Dmitry Yu. Usachov
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View article: Surface electronic structure of TbIr2Si2 antiferromagnet
Surface electronic structure of TbIr2Si2 antiferromagnet Open
By means of ab initio density functional theory (DFT) calculations, we examined the surface electronic structure of the TbIr 2 Si 2 antiferromagnet, which is distinguished by the out-of-plane alignment of Tb 4f moments and a high Neel temp…
View article: Single domain spectroscopic signatures of a magnetic Kagome metal
Single domain spectroscopic signatures of a magnetic Kagome metal Open
Spin- and orbital-resolved access to the electronic bands is necessary to establish key properties of quantum materials such as the quantum-geometric tensor. Despite recent revival on magnetic Kagome compounds, no spectroscopic access to t…
View article: Unveiling Electron‐Phonon and Electron‐Magnon Interactions in the Weak Itinerant Ferromagnet LaCo<sub>2</sub>P<sub>2</sub>
Unveiling Electron‐Phonon and Electron‐Magnon Interactions in the Weak Itinerant Ferromagnet LaCo<sub>2</sub>P<sub>2</sub> Open
Studying and understanding many‐body interactions, particularly electron‐boson interactions, is essential for a deeper elucidation of fundamental physical phenomena and the development of novel material functionalities. Here, this aspect i…
View article: Magnetic Dirac semimetal state of (Mn,Ge)Bi2Te4
Magnetic Dirac semimetal state of (Mn,Ge)Bi2Te4 Open
The ability to finely tune the properties of magnetic topological insulators (TIs) is crucial for quantum electronics. We studied solid solutions with a general formula Ge x Mn 1-x Bi 2 Te 4 between two isostructural Z 2 TIs, magnetic MnBi…
View article: Magnetism, heat capacity and electronic structure of EuCd$_2$P$_2$ in view of its colossal magnetoresistance
Magnetism, heat capacity and electronic structure of EuCd$_2$P$_2$ in view of its colossal magnetoresistance Open
The mechanism of the peculiar transport properties around the magnetic ordering temperature of semiconducting antiferromagnetic EuCd$_2$P$_2$ is not yet understood. With a huge peak in the resistivity observed above the Néel temperature, $…
View article: Long-lived spin waves in a metallic antiferromagnet
Long-lived spin waves in a metallic antiferromagnet Open
View article: Magnetic Dirac semimetal state of (Mn,Ge)Bi$_2$Te$_4$
Magnetic Dirac semimetal state of (Mn,Ge)Bi$_2$Te$_4$ Open
For quantum electronics, the possibility to finely tune the properties of magnetic topological insulators (TIs) is a key issue. We studied solid solutions between two isostructural Z$_2$ TIs, magnetic MnBi$_2$Te$_4$ and nonmagnetic GeBi$_2…
View article: Insight into the electronic structure of the centrosymmetric skyrmion magnet GdRu$_2$Si$_2$
Insight into the electronic structure of the centrosymmetric skyrmion magnet GdRu$_2$Si$_2$ Open
The discovery of a square magnetic-skyrmion lattice in GdRu$_2$Si$_2$, with the smallest so far found skyrmion diameter and without a geometrically frustrated lattice, has attracted significant attention, particularly for potential applica…
View article: Moment canting and domain effects in antiferromagnetic DyRh$_2$Si$_2$
Moment canting and domain effects in antiferromagnetic DyRh$_2$Si$_2$ Open
A combined experimental and theoretical study of the layered antiferromagnetic compound DyRh$_2$Si$_2$ in the ThCr$_2$Si$_2$-type structure is presented. The heat capacity shows two transitions upon cooling, the first one at the N{é}el tem…
View article: Colossal magnetoresistance in EuZn$_2$P$_2$ and its electronic and magnetic structure
Colossal magnetoresistance in EuZn$_2$P$_2$ and its electronic and magnetic structure Open
We investigate single crystals of the trigonal antiferromagnet EuZn$_2$P$_2$ ($P\overline{3}m1$) by means of electrical transport, magnetization measurements, X-ray magnetic scattering, optical reflectivity, angle-resolved photoemission sp…
View article: Insight into the electronic structure of the centrosymmetric skyrmion magnet GdRu<sub>2</sub>Si<sub>2</sub>
Insight into the electronic structure of the centrosymmetric skyrmion magnet GdRu<sub>2</sub>Si<sub>2</sub> Open
A combination of momentum-resolved photoemission measurements and first-principles calculations allowed us to unveil the origin of the helical magnetic order in the GdRu 2 Si 2 skyrmion magnet.
View article: Crystal electric field and properties of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mn>4</mml:mn><mml:mi>f</mml:mi></mml:mrow></mml:math> magnetic moments at the surface of the rare-earth compound <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>TbRh</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Si</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>
Crystal electric field and properties of magnetic moments at the surface of the rare-earth compound Open
The crystal electric field (CEF) plays an essential role in defining the magnetic properties of 4f materials. It forces the charge density of 4f electrons and the related magnetic moment to be oriented along a certain dir…
View article: Strong Rashba Effect and Different <i>f</i>−<i>d</i> Hybridization Phenomena at the Surface of the Heavy‐Fermion Superconductor CeIrIn<sub>5</sub>
Strong Rashba Effect and Different <i>f</i>−<i>d</i> Hybridization Phenomena at the Surface of the Heavy‐Fermion Superconductor CeIrIn<sub>5</sub> Open
New temperature scales and remarkable differences from bulk properties have increasingly placed the surfaces of strongly correlated f materials into the focus of research activities. Applying first‐principles calculations and angle‐resolve…
View article: Atomically‐Precise Texturing of Hexagonal Boron Nitride Nanostripes (Adv. Sci. 17/2021)
Atomically‐Precise Texturing of Hexagonal Boron Nitride Nanostripes (Adv. Sci. 17/2021) Open
Boron Nitride Nanostripes In article number 2101455, Khadiza Ali, J. Enrique Ortega, Frederik Schiller, and co‐workers explore a novel approach to nanopatterning a material with practical technological impact, namely growing hexagonal boro…
View article: Atomically‐Precise Texturing of Hexagonal Boron Nitride Nanostripes
Atomically‐Precise Texturing of Hexagonal Boron Nitride Nanostripes Open
Monolayer hexagonal boron nitride (hBN) is attracting considerable attention because of its potential applications in areas such as nano‐ and opto‐electronics, quantum optics and nanomagnetism. However, the implementation of such functiona…
View article: Tunneling current modulation in atomically precise graphene nanoribbon heterojunctions
Tunneling current modulation in atomically precise graphene nanoribbon heterojunctions Open
View article: Classical and cubic Rashba effect in the presence of in-plane <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mn>4</mml:mn><mml:mi>f</mml:mi></mml:math> magnetism at the iridium silicide surface of the antiferromagnet <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mrow><mml:mi>GdIr</mml:mi></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mi>Si</mml:mi></mml:mrow><mml:mn>2</mml:mn></mml:msub></mml:math>
Classical and cubic Rashba effect in the presence of in-plane magnetism at the iridium silicide surface of the antiferromagnet Open
We present a combined experimental and theoretical study of the two-dimensional electron states at the iridium-silicide surface of the antiferromagnet GdIr2Si2 above and below the Néel temperature. Using angle-resolved photoemission spectr…
View article: Photoelectron diffraction for probing valency and magnetism of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mn>4</mml:mn><mml:mi>f</mml:mi></mml:mrow></mml:math>-based materials: A view on valence-fluctuating <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>EuIr</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Si</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>
Photoelectron diffraction for probing valency and magnetism of -based materials: A view on valence-fluctuating Open
We present and discuss the methodology for modeling 4f photoemission spectra, 4f photoelectron diffraction (PED) patterns, and magnetic dichroism effects for rare-earth-based materials. Using PED and magnetic dichroism in photoemission, we…
View article: Unexpected differences between surface and bulk spectroscopic and implied Kondo properties of heavy fermion CeRh2Si2
Unexpected differences between surface and bulk spectroscopic and implied Kondo properties of heavy fermion CeRh2Si2 Open
Ultra-violet angle-resolved photoemission spectroscopy (UV-ARPES) was used to explore the temperature dependence of the Ce-4 f spectral responses for surface and bulk in the antiferromagnetic Kondo lattice CeRh 2 Si 2 . Spectra were taken …
View article: Tunneling current modulation in atomically precise graphene nanoribbon heterojunctions
Tunneling current modulation in atomically precise graphene nanoribbon heterojunctions Open
Lateral heterojunctions of atomically precise graphene nanoribbons (GNRs) hold promise for applications in nanotechnology, yet their charge transport and most of the spectroscopic properties have not been investigated. Here, we synthesize …
View article: Spin structure of spin-orbit split surface states in a magnetic material revealed by spin-integrated photoemission
Spin structure of spin-orbit split surface states in a magnetic material revealed by spin-integrated photoemission Open
The emergence of ferromagnetism in Rashba systems, where the evolving exchange interaction enters into competition with spin-orbit coupling, leads to a nontrivial spin-polarized electronic landscape with an intricate momentum-dependent spi…
View article: Cubic Rashba Effect in the Surface Spin Structure of Rare-Earth Ternary Materials
Cubic Rashba Effect in the Surface Spin Structure of Rare-Earth Ternary Materials Open
Spin-orbit interaction and structure inversion asymmetry in combination with magnetic ordering is a promising route to novel materials with highly mobile spin-polarized carriers at the surface. Spin-resolved measurements of the photoemissi…
View article: Raman spectroscopy estimation of the carrier concentration and the value of strain in monolayer graphene films grown on 4H-SiC
Raman spectroscopy estimation of the carrier concentration and the value of strain in monolayer graphene films grown on 4H-SiC Open
Comprehensive study of high-quality monolayer graphene samples grown by thermal destruction of the Si-face of the 4 H -SiC substrate was carried out. Analysis of the data obtained by Raman spectroscopy and angle-resolved photoemission spec…
View article: Structure and electronic properties of h-BN on curved crystals
Structure and electronic properties of h-BN on curved crystals Open
Trabajo presentado en 20th Trends in Nanotechnology International Conference (2019), celebrada en San Sebastián (España), del 30 de septiembre al 4 de octubre de 2019
View article: Boron nitride monolayer growth on vicinal Ni(1 1 1) surfaces systematically studied with a curved crystal
Boron nitride monolayer growth on vicinal Ni(1 1 1) surfaces systematically studied with a curved crystal Open
The structural and electronic properties of hexagonal boron nitride (hBN)\ngrown on stepped Ni surfaces are systematically investigated using a\ncylindrical Ni crystal as a tunable substrate. Our experiments reveal\nhomogeneous hBN monolay…
View article: Site- and spin-dependent coupling at the highly ordered <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>h</mml:mi></mml:math>-BN/Co(0001) interface
Site- and spin-dependent coupling at the highly ordered -BN/Co(0001) interface Open
Using photoelectron diffraction and spectroscopy, we explore the structural and electronic properties of the hexagonal boron nitride (h-BN) monolayer epitaxially grown on the Co(0001) surface. Perfect matching of the lattice parameters all…
View article: Strong spin-orbit coupling in the noncentrosymmetric Kondo lattice
Strong spin-orbit coupling in the noncentrosymmetric Kondo lattice Open
Strong spin-orbit coupling (SOC) in combination with a lack of inversion symmetry and exchange magnetic interaction proves to be a sophisticated instrument allowing efficient control of the spin orientation, energy and trajectories of two-…
View article: Boron-Doped Graphene Nanoribbons: Electronic Structure and Raman Fingerprint
Boron-Doped Graphene Nanoribbons: Electronic Structure and Raman Fingerprint Open
We investigate the electronic and vibrational properties of bottom-up synthesized aligned armchair graphene nanoribbons of N = 7 carbon atoms width periodically doped by substitutional boron atoms (B-7AGNRs). Using angle-resolved photoemis…
View article: Finding the hidden valence band of N = 7 armchair graphene nanoribbons with angle-resolved photoemission spectroscopy
Finding the hidden valence band of N = 7 armchair graphene nanoribbons with angle-resolved photoemission spectroscopy Open
To understand the optical and transport properties of graphene nanoribbons, an unambiguous determination of their electronic band structure is needed. In this work we demonstrate that the photoemission intensity of each valence sub-band, f…
View article: Photoelectron Diffraction and Holography Studies of 2D Materials and Interfaces
Photoelectron Diffraction and Holography Studies of 2D Materials and Interfaces Open
Photoelectron diffraction (XPD) and holography (XPH) are powerful spectroscopic methods that allow comprehensive exploration and characterization of certain structural properties of materials, in particular those of 2D systems and interfac…