A5074385712- Graphene research and applications
- Topological Materials and Phenomena
- Quantum and electron transport phenomena
- 2D Materials and Applications
- Surface and Thin Film Phenomena
- Magnetic properties of thin films
- Advanced Condensed Matter Physics
- Carbon Nanotubes in Composites
- Chemical and Physical Properties of Materials
- Advancements in Battery Materials
- Electronic and Structural Properties of Oxides
- Diamond and Carbon-based Materials Research
- Advanced Memory and Neural Computing
- Iron-based superconductors research
- Fullerene Chemistry and Applications
- Magnetic and transport properties of perovskites and related materials
- Physics of Superconductivity and Magnetism
- Semiconductor materials and interfaces
- Semiconductor materials and devices
- Aluminum Alloys Composites Properties
- Copper Interconnects and Reliability
- Rare-earth and actinide compounds
- Graphene and Nanomaterials Applications
- Molecular Junctions and Nanostructures
- Psychological and Educational Research Studies
St Petersburg University
2016-2025
Institute of Physics
2007-2011
For the purpose of recovering intriguing electronic properties freestanding graphene at a solid surface, self-organized on Au monolayer Ni(111) is prepared and characterized by scanning tunneling microscopy. Angle-resolved photoemission reveals gapless linear $\ensuremath{\pi}$-band dispersion near $\overline{K}$ as fingerprint strictly Dirac crossing energy equal to Fermi (${E}_{F}$) within 25 meV meaning charge neutrality. Spin resolution shows Rashba effect $\ensuremath{\pi}$ states with...
Quantum states of matter combining non-trivial topology and magnetism attract a lot attention nowadays; the special focus is on magnetic topological insulators (MTIs) featuring quantum anomalous Hall axion insulator phases. Feasibility many novel phenomena that \emph{intrinsic} TIs may host depends crucially our ability to engineer efficiently tune their electronic structures. Here, using angle- spin-resolved photoemission spectroscopy along with \emph{ab initio} calculations we report large...
Graphene is considered a candidate material for spintronics. Recently, graphene grown on Ni(111) has been reported to show Rashba effect which depends the magnetization. By spin- and angle-resolved photoelectron spectroscopy, we investigate preconditions such an Ni as well Co $\ensuremath{\sim}3\ifmmode\times\else\texttimes\fi{}$ larger $3d$ magnetic moment: (i) spin polarization or (ii) exchange splitting of $\ensuremath{\pi}$ states in normal emission geometry, (iii) Rashba-type spin-orbit...
Recently discovered intrinsic antiferromagnetic topological insulator MnBi$_2$Te$_4$ presents an exciting platform for realization of the quantum anomalous Hall effect and a number related phenomena at elevated temperatures. An important characteristic making this material attractive applications is its predicted large magnetic gap Dirac point (DP). However, while early experimental measurements reported on DP gaps, recent studies claimed to observe gapless dispersion cone. Here, using...
With the discovery and first characterization of graphene, its potential for spintronic applications was recognized immediately. Since then, an active field research has developed trying to overcome practical hurdles. One most severe challenges is find appropriate interfaces between graphene ferromagnetic layers, which are granting efficient injection spin-polarized electrons. Here, we show that grown under conditions on Co(0001) demonstrates perfect structural properties simultaneously...
This paper reports spin-dependent valence-band dispersions of graphene synthesized on Ni(111) and subsequently intercalated with monolayers Au, Cu Bi. We have previously shown that after intercalation Au the dispersion π band remains linear in region point surface Brillouin zone even though system exhibits a noticeable hybridization between states d Au. also demonstrated giant spin–orbit splitting Au-intercalated which can reach up to ∼100 meV. In this we probe detail π–Au hybridized bands....
The implementation of future graphene-based electronics is essentially restricted by the absence a band gap in electronic structure graphene. Options how to create reproducible and processing compatible manner are very limited at moment. A promising approach for graphene engineering introduce large-scale sublattice asymmetry. Using photoelectron diffraction spectroscopy we have demonstrated selective incorporation boron impurities into only one two sublattices. We shown that well-oriented on...
Embedding foreign atoms or molecules in graphene has become the key approach its functionalization and is intensively used for tuning structural electronic properties. Here, we present an efficient method based on chemical vapor deposition large scale growth of boron-doped (B-graphene) Ni(111) Co(0001) substrates using carborane as precursor. It shown that up to 19 at. % boron can be embedded matrix a planar C-B sp(2) network formed. resistant air exposure widely retains structure metals....
Regardless of the widely accepted opinion that there is no Raman signal from single-layer graphene when it strongly bonded to a metal surface, we present spectra monolayer on Ni(111) and Co(0001) substrates. The high binding energy carbon these surfaces allows formation lattice-matched (1 × 1) structures where significantly stretched. This reflected in record-breaking shift G band by more than 100 cm–1 relative case freestanding graphene. Using electron diffraction photoemission...
The electronic and spin structure of a graphene monolayer synthesized on Pt(111) has been investigated experimentally by angle- spin-resolved photoemission with different polarizations incident synchrotron radiation using density functional theory calculations. It is shown that despite the observed total quasifreestanding character dispersion $\ensuremath{\pi}$ state remarkable local distortions breaks in dispersions take place due to hybridization between Pt $d$ states. Corresponding...
A rich class of spintronics-relevant phenomena require implementation robust magnetism and/or strong spin–orbit coupling (SOC) to graphene, but both properties are completely alien it. Here, we for the first time experimentally demonstrate that a quasi-freestanding character, exchange splitting and giant SOC perfectly achievable in graphene at once. Using angle- spin-resolved photoemission spectroscopy, show Dirac state Au-intercalated on Co(0001) experiences (up 0.2 eV) while being by no...
A combined scanning tunneling microscopy, angle- and spin-resolved photoemission spectroscopy density functional theory study of graphene on Ir(1 1 1) intercalated with a well-ordered, full Pb monolayer is presented. Lead intercalation between reduces the coupling to metallic substrate in such way that its corrugation becomes negligible distortions linear dispersion largely disappear, while graphene's sublattice symmetry maintained it turns out be n-doped. Remarkably, spin–orbit splittings...
High-resolution spin- and angle-resolved photoemission spectroscopy measurements were performed on the three-dimensional topological insulator Bi${}_{2}$Te${}_{2.4}$Se${}_{0.6}$, which is characterized by enhanced thermoelectric properties. The Fermi level position found to be located in bulk energy gap independent of temperature it stable over a long time. Spin textures Dirac-cone state at energies above below Dirac point as well Rashba-type valence band surface are observed agreement with...
The spin polarization of W(110) and Al/W(110) surfaces is studied by spin- angle-resolved photoemission. On both distinct $E({\mathbf{k}}_{\ensuremath{\parallel}})$ dispersions are identified with an unusual topology: A single spectral branch polarized antisymmetrically relative to the $\overline{\ensuremath{\Gamma}}$ point, two spin-polarized branches cross at $\overline{\ensuremath{\Gamma}}$. crossing disperse linearly but this similarity a Dirac cone lost after deposition Al, where they...
Spin electronic structure of the Graphene/Pt interface has been investigated. A large induced spin-orbit splitting (∼80 meV) graphene π states with formation non-degenerated Dirac-cone spin at K¯-point Brillouin zone crossed spin-polarized Pt 5d Fermi level was found. We show that this can be used as a current source in spintronic devices. By theoretical estimations and micromagnetic modeling based on experimentally observed splitting, we demonstarte intrinsic magnetic field such might...
We investigate the long-standing question whether or not a large spin-orbit splitting can be induced in light quantum film by substrate effect. It is shown that quantum-well states Al films on W(110) display Rashba-type splittings up to at least ten monatomic layers (MLs) angle-resolved photoemission measurements with and without spin resolution. Moreover, 10 ML thickness, non-Rashba-type behavior of observed attaining its maximum value...
It has recently been demonstrated that pentacene can serve as protection layer for graphene on SiC preserving the unique E(k) band dispersion after exposure to atmosphere and subsequent annealing in vacuum. We confirm stability of ideal but without any layer. demonstrate this by angle-resolved photoemission Ni(111) intercalated a Au monolayer. Exposure air does not carbidize or oxidize Ni substrate open an apparent gap graphene. Its doping state is affected Rashba-type spin-orbit effect π preserved.
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...