A5004696771- Particle Detector Development and Performance
- High-Energy Particle Collisions Research
- Particle physics theoretical and experimental studies
- Radiation Detection and Scintillator Technologies
- Advanced Algebra and Geometry
- Algebraic Geometry and Number Theory
- Quantum Chromodynamics and Particle Interactions
- Inorganic and Organometallic Chemistry
- Palliative Care and End-of-Life Issues
- Various Chemistry Research Topics
- Graphene research and applications
- Nonlinear Waves and Solitons
- Nuclear Physics and Applications
- Algebraic structures and combinatorial models
- Phase-change materials and chalcogenides
- Chemistry and Chemical Engineering
- Complementary and Alternative Medicine Studies
- Chalcogenide Semiconductor Thin Films
- Dark Matter and Cosmic Phenomena
- Diet and metabolism studies
- Musculoskeletal pain and rehabilitation
- Topological Materials and Phenomena
- Atomic and Subatomic Physics Research
- Advanced Differential Equations and Dynamical Systems
- 2D Materials and Applications
University of Wuppertal
2016-2025
Centre Hospitalier de Luxembourg
2024
Luxembourg Institute of Socio-Economic Research
2024
University of Luxembourg
2024
University Hospital of Geneva
2020-2023
Hôpital Beau-Séjour
2019-2023
Moscow Engineering Physics Institute
2016-2019
Petersburg Nuclear Physics Institute
2016-2019
Kurchatov Institute
2016-2019
RWTH Aachen University
2009-2018
Using low-temperature scanning tunneling spectroscopy, we map the local density of states graphene quantum dots supported on Ir(111). Because a band gap in projected Ir structure around $K$ point, electronic properties QDs are dominantly graphenelike. Indeed, compare results favorably with tight binding calculations honeycomb lattice based parameters derived from functional theory. We find that interaction substrate near edge island gradually opens Dirac cone, which implies soft-wall...
Using high resolution spin- and angle-resolved photoemission spectroscopy, we map the electronic structure spin texture of surface states topological insulator Sb2Te3. In combination with density functional calculations (DFT), directly show that Sb2Te3 exhibits a partially occupied, single spin-Dirac cone around Fermi energy, which is topologically protected. DFT obtains polarization occupied Dirac 80-90%, in reasonable agreement experimental data after careful background subtraction....
The global polarization of {\Lambda} hyperons along the total orbital angular momentum a relativistic heavy-ion collision is presented based on high statistics data samples collected in Au+Au collisions at \sqrt{s_{NN}} = 2.4 GeV and Ag+Ag 2.55 with High-Acceptance Di-Electron Spectrometer (HADES) GSI, Darmstadt. This first measurement below strangeness production threshold nucleon-nucleon collisions. Results are reported as function centrality well hyperon transverse (p_T) rapidity (y_{CM})...
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A feasibility study has been performed in order to investigate the performance of HADES detector measure electromagnetic decays hyperon resonances $\Sigma(1385)^0$, $\Lambda(1405)$ and $\Lambda{\Lambda}(1520)$ as well production double strange baryon systems $\Xi^-$ $\Lambda\Lambda$ p+p reactions at a beam kinetic energy 4.5 GeV. The existing will be upgraded by new Forward Detector, which extends acceptance into range polar angles that plays crucial role for these investigations. analysis...
The RICH detectors of the existing HADES spectrometer and CBM experiment (to be built at FAIR) will use 64 channel Multi-Anode PMTs. We designed a complete set digitizing electronics, consisting analog digital front-end modules, power supply data concentrator cards plugged into backplane carrying 3 × 2 MAPMTs on front side, all readout modules backside. These contain necessary preamplifiers FPGA-based TDC as well trigger handling logic an optical transceiver. present electronics along with...
Abstract Phase change alloys are used for non-volatile random-access memories exploiting the conductivity contrast between amorphous and metastable, crystalline phase. However, this has never been directly related to electronic band structure. Here we employ photoelectron spectroscopy map relevant bands epitaxial GeSbTe films. The constant energy surfaces of valence close Fermi level hexagonal tubes with little dispersion perpendicular (111) surface. electron density responsible transport...
The moduli stack of principal E8-bundles over a smooth projective curve X carries natural divisor Δ. We study the pullback Δ to , where P is semisimple and simply connected group such that its Lie algebra (P) maximal conformal subalgebra (E8). show induces “Strange Duality”-type isomorphisms between Verlinde spaces at level one following pairs groups (SL (5), SL (5)), (Spin (8), Spin (8)), (3), E6), (2), E7).
Ultrathin MgO films on Mo(100) with a thickness up to 12 ML are studied by scanning tunneling microscopy and spectroscopy at room temperature. The spatial variation in the work function within film is mapped field emission resonance states (Gundlach oscillations) using $dz/dU$ spectroscopy. We found circular spots significantly reduced $(\ensuremath{\Delta}\ensuremath{\Phi}=0.6\text{ }\text{eV})$, which assigned charged defects film. On top of films, small Co clusters deposited an average...
Using low-temperature scanning tunneling spectroscopy, we probe the Landau levels of topologically protected state ${\mathrm{Sb}}_{2}{\mathrm{Te}}_{3}$(0001) after in situ cleavage a single crystal. are visible for magnetic fields $B\ensuremath{\ge}2$ T at energies, which confirm Dirac type dispersion including zeroth level. We find different velocities lower and upper part cone reasonable agreement with previous density functional theory data. The point deduced from level shifts by about 40...
Abstract Hadron production ( $$\pi ^\pm $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mi>π</mml:mi> <mml:mo>±</mml:mo> </mml:msup> </mml:math> , proton, $$\Lambda <mml:mi>Λ</mml:mi> $$K_S^0$$ <mml:msubsup> <mml:mi>K</mml:mi> <mml:mi>S</mml:mi> <mml:mn>0</mml:mn> </mml:msubsup> $$K^\pm ) in ^- + \textrm{C}$$ <mml:mrow> <mml:mo>-</mml:mo> <mml:mo>+</mml:mo> <mml:mtext>C</mml:mtext> </mml:mrow> and \textrm{W}$$ <mml:mtext>W</mml:mtext> collisions is investigated...
We compute the rational morphism of “inverse image by Frobenius” acting on coarse moduli space semi-stable rank <inline-formula content-type="math/mathml"> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" alttext="2"> <mml:semantics> <mml:mn>2</mml:mn> <mml:annotation encoding="application/x-tex">2</mml:annotation> </mml:semantics> </mml:math> </inline-formula> bundles trivial determinant over an ordinary genus curve in characteristic </inline-formula>.
Scanning tunneling microscopy and spectroscopy have been employed to reveal the evolution of band gap Fermi level as a function annealing temperature for Ge1Sb2Te4, promising material phase change memory applications. The decreases continuously from 0.65 eV in amorphous via 0.3 metastable crystalline zero stable phase. moves center close valence within phases. Moreover, has imaged with atomic resolution, presumably showing Te lattice at negative sample bias Ge/Sb/vacancy positive bias.
Scanning tunneling microscopy (STM) and spectroscopy (STS) in combination with density functional theory (DFT) calculations are employed to study the surface subsurface properties of metastable phase phase-change material ${\mathrm{Ge}}_{2}{\mathrm{Sb}}_{2}{\mathrm{Te}}_{5}$ as grown by molecular beam epitaxy. The (111) is covered an intact Te layer, which nevertheless permits detection more disordered layer made Ge Sb atoms. Centrally, we find that significantly ordered than expected for...
The HADES collaboration uses the e + − production as a probe of resonance matter produced in collisions at incident energies 1-3.5 GeV/nucleon GSI. Elementary reactions provide useful references for these studies and give information on Dalitz decays (R→Ne ). Such processes are sensitive to structure time-like electromagnetic baryon transitions kinematic range where (off-shell) vector mesons play crucial role. Results obtained proton-proton commissioning pion-beam experiment reported...