Ján Rusz

Progress in Spatially Resolved Magnon Spectroscopy in the STEM

Demie Kepaptsoglou, Florian Castioni, José Ángel Castellanos-Reyes, Jorge Luis Briseño Gómez et autres

Instrumentation advances for high-resolution electron-energy-loss spectroscopy (EELS) in the scanning transmission electron microscope (STEM) over the last decade have pushed the capabilities of analytical electron microscopy into the meV range [1]. Beyond vibrational spectroscopy, it was recently demonstrated that magnons, quasiparticles which …

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Position Dependent Vibrational Signal Variations Imaged by Momentum-Selective Vibrational Spectroscopy

Xingxu Yan, Y T Huang, Paul Zeiger, Ján Rusz et autres

Electron energy-loss spectroscopy (EELS) in advanced scanning transmission electron microscope (STEM) is a powerful and versatile tool to investigate diverse chemical and physical properties of materials. With the advent of new-type monochromator and spectrometer, the state-of-the-art monochromated EELS in the aberration-corrected STEM …

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Thermal Transport through Defects in Rutile with Atomic Resolution STEM-EELS

Martin OŠMERA, Shihao Wang, Julio Alves Do Nascimento, Jack Fawcett-Houghton et autres

Scanning transmission electron microscopy (STEM) with electron energy-loss spectroscopy (EELS) has been used routinely to study the chemical composition of samples with atomic precision for long time. In 2014 monochromation with full-width half-maximum below 10 meV in a modern aberration corrected setup …

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Towards an Understanding of Phase-Shape Dichroism in Vibrational EELS

Paul Zeiger, Guodong Ren, Ján Rusz, Juan Carlos Idrobo

The angular momentum carried by the quanta of lattice excitation, so-called axial phonons, has recently attracted a lot of research interest due to its potential importance for future angular momentum based information processing systems [1]. For example, one can easily imagine that …

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Atomic Insights into Hidden Structural Order in Altermagnets and Chirality-Driven Topology

Guodong Ren, Jonathan M. DeStefano, Xi Zhang, Arashdeep Thind et autres

Symmetry and order parameters in crystalline solids play a fundamental role in shaping their physical properties. The intimate interplay between orbital, spin, and lattice degrees of freedom has enabled a broad range of exotic phases and emergent phenomena [1]. Currently, there is …

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Preliminary Steps Toward a Full Magnetic Multislice Treatment of Momentum-Resolved Magnetic Inelastic Scattering Simulations

Jorge Luis Briseño-Gómez, José Ángel Castellanos-Reyes, Ján Rusz

Understanding magnetic excitations in materials at nanometer resolution requires quantitative modeling of electron–magnetic moment interactions beyond conventional electrostatic multislice approaches. We present a forward dynamical electron scattering (FDES)[1] magnetic multislice [2,3] implementation that incorporates transverse magnetic scattering contributions [4] within a reciprocal-space …

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torched-TACAW

Martin OŠMERA, Ján Rusz

TACAW engine built around Hamish Brown's py_multislice. Running on torch, gpu accelaerated.

torched-TACAW

Martin OŠMERA, Ján Rusz

TACAW engine built around Hamish Brown's py_multislice. Running on torch, gpu accelaerated.

Atomic-Scale Observation of Symmetry Breaking in Altermagnetic MnTe

Guodong Ren, Jonathan M. DeStefano, Xiaowei Zhang, Arashdeep Singh Thind et autres

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Combining Frozen Trajectory Excitation and TACAW for in silico Time-Resolved Vibrational Electron Energy Loss/Gain Spectroscopy

W. Marciniak, Joanna Marciniak, José Ángel Castellanos-Reyes, Ján Rusz

Seeing that ultrafast (picosecond timescale) vibrational electron energy loss spectroscopy (EELS) should soon be experimentally realizable, we present in silico approach capable of providing insight from the computational physics perspective. We present a framework that combines frozen trajectory excitation (FTE) with time …

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Atomic-Scale Observation of Symmetry Breaking in Altermagnetic MnTe

Guodong Ren, Jonathan M. DeStefano, Xiao-Wei Zhang, Arashdeep S. Thind et autres

The recent discovery of altermagnetism has sparked growing interest in compensated magnetic systems as promising platforms for highly scalable spintronics. Altermagnetism is a distinct magnetic order where opposite spin sublattices are connected by rotation, yielding zero net magnetization but momentum-dependent spin splitting. …

Atomic-Scale Observation of Symmetry Breaking in Altermagnetic MnTe

Guodong Ren, Jonathan M. DeStefano, Xiao-Wei Zhang, Arashdeep S. Thind et autres

The recent discovery of altermagnetism has sparked growing interest in compensated magnetic systems as promising platforms for highly scalable spintronics. Altermagnetism is a distinct magnetic order where opposite spin sublattices are connected by rotation, yielding zero net magnetization but momentum-dependent spin splitting. …

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