A5002046780- Graphene research and applications
- Topological Materials and Phenomena
- 2D Materials and Applications
- Rare-earth and actinide compounds
- Quantum and electron transport phenomena
- Magnetic and transport properties of perovskites and related materials
- Semiconductor materials and devices
- Magnetic properties of thin films
- Inorganic Chemistry and Materials
- Diamond and Carbon-based Materials Research
- Iron-based superconductors research
- Advanced Condensed Matter Physics
- Electronic and Structural Properties of Oxides
- MXene and MAX Phase Materials
- Graphene and Nanomaterials Applications
- Electrocatalysts for Energy Conversion
- Magnetism in coordination complexes
- Surface and Thin Film Phenomena
- Physics of Superconductivity and Magnetism
- Advancements in Battery Materials
- Crystallography and Radiation Phenomena
- Advanced battery technologies research
- Phase-change materials and chalcogenides
- Theoretical and Computational Physics
- Supercapacitor Materials and Fabrication
St Petersburg University
2015-2024
Moscow Institute of Physics and Technology
2024
Abstract 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 TIs, MnBi and nonmagnetic GeBi invariants 1;000 1;001, respectively. observed linear x-dependent properties, composition-independent pairwise exchange interactions, phase transitions (TPTs) topologically nontrivial phases semimetal state. TPTs are driven purely by...
The mechanism of the peculiar transport properties around magnetic ordering temperature semiconducting antiferromagnetic ${\mathrm{EuCd}}_{2}{\mathrm{P}}_{2}$ is not yet understood. With a huge peak in resistivity observed above N\'eel ${T}_{\mathrm{N}}=10.6\phantom{\rule{0.28em}{0ex}}\mathrm{K}$, it exhibits colossal magnetoresistance effect. Recent reports on observations ferromagnetic contributions ${T}_{\mathrm{N}}$ as well metallic behavior below this have motivated us to perform...
One of the approaches to manipulate MnBi2Te4 properties is magnetic dilution, which inevitably affects interplay magnetism and band topology in system. In this work, we carried out angle-resolved photoemission spectroscopy (ARPES) measurements density functional theory (DFT) calculations for analysing changes electronic structure Mn1-xGexBi2Te4 that occur under parameter x variation. We consider two ways Mn/Ge substitution: (i) bulk doping whole system; (ii) surface first septuple layer. For...
The modification of the graphene spin structure is interest for novel possibilities application in spintronics. most exciting them demand not only high value spin-orbit splitting states, but non-Rashba behavior and spatial modulation interaction. In this work we study electronic on Ir(111) with intercalated Pt monolayer. interlayer does change $9.3\ifmmode\times\else\texttimes\fi{}9.3$ superlattice graphene, while Dirac cone becomes modified. It shown that Rashba $\ensuremath{\pi}$ state...
We study the effect of thermal oxygen exposure on a monolayer h-BN grown vicinal Ni surfaces by scanning tunneling microscopy, X-ray absorption, and photoemission spectroscopies. Using curved crystal, we carry out systematic exploration interfacing full variety orientations around (111) high-symmetry direction. demonstrate occurrence two processes upon exposure: intercalation underneath layer, which leads to decoupling from substrate, oxidation itself, proceeds via substitution nitrogen...
Spin injectors based on an insulating hexagonal boron nitride ($h$-BN) film and a ferromagnetic Co surface remain promising for spintronic applications. However, sharp well-defined interface is required high performance. Here, the authors explore structural electronic properties of $h$-BN monolayer epitaxially grown single-crystalline cobalt surface. They give comprehensive description structure uncover peculiarities interaction between atoms at interface.
We present and discuss the methodology for modeling $4f$ photoemission spectra, photoelectron diffraction (PED) patterns, magnetic dichroism effects rare-earth-based materials. Using PED in photoemission, we explore electronic properties of near-surface region valence-fluctuating material ${\mathrm{EuIr}}_{2}{\mathrm{Si}}_{2}$. For Eu-terminated surface, found that topmost Eu layer is divalent exhibits a ferromagnetic order below 10 K. The valency next layer, fifth atomic about 2.8 at low...
A magnetic field modifies optical properties and provides valley splitting in a molybdenum disulfide (MoS2) monolayer. Here we demonstrate scalable approach to the epitaxial synthesis of MoS2 monolayer on graphene/Co system. Using spin- angle-resolved photoemission spectroscopy observe proximity effect that causes 20 meV spin-splitting at Γ̅ point canting spins K̅ valence band toward in-plane direction cobalt magnetization. Our density functional theory calculations reveal spin component is...
We convert polycrystalline graphene into monocrystalline graphene, and explore the kinetics of two-dimensional recrystallization as well underlying mechanism.
We used x-ray photoemission and absorption spectroscopies to study the influence of thermal molecular oxygen exposure on h-BN/Co(0001) h-BN/Au/Co(0001) systems. The spectral analysis was supported by density functional theory calculations. It is shown that can intercalate h-BN Co(0001) also be embedded into its lattice, replacing nitrogen atoms. Upon substitution, structures containing one (BN2O) three (BO3) atoms in boron atom environment are formed predominantly. In case gold-intercalated...
In-plane heterostructures of hexagonal boron nitride (h-BN) and graphene (Gr) have recently appeared in the focus material science research owing to their intriguing tunable electronic properties. However, disclosure atomic structure properties one-dimensional heterojunctions between Gr h-BN domains remains a largely unexplored challenging task. Here, we report an approach obtain perfectly oriented atomically thin hybrid h-BN–Gr heterolayer on Co(0001) surface. A perfect matching lattice...
To use efficiently the magnetic functionalities emerging at surfaces or interfaces of novel lanthanides-based materials, there is a need for complementary methods to probe atomic-layer resolved properties. Here, we show that 4f photoelectron spectroscopy highly sensitive collective orientation moments and, thus, powerful tool characterizing related demonstrate this, present results systematic study family layered crystalline 4f-materials, which are crystallized in body-centered tetragonal...
The orientation of the 4f moments offers an additional degree freedom for engineering spin-related properties in spintronic nanostructures lanthanides. Yet, precise monitoring direction magnetic remains a challenge. Here, on example antiferromagnets HoRh2Si2 and DyRh2Si2, we investigate temperature-dependent canting near surface. We demonstrate that this can be understood framework crystal electric field theory exchange interaction. Using photoelectron spectroscopy, disclose subtle but...
Intercalation of noble metals can produce giant Rashba-type spin–orbit splittings in graphene. The splitting more than 100 meV has yet to be achieved graphene on metal or semiconductor substrates. Here, we report the p-type obtained by Pt intercalation zero-layer SiC substrate. spin ∼200 was observed at a wide range binding energies. Comparing results theoretical studies different models with experimental ones measured spin-ARPES, XPS and STM methods, concluded that inducing requires not...
We present a comparative study of oxygen intercalation under polycrystalline and highly ordered graphene samples on the Co(0001) surface, which are relevant for magnetic applications. A comprehensive experimental by means microscopic spectroscopic techniques shows that leads to hole-doping decoupling from strongly bound cobalt surface. However, only samples, full was achieved. The kinetics intercalation, etching, oxidation has been thoroughly investigated. obtained results have allowed us...
The properties of atomically thin materials essentially depend on their structures, including impurities, defects and interfaces with underlying substrates. Thus, the detailed structural information is relevant for creation 2D desired properties. Here, we explore capabilities photoelectron diffraction holography analysis layers using as examples such systems h-BN, graphene, modified graphene boron impurities. We show that planar crystals commensurate interface to substrate, it possible...
Abstract Comprehensive study of high-quality monolayer graphene samples grown by thermal destruction the Si-face 4 H -SiC substrate was carried out. Analysis data obtained Raman spectroscopy and angle-resolved photoemission suggest need to use Fermi velocity in layer under obtain a correct estimate electron concentration strain values using data. This statement is valid not only for on SiC substrate, but any other as well, since depends dielectric constant substrate.