomic resolution
Aligned Stacking of Nanopatterned 2D materials -- Towards 3D printing at atomic resolution Open
Two-dimensional materials can be combined by placing individual layers on top of each other, so that they are bound only by their van der Waals interaction. The sequence of layers can be chosen arbitrarily, enabling an essentially atomic-l…
View article: Towards Exotic Layered Materials: 2D Cuprous Iodide
Towards Exotic Layered Materials: 2D Cuprous Iodide Open
Heterostructures composed of two-dimensional (2D) materials are already opening many new possibilities in such fields of technology as electronics and magnonics, but far more could be achieved if the number and diversity of 2D materials is…