Design and performance of a spin-polarized electron energy loss spectrometer with high momentum resolution

Vasilyev, Dmitry; Kirschner, J.

doi:10.1063/1.4961471

Cited by 7 publications

(3 citation statements)

References 27 publications

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“…Thus the high photon flux typically only available using synchrotron-based photoemission facilities is generally advantageous for SARPES. In parallel, recent developments of multi-channel spin detectors using different and more efficient detection schemes promise a better understanding of spin textures from materials as well as the spin-ARPES process itself [65,66].…”

Section: Sarpesmentioning

confidence: 99%

Roadmap on finding chiral valleys: screening 2D materials for valleytronics

et al. 2018

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In this review, we present an update on the methods for screening 2D materials suitable for valleytronic applications. We begin with an introduction to the field highlighting some of the latest findings and seminal works. Then we provide a brief background on the physics of valley- and layer- pseudospins in layered 2D materials such as transition metal dichalcogenides. This is followed by a detailed survey of a number of key techniques commonly employed to elucidate valley properties in such materials, highlighting in particular their capability for discriminating valley pseudospins, their key advantages and current limitations. Finally, we conclude by summarising the state-of-the-art assessing materials for valleytronic applications and point the reader to the current open questions that could have critical influence on the technological impact that may be derived from such materials.

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Section: Sarpesmentioning

confidence: 99%

Roadmap on finding chiral valleys: screening 2D materials for valleytronics

et al. 2018

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“…In the so-called complete experiment, where a spin-polarized beam is used as the source and the detection is also spin resolved, all the four possible partial intensities are known [14]. Such experiments can be designed with a high momentum resolution but usually suffer from a poor energy resolution, due to the inefficiency of the spin detectors for the inelastic part of the scattering [35]. Hence, in the usual SPHREELS experiments only the incoming beam is spin polarized and the detection is not spin-resolved [11,22,23,36].…”

Section: Discussionmentioning

confidence: 99%

Theory of spin-polarized high-resolution electron energy loss spectroscopy from nonmagnetic surfaces with a large spin-orbit coupling

Zakeri

Berthod

2022

Phys. Rev. B

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The scattering theory of low-energy (slow) electrons has been developed by Evans and Mills [Phys. Rev. B 5, 4126 (1972)]. The formalism is merely based on the electrostatic Coulomb interaction of the scattering electrons with the charge-density fluctuations above the surface and can describe most of the interesting features observed in the high-resolution electron energy-loss spectroscopy experiments. Here we extend this theory by including the spin-orbit coupling in the scattering process. We discuss the impact of this interaction on the scattering cross-section. In particular, we discuss cases in which a spin-polarized electron beam is scattered from nonmagnetic surfaces with a strong spin-orbit coupling. We show that under some assumptions one can derive an expression for the scattering cross-section, which can be used for numerical calculations of the spin-polarized spectra recorded by spin-polarized high-resolution electron energy-loss spectroscopy experiments.Here we revisit the theory of low-energy electron scat-

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“…For user experiments, the XUV beamline is directly connected to an energy-filtering photoemission microscope (NanoESCA), equipped with a wide range of measurement modes predestined for momentum microscopy, ARPES of very localized features, and imaging spectroscopy [79,80]. The beamline will be soon extended with a unique and versatile liquid jet apparatus to perform either photoelectron spectroscopy or transient absorption spectroscopy measurements.…”

Section: Discussionmentioning

confidence: 99%

Spectrally tunable ultrashort monochromatized extreme ultraviolet pulses at 100 kHz

Csizmadia¹,

Filus²,

Grósz³

et al. 2022

Preprint

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We present the experimental realization of spectrally tunable, ultrashort, quasimonochromatic extreme ultraviolet (XUV) pulses generated at 100 kHz repetition rate in a user-oriented gas high harmonic generation (GHHG) beamline of the Extreme Light Infrastructure -Attosecond Light Pulse Source (ELI ALPS) facility. Versatile spectral and temporal shaping of the XUV pulses are accomplished with a double-grating, time-delay compensated monochromator accommodating the two composing stages in a novel, asymmetrical geometry. This configuration supports the achievement of high monochromatic XUV flux (2.8±0.9 × 10 10 photons/s) combined with ultrashort pulse duration (4.0±0.2 fs using 12.1±0.6 fs driving pulses) and small spot size (sub-100 µm). Focusability, spectral bandwidth, and overall photon flux of the produced radiation were investigated covering a wide range of instrumental configurations. Moreover, complete temporal (intensity and phase) characterization of the few-femtosecond monochromatic XUV pulses -a goal that is difficult to achieve by conventional reconstruction techniques -has been realized using ptychographic algorithm on experimentally recorded XUV-IR pump-probe traces. The presented results contribute to in-situ, time-resolved experiments accessing direct information on the electronic structure dynamics of novel target materials.

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Design and performance of a spin-polarized electron energy loss spectrometer with high momentum resolution

Cited by 7 publications

References 27 publications

Roadmap on finding chiral valleys: screening 2D materials for valleytronics

Roadmap on finding chiral valleys: screening 2D materials for valleytronics

Theory of spin-polarized high-resolution electron energy loss spectroscopy from nonmagnetic surfaces with a large spin-orbit coupling

Spectrally tunable ultrashort monochromatized extreme ultraviolet pulses at 100 kHz

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