Electron spin resonance spectroscopy in a transmission electron microscope

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Limited-angle electron tomography (ET) aims to reconstruct 3D shapes from 2D projections of transmission electron microscopy (TEM) within a restricted range and number of tilting angles, but it suffers from the missing-edge problem that causes severe reconstruction artefacts. Deep learning approaches have shown promising results in alleviating these artefacts, yet they typically require large high-quality training datasets with known 3D ground truth, which are difficult to obtain in electron microscopy. To

Strong magnetic fields applied to metals confine electrons into Landau orbits, except at the boundaries at which frequent surface collisions disrupt their cyclotron motion. In two-dimensional systems, these boundary states form dissipationless chiral edge channels in the quantum Hall regime. By contrast, the quantum limit of three-dimensional (3D) metals is traditionally thought to differ fundamentally and instead contains gapless Landau bands, lacking quantized Hall conductance or dissipationless transport

Phase retrieval is a nonlinear inverse problem that arises in a wide range of imaging modalities, from electron microscopy to Fourier ptychography. In particular, the reconstruction is facilitated when the sensing matrix is i.i.d. random, enabling strong theoretical guarantees and efficient reconstruction algorithms. However, its applicability is restricted by excessive computational costs. In this paper, we propose structured random models for phase retrieval, where we emulate a dense random matrix by a ca

The unique properties of transition metal dichalcogenides provide a versatile platform for scalable, room-temperature quantum devices. Their future commercialization will inevitably depend on the development of heterostructures facilitating charge injection into pre-defined areas of 2D components. We showcase here an innovative approach to accurately characterize electrically active nanoscale regions in multidimensional heterostructures made of WSe₂ layers and GaAs, thin films and in-plane one-dimensional n

An apparatus for observing dynamic systems by time-resolved microscopy has an optical microscope including a cryo stage for receiving a cryo sample and maintaining the cryo sample at a cryogenic temperature, a heating system configured to temporarily heat at least a portion of the cryo sample such that the portion of the cryo sample melts to a liquid state, temporarily resides in the liquid state, and then revitrifies, and an image detector associated with the optical microscope for detecting magnified imag

We have recently introduced a novel approach to time-resolved cryo-electron microscopy (cryo-EM) that affords microsecond time resolution. It involves melting a cryo sample with a laser beam to allow dynamics of the embedded particles to occur. Once the laser beam is switched off, the sample revitrifies within just a few microseconds, trapping the particles in their transient configurations, which can subsequently be imaged to obtain a snap shot of the dynamics at this point in time. While we have previousl

Measurements of particle properties with unprecedented accuracy in the Future Circular Collider e⁺e⁻ (FCC-ee) are reliant on the high precision center-of-mass energy calibration, which could be realized via resonant depolarization measurements. The obtainable equilibrium spin polarization levels under the influence of lattice imperfections should be estimated via spin polarization simulations. An early-stage exploration of spin simulations in the FCC-ee has been conducted using Bmad. An effective model has

Ion Accoustic Wave (IAW) dynamics are usually simulated assuming an isothermal Boltzmann ﬂuid response of the electrons. It has been shown that results from the Boltzmann model may signiﬁcantly diﬀer from cor- responding ones obtained considering the fully kinetic electron dynamics, in particular wrt. the non-linear instability mechanisms of ﬁnite amplitude IAWs [1]. For ZTe /Ti 10 (Z the ionization degree and Te/i the electron/ion temperature), the positive contribution from trapped electrons to the non- l

The swelling and compressive mechanical behavior as well as the morphology and biocompatibility of composite hydrogels based on Tween® 20 trimethacrylate (T3), N-vinyl-2-pyrrolidone (NVP) and nanofibrillated cellulose (NFC) were assessed in the present study. The chemical structure of T3 was verified by Fourier transform infrared spectroscopy and proton nuclear magnetic resonance, and the degree of substitution was found to be around 3. Swelling ratios of neat hydrogels composed of different concentrations

Recently, the dynamics of atomic distances and orbital charge in graphite has been investigated by ultra-fast electron diffraction, electron energy loss spectroscopy and transient optical absorption. A subtle interplay between structural motions and electronic degrees of freedom was found responsible for several peculiar behaviors like coherent phonon emission, photoinduced diamond formation, and graphene ablation. Here, we calculate ab initio the charge density of graphite, and observe its evolution during

A detailed structural analysis of the surface supported self-assembly of terphenyl-4,4′′-dicarbonitrile molecules (NC−Ph3−CN) linked by Co adatoms on Ag(111) reveals different surface patterns depending on the constraints applied to the system. Without constraints, i.e., sufficient mobility and absence of space limitations at the surface, extended regular honeycomb nanomeshes are formed. On the basis of high-resolution scanning tunneling microscopy images, an atomistic model is derived showing the crystallo

Patterned magnetic thin films are of interest due to the potential for new technological applications and also because of their modified physical behaviour as the lateral dimensions are reduced. The functionality of patterned films can be intelligently designed by combining materials with different magnetic properties. In particular, bilayers comprising a magnetically hard and a magnetically soft film (often referred to as exchange-spring systems) provide useful model systems for optimization of exchange-co

Cantilever-based detection of ultrasmall forces is of great interest for several applications such as magnetic resonance force miscroscopy (MRFM) where an ultrahigh sensitive cantilever is used to detect magnetic resonance in small ensembles of electron or nuclear spins. Detecting the smallest possible forces requires ultrahigh sensitive cantilevers with low spring constant (k < 0.1 mN/m), resonance frequency f > 1 kHz and high quality factor (Q > 30000 in vacuum). Considerable progress has been made in fab

Smart packaging concept has been the driving force for the search of advanced technologies to produce multi-functional micro-scale devices for long years. In this sense, LTCC technology has been recently addressed as the suitable choice for a wide range of applications. In addition to its attractive characteristics for high-frequency applications those have been profited for a long time, it receives a growing attention for sensor applications in the recent years as well. This is due to the easy machinabilit

A novel NMR method characterizes slow motions in proteins by multiple refocusing of double- and zero-quantum coherences of amide protons and nitrogen-15 nuclei. If both nuclei experience changes in their isotropic chem. shifts because of internal motions on slow time scales (ms-ms), this leads to a difference in the relaxation rates of double- and zero-quantum coherences. This is due to CSM/CSM (chem. shift modulation) cross-correlation effects that are related to the well-known chem. exchange contribution

The advent of scanning near-field optical microscopy (SNOM) has augmented at a microscopic level the usefulness of optical spectroscopy in the region between 300 nm and 10 mum. Two-dimensional imaging of chemical constituents makes this a very attractive and powerful new approach. In this paper we show SNOM results obtained in several geometrical configurations on boron clusters in silicon, Li clusters embedded in a LiF sample and BN growth on silicon. We also show some results on the wavelength dependence

Scanning capacitance microscopy and electrostatic force microscopy have been used to characterize commercial semiconductor devices at various stages of the fabrication process. These methods, combined with conventional atomic force microscopy, allow to visualize qualitatively the oxide thickness, the nature of dopants and the exact position of implanted areas. (C) 2002 Elsevier Science Ltd. All rights reserved.

The magnetic resonance at 41 meV observed in neutron scattering studies of YBa2Cu3O7 holds a key position in the understanding of high-T-c, superconductivity. Within the SO(5) model for superconductivity and antiferromagnetism, we have calculated the effect of an applied magnetic field on the neutron scattering cross section of the magnetic resonance. In the presence of Abrikosov vortices, the neutron scattering cross section shows clear signatures of not only the fluctuations in the superconducting order p

Irradiated 304 and 316 stainless steel samples were investigated. The steels were neutron irradiated to 1.5 and 7.5 dpa at 550 K. Similar types of steels were irradiated at 550 K with 590 MeV protons in the PIREX facility at PSI, Switzerland. The doses reached in this case were 0.15 and 0.3 dpa. The stress-strain relationships at different temperatures were measured. The irradiation and deformation microstructures were investigated using transmission electron microscopy (TEM). Two modes of deformation were

The temperature-dependent damping of quantum-mechanical interference patterns from surface-state electrons scattering off steps on Ag(111) and Cu(111) has been studied using scanning tunneling microscopy (STM) and spectroscopy in the temperature range 3,5-178 K. The thermal damping of the electron standing waves is described quantitatively within a simple plane-wave model accounting for thermal broadening due to the broadening of the Fermi-Dirac distributions of sample and tip, for beating effects between e

Electron spin resonance spectroscopy in a transmission electron microscope

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Limited-angle tomography reconstruction via projector guided 3D diffusion

Transport evidence for chiral surface states from three-dimensional Landau bands

Structured Random Models for Phase Retrieval with Optical Diffusers

Visualizing nanoscale charge flows in multi-dimensional WSe2/GaAs vertical diodes

Microsecond melting and revitrification of cryo samples with a correlative light electron microscopy setup

Microsecond melting and revitrification of cryo samples with a correlative light-electron microscopy approach

Spin Polarization Simulations for the Future Circular Collider e⁺e⁻ using BMAD

Reduced Electron Model with Accurate Trapping Effects for Non-Linear Ion Accoustic Waves

Nanofibrillated cellulose composite hydrogel for the replacement of the nucleus pulposus

The interplay between structure and orbitals in the chemical bonding of graphite

Surface-Confined Metal?Organic Nanostructures from Co-Directed Assembly of Linear Terphenyl-dicarbonitrile Linkers on Ag(111)

Permalloy thin films exchange-coupled to arrays of stencilled cobalt islands

Combined Al-protection and HF-vapour release process for ultrathin cantilevers

Structuration of micro-fluidic devices based on low temperature co-fired ceramic (LTCC) technology

Evidence for slow motion in proteins by multiple refocusing of heteronuclear nitrogen/proton multiple quantum coherences in NMR

Optical nanospectroscopy applications in material science

Use of scanning capacitance microscopy for controlling wafer processing

Magnetic neutron scattering resonance of high-T-c superconductors in external magnetic fields: An SO(5) study

The effects of irradiation and testing temperature on tensile behaviour of stainless steels

Thermal damping of quantum interference patterns of surface-state electrons