S. Babenkov
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View article: Asymmetric electrostatic dodecapole: compact bandpass filter with low aberrations for momentum microscopy
Asymmetric electrostatic dodecapole: compact bandpass filter with low aberrations for momentum microscopy Open
Imaging energy filters in photoelectron microscopes and momentum microscopes use spherical fields with deflection angles of 90°, 180° and even 2 × 180°. These instruments are optimized for high energy resolution, and exhibit image aberrati…
View article: Multi-Mode Front Lens for Momentum Microscopy: Part II Experiments
Multi-Mode Front Lens for Momentum Microscopy: Part II Experiments Open
We have experimentally demonstrated different operating modes for the front lenses of the momentum microscopes described in Part I. Measurements at energies from vacuum UV at a high-harmonic generation (HHG)-based source to the soft and ha…
View article: Influence of Bi doping on the electronic structure of (Ga,Mn)As epitaxial layers
Influence of Bi doping on the electronic structure of (Ga,Mn)As epitaxial layers Open
The influence of the addition of Bi to the (Ga,Mn)As dilute ferromagnetic semiconductor on its electronic structure as well as on its magnetic and structural properties has been studied. Epitaxial (Ga,Mn)(Bi,As) layers of high structural p…
View article: Control of the asymmetric band structure in Mn2Au by a ferromagnetic driver layer
Control of the asymmetric band structure in Mn2Au by a ferromagnetic driver layer Open
Hard X-ray angle-resolved photoemission spectroscopy reveals the momentum-resolved band structure in an epitaxial Mn2Au(001) film capped by a 2 nm thick ferromagnetic Permalloy layer. By magnetizing the Permalloy capping layer, the excepti…
View article: Active sites of Te-hyperdoped silicon by hard x-ray photoelectron spectroscopy
Active sites of Te-hyperdoped silicon by hard x-ray photoelectron spectroscopy Open
Multiple dopant configurations of Te impurities in close vicinity in silicon are investigated using photoelectron spectroscopy, photoelectron diffraction, and Bloch wave calculations. The samples are prepared by ion implantation followed b…
View article: Active Sites of Te-hyperdoped Silicon by Hard X-ray Photoelectron Spectroscopy
Active Sites of Te-hyperdoped Silicon by Hard X-ray Photoelectron Spectroscopy Open
Multiple dopant configurations of Te impurities in close vicinity in silicon are investigated using photoelectron spectroscopy, photoelectron diffraction, and Bloch wave calculations. The samples are prepared by ion implantation followed b…
View article: The SXP instrument at the European XFEL
The SXP instrument at the European XFEL Open
The successful implementation of the baseline instruments at the European XFEL has triggered a second phase of instrument developments aiming to extend the portfolio of available techniques. At the soft X-ray undulator (SASE 3), the Soft X…
View article: Hard x-ray angle-resolved photoemission from a buried high-mobility electron system
Hard x-ray angle-resolved photoemission from a buried high-mobility electron system Open
Novel two-dimensional electron systems at the interfaces and surfaces of\ntransition-metal oxides recently have attracted much attention as they display\ntunable, intriguing properties that can be exploited in future electronic\ndevices. H…
View article: Direct observation of antiferromagnetic parity violation in the electronic structure of Mn<sub>2</sub>Au
Direct observation of antiferromagnetic parity violation in the electronic structure of Mn<sub>2</sub>Au Open
Using momentum microscopy with sub- µ m spatial resolution, allowing momentum resolved photoemission on individual antiferromagnetic domains, we observe an asymmetry in the electronic band structure, , in Mn 2 Au. This broken ba…
View article: Systematic study of niobium thermal treatments for superconducting radio frequency cavities employing x-ray photoelectron spectroscopy
Systematic study of niobium thermal treatments for superconducting radio frequency cavities employing x-ray photoelectron spectroscopy Open
The structural and chemical composition of the surface layer (100–140 nm) of niobium radiofrequency cavities operating at cryogenic temperature has enormous impact on their superconducting characteristics. During the last years, cavities t…
View article: Direct Observation of Antiferromagnetic Parity Violation in the Electronic Structure of Mn2Au
Direct Observation of Antiferromagnetic Parity Violation in the Electronic Structure of Mn2Au Open
Parity symmetric photoemission spectra are ubiquitous in solid state research, being prevalent in many highly active areas, such as unconventional superconductors, nonmagnetic and antifer- romagnetic topological insulators, and weakly rela…
View article: Towards complete band structure of microscopic MoS<sub>2</sub> flakes
Towards complete band structure of microscopic MoS<sub>2</sub> flakes Open
The occupied and unoccupied electronic states of MoS2 monolayer isolated flake were studied using laboratory based photoemission electron microscope (PEEM) nanoESCA equipped with He-I photon source. PEEM real-space imaging allowed selectin…
View article: Synchrotron XPS Study of Niobium Treated with Nitrogen Infusion
Synchrotron XPS Study of Niobium Treated with Nitrogen Infusion Open
Processing of niobium cavities with the so-called ni-trogen infusion treatment demonstrates the improve-ment of efficiency and no degradation of maximal accelerating gradients. However, the chemical compo-sition of the niobium surface and …
View article: Time-of-flight photoelectron momentum microscopy with 80–500 MHz photon sources: electron-optical pulse picker or bandpass pre-filter
Time-of-flight photoelectron momentum microscopy with 80–500 MHz photon sources: electron-optical pulse picker or bandpass pre-filter Open
The small time gaps of synchrotron radiation in conventional multi-bunch mode (100–500 MHz) or laser-based sources with high pulse rate (∼80 MHz) are prohibitive for time-of-flight (ToF) based photoelectron spectroscopy. Detectors with tim…
View article: Study of the Formation and Properties of In–CuPcF4 Nanocomposite Materials in the Mode of the Millisecond Recording of Photoelectron Spectra
Study of the Formation and Properties of In–CuPcF4 Nanocomposite Materials in the Mode of the Millisecond Recording of Photoelectron Spectra Open
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View article: Hard x-ray angle-resolved photoemission from a buried high-mobility electron system
Hard x-ray angle-resolved photoemission from a buried high-mobility electron system Open
Novel two-dimensional electron systems at the interfaces and surfaces of transition-metal oxides recently have attracted much attention as they display tunable, intriguing properties that can be exploited in future electronic devices. Here…
View article: Bulk spin polarization of magnetite from spin-resolved hard x-ray photoelectron spectroscopy
Bulk spin polarization of magnetite from spin-resolved hard x-ray photoelectron spectroscopy Open
There is broad consensus that magnetite (${\mathrm{Fe}}_{3}{\mathrm{O}}_{4}$) is a promising material for spintronics applications due to its high degree of spin polarization at the Fermi level. However, previous attempts to measure the sp…
View article: Time-of-Flight Photoelectron Momentum Microscopy at 100-500 MHz Synchrotron Sources: Electron-Optical Chopping or Bandwidth Pre-Selection
Time-of-Flight Photoelectron Momentum Microscopy at 100-500 MHz Synchrotron Sources: Electron-Optical Chopping or Bandwidth Pre-Selection Open
The small time gap of synchrotron radiation in conventional multi-bunch mode (100-500MHz) is prohibitive for time-of-flight (ToF) based electron spectroscopy. Even the new generation of delay-line detectors with improved time resolution (<…
View article: Suppression of the vacuum space-charge effect in fs-photoemission by a retarding electrostatic front lens
Suppression of the vacuum space-charge effect in fs-photoemission by a retarding electrostatic front lens Open
The performance of time-resolved photoemission experiments at fs-pulsed photon sources is ultimately limited by the e–e Coulomb interaction, downgrading energy and momentum resolution. Here, we present an approach to effectively suppress s…
View article: Band structure tuning of Heusler compounds: Spin- and momentum-resolved electronic structure analysis of compounds with different band filling
Band structure tuning of Heusler compounds: Spin- and momentum-resolved electronic structure analysis of compounds with different band filling Open
Half-metallic ferromagnetic Heusler compounds represent an important class of materials for spintronic applications. We experimentally observe the dispersion of electronic bands with spin resolution in three representative Heusler compound…
View article: Néel Vector Induced Manipulation of Valence States in the Collinear Antiferromagnet Mn<sub>2</sub>Au
Néel Vector Induced Manipulation of Valence States in the Collinear Antiferromagnet Mn<sub>2</sub>Au Open
The coupling of real and momentum space is utilized to tailor electronic properties of the collinear metallic antiferromagnet Mn2Au by aligning the real space Néel vector indicating the direction of the staggered magnetization. Pulsed magn…
View article: Hard X-ray Photoelectron Momentum Microscopy and Kikuchi Diffraction on (In,Ga,Mn)As Thin Films
Hard X-ray Photoelectron Momentum Microscopy and Kikuchi Diffraction on (In,Ga,Mn)As Thin Films Open
Recent advances in the brilliance of hard-X-ray beamlines and photoelectron momentum microscopy facilitate bulk valence-band mapping and core-level-resolved hard-X-ray photoelectron diffraction (hXPD) for structural analysis in the same se…
View article: Emitter-site specificity of hard x-ray photoelectron Kikuchi-diffraction
Emitter-site specificity of hard x-ray photoelectron Kikuchi-diffraction Open
High-resolution full-field imaging of ( k x , k y ) photoelectron distributions ( k -resolution 0.03 Å −1 , angular resolution 0.03° at 6.7 keV) in a large field of view (up to 16 Å −1 dia.) allows to observe fine details in Kikuchi-type d…
View article: 2D/3D Metallic Nano-objects Self-Organized in an Organic Molecular Thin Film
2D/3D Metallic Nano-objects Self-Organized in an Organic Molecular Thin Film Open
We present the fabrication and investigation of the properties of nanocomposite structures consisting of two-dimensional (2D) and three-dimensional (3D) metallic nano-objects self-organized on the surface and inside of organic molecular th…
View article: Rashba splitting of the Tamm surface state on Re(0001) observed by spin-resolved photoemission and scanning tunneling spectroscopy
Rashba splitting of the Tamm surface state on Re(0001) observed by spin-resolved photoemission and scanning tunneling spectroscopy Open
Using spin-resolved time-of-flight momentum microscopy, the Rashba splitting of the Tamm surface state is investigated. This state resides at the Fermi level in a projected bulk band gap of the close-packed (0001) surface of hcp Re. The Ra…
View article: Momentum-transfer model of valence-band photoelectron diffraction
Momentum-transfer model of valence-band photoelectron diffraction Open
Recent instrumental progress of valence-band photoemission in the X-ray range allows uncovering bulk- and surface-related electronic properties. Four-dimensional recording of energy and momentum-vector gives access to the complete spectral…
View article: Progress in HAXPES performance combining full-field <i>k</i>-imaging with time-of-flight recording
Progress in HAXPES performance combining full-field <i>k</i>-imaging with time-of-flight recording Open
An alternative approach to hard-X-ray photoelectron spectroscopy (HAXPES) has been established. The instrumental key feature is an increase of the dimensionality of the recording scheme from 2D to 3D. A high-energy momentum microscope dete…
View article: High-resolution hard-x-ray photoelectron diffraction in a momentum microscope—the model case of graphite
High-resolution hard-x-ray photoelectron diffraction in a momentum microscope—the model case of graphite Open
Hard x-ray photoelectron diffraction (hXPD) patterns recorded with a momentum microscope with high k -resolution (0.025 Å −1 equivalent to an angular resolution of 0.034° at 7 keV) reveal unprecedented rich fine structure. We have studied …