106 citations · 609 across the 27 of their papers we have counts for
27 papers
Simulating Microwave-Controlled Spin Imaging with Free-Space Electrons
Santiago Beltrán-Romero, Stefan Löffler, Dennis Rätzel +1
Coherent spin resonance techniques, such as nuclear and electron spin resonance spectroscopy, have revolutionized non-invasive imaging by providing spectrally resolved information…
Entanglement in Elastic Electron Scattering: Perturbation theory misses fundamental aspects of Bragg scattering
Stefan Löffler, Peter Schattschneider
Elastic electron scattering is one of the primary means of investigating materials on the atomic scale. It is usually described in a one-particle approach (the probe electron's evo…
Visualising emergent phenomena at oxide interfaces
Michael Oberaigner, Manuel Ederer, Sandeep Kumar Chaluvadi +5
Knowledge of atomic-level details of structure, chemistry, and electronic states is paramount for a comprehensive understanding of emergent properties at oxide interfaces. We utili…
Optimizing Experimental Parameters for Orbital Mapping
Manuel Ederer, Stefan Löffler
A new material characterization technique is emerging for the transmission electron microscope (TEM). Using electron energy-loss spectroscopy, real space mappings of the underlying…
A quantum logic gate for free electrons
Stefan Löffler, Thomas Schachinger, Peter Hartel +6
The topological charge of vortex electrons spans an infinite-dimensional Hilbert space. Selecting a two-dimensional subspace spanned by , a beam electron in a transmis…
Image Difference Metrics for High-Resolution Electron Microscopy
Manuel Ederer, Stefan Löffler
Digital image comparison and matching brings many advantages over the traditional subjective human comparison, including speed and reproducibility. Despite the existence of an abun…
Direct mapping of electronic orbitals in graphene using electron energy-loss spectroscopy
M. Bugnet, M. Ederer, V. K. Lazarov +4
The spatial distributions of anti-bonding and states in epitaxial graphene multilayers are mapped using electron energy-loss spectroscopy in a scanning transmissi…
Experimental Realisation of a π/2 Vortex Mode Converter for Electrons Using a Spherical Aberration Corrector
T. Schachinger, P. Hartel, P. -H. Lu +6
In light optics, beams with orbital angular momentum (OAM) can be produced by employing a properly-tuned two-cylinder-lens arrangement, also called /2 mode converter. It is not…
The electron microscope as a quantum gate
Peter Schattschneider, Stefan Löffler
We propose to use the topological charge instead of the spin variable to span a two-dimensional Hilbert space for beam electrons in a transmission electron microscope (TEM). In thi…
Using Cerenkov radiation for measuring the refractive index in thick samples by interferometric cathodoluminescence
Michael Stöger-Pollach, Stefan Löffler, Niklas Maurer +1
Cathodoluminescence (CL) has evolved into a standard analytical technique in (scanning) transmission electron microscopy. CL utilizes light excited due to the interactions between…
Unitary Two-State Quantum Operators Realized By Quadrupole Fields in the Electron Microscope
Stefan Löffler
In this work, a novel method for using a set of electromagnetic quadrupole fields is presented to implement arbitrary unitary operators on a two-state quantum system of electrons.…
/2 Mode Converters and Vortex Generators for Electrons
Christian Kramberger, Stefan Löffler, Thomas Schachinger +3
In optics, mode conversion is an elegant way to switch between Hermite Gaussian and Laguerre Gaussian beam profiles and thereby impart orbital angular momentum onto the beam and to…
Entanglement and Entropy in Electron-Electron Scattering
Peter Schattschneider, Stefan Löffler, Herbert Gollisch +1
Treating Coulomb scattering of two free electrons in a stationary approach, we explore the momentum and spin entanglement created by the interaction. We show that a particular disc…
Convergent-Beam EMCD: Benefits, Pitfalls, and Applications
Stefan Löffler, Walid Hetaba
Energy-loss magnetic chiral dichroism (EMCD) is a versatile method for studying magnetic properties on the nanoscale. However, the classical EMCD technique is notorious for its low…
Peculiar Rotation of Electron Vortex Beams
Thomas Schachinger, Stefan Löffler, Michael Stöger-Pollach +1
Standard electron optics predicts Larmor image rotation in the magnetic lens field of a TEM. Introducing the possibility to produce electron vortex beams with quantized orbital ang…
EMCD with an electron vortex filter: Limitations and possibilities
Thomas Schachinger, Stefan Löffler, Andreas Steiger-Thirsfeld +5
We discuss the feasibility of detecting spin polarized electronic transitions with a vortex filter. This approach does not rely on the principal condition of the standard energy lo…
Mapping atomic orbitals with the transmission electron microscope: Images of defective graphene predicted from first-principles theory
Lorenzo Pardini, Stefan Löffler, Giulio Biddau +4
Transmission electron microscopy has been a promising candidate for mapping atomic orbitals for a long time. Here, we explore its capabilities by a first principles approach. For t…
Real-space mapping of electronic orbitals
Stefan Löffler, Matthieu Bugnet, Nicolas Gauquelin +5
Electronic states are responsible for most material properties, including chemical bonds, electrical and thermal conductivity, as well as optical and magnetic properties. Experimen…
Magnetic properties of single nanomagnets: EMCD on FePt nanoparticles
Sebastian Schneider, Darius Pohl, Stefan Löffler +5
Energy-loss magnetic chiral dichroism (EMCD) allows for the quantification of magnetic properties of materials at the nanometer scale. It is shown that with the support of simulati…
Imaging the dynamics of free-electron Landau states
P. Schattschneider, Th. Schachinger, M. Stöger-Pollach +4
Landau levels and states of electrons in a magnetic field are fundamental quantum entities underlying the quantum-Hall and related effects in condensed matter physics. However, the…
Atomic scale electron vortices for nanoresearch
J. Verbeeck, P. Schattschneider, S. Lazar +4
Electron vortex beams were only recently discovered and their potential as a probe for magnetism in materials was shown. Here we demonstrate a new method to produce electron vortex…
Is magnetic chiral dichroism feasible with electron vortices?
Peter Schattschneider, Stefan Löffler, Michael Stöger-Pollach +1
We discuss the feasibility of detecting magnetic transitions with focused electron vortex probes, suggested by selection rules for the magnetic quantum number. We theoretically est…
Comment on "Quantized Orbital Angular Momentum Transfer and Magnetic Dichroism in the Interaction of Electron Vortices with Matter"
Peter Schattschneider, Stefan Löffler, Johan Verbeeck
It was claimed (Lloyd et al., PRL 108 (2012) 074802) that energy loss magnetic chiral dichroism (EMCD) with electron vortex beams is feasible, and has even advantages over the stan…
A pure state decomposition approach of the mixed dynamic form factor for mapping atomic orbitals
Stefan Löffler, Viktoria Motsch, Peter Schattschneider
We demonstrate how the mixed dynamic form factor (MDFF) can be interpreted as a quadratic form. This makes it possible to use matrix diagonalization methods to reduce the number of…