A5006502068- Surface and Thin Film Phenomena
- Advanced Condensed Matter Physics
- Electronic and Structural Properties of Oxides
- Advanced Chemical Physics Studies
- Quantum and electron transport phenomena
- Graphene research and applications
- Physics of Superconductivity and Magnetism
- Magnetic and transport properties of perovskites and related materials
- Semiconductor materials and devices
- Magnetic properties of thin films
- Semiconductor Quantum Structures and Devices
- ZnO doping and properties
- Chalcogenide Semiconductor Thin Films
- Electron and X-Ray Spectroscopy Techniques
- Topological Materials and Phenomena
- Advancements in Battery Materials
- Semiconductor materials and interfaces
- Inorganic Chemistry and Materials
- Multiferroics and related materials
- 2D Materials and Applications
- Boron and Carbon Nanomaterials Research
- Carbon Nanotubes in Composites
- Iron oxide chemistry and applications
- Advanced Semiconductor Detectors and Materials
- Ga2O3 and related materials
MAX IV Laboratory
2014-2025
Lund University
2014-2024
Linköping University
2009-2014
Tohoku University
2006-2007
The adsorption of Ni, Co, Mn, Ti, and Zr at the $(\sqrt{2}\ifmmode\times\else\texttimes\fi{}\sqrt{2})\text{R}{45}^{\ensuremath{\circ}}$-reconstructed ${\mathrm{Fe}}_{3}{\mathrm{O}}_{4}(001)$ surface was studied by scanning tunneling microscopy, x-ray ultraviolet photoelectron spectroscopy, low-energy electron diffraction (LEED), density functional theory (DFT). Following deposition room temperature, metals are either adsorbed as isolated adatoms or fill subsurface cation vacancy sites...
Layered cobalt oxides have been shown to be highly active catalysts for the oxygen evolution reaction (OER; half of catalytic "water splitting" reaction), particularly when promoted with gold. However, surface chemistry and in particular nature synergistic effect gold contact are only understood on a rudimentary level, which at present prevents further exploration. We synthesized model system flat, layered oxide nanoislands supported single crystal (111) substrate. By using combination...
Changes in chemical and physical properties resulting from water adsorption play an important role the characterization performance of device-relevant materials. Studies model oxides with well-characterized surfaces can provide detailed information that is vital for a general understanding water-oxide interactions. In this work, we study single crystals indium oxide, prototypical transparent contact material heavily used wide range applications most prominently optoelectronic technologies....
Abstract Recently, a new magnetic phase called altermagnetism has been proposed, ushering in third distinct beyond ferromagnetism and antiferromagnetism. It is expected that this groundbreaking exhibits unique physical properties such as C-paired spin-valley locking, anomalous Hall effect, nontrivial Berry phase, giant magnetoresistance. Among all the predicted candidates, several room temperature altermagnets are suggested to host significant potential applications. Nevertheless, direct...
It is found that 1/3 monolayer (ML) of Sn forms a surface alloy with 2/3 ML Ag on Ag(111). This highly ordered layer shows $\sqrt{3}\ifmmode\times\else\texttimes\fi{}\sqrt{3}$ structure. By employing experimental and theoretical tools (scanning tunneling microscopy [STM], angle resolved photoelectron spectroscopy, low-energy electron diffraction, density functional theory), an atomic model has been obtained reproduces the electronic structure in both real reciprocal space. Detailed band...
Altermagnetism exhibits unique physical properties such as spin-momentum locking, anomalous Hall effect, nontrivial topological phase, and giant magnetoresistance. Among all the predicted candidates, several room-temperature altermagnets are suggested to host significant potential applications. <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:mrow><a:mi>Ru</a:mi><a:msub><a:mi mathvariant="normal">O</a:mi><a:mn>2</a:mn></a:msub></a:mrow></a:math> has been proposed most promising...
We report a study of the atomic and electronic structures ordered ${\mathrm{Ag}}_{2}\mathrm{Ge}$ surface alloy containing ⅓ monolayer Ge. Low-energy electron diffraction (LEED), scanning tunneling microscopy (STM), angle-resolved photoelectron spectroscopy (ARPES) data reveal symmetry breaking expected \ensuremath{\surd}3 \ifmmode\times\else\texttimes\fi{} periodicity, which is established for other ${\mathrm{Ag}}_{2}$$M$ alloys ($M$ = Bi, Sb, Pb, Sn). The deviation from simple structure...
The existence of a highly ordered, two-dimensional, $\mathrm{Sn}/\mathrm{Ag}$ alloy on Si(111) is reported in this study. We present detailed atomic and electronic structures the one layer thick alloy, exhibiting $2\ifmmode\times\else\texttimes\fi{}2$ periodicity. structure metallic due to free-electron-like surface band dispersing across Fermi level. By electron doping, can be converted into semiconducting state. A rotated Sn trimer constitutes key structural element that could identified...
Recently, a novel magnetic phase called altermagnetism has been proposed, ushering in third distinct beyond ferromagnetism and antiferromagnetism. It is expected that this groundbreaking exhibits unique physical properties such as C-paired spin-valley locking, anomalous Hall effect, nontrivial Berry phase, giant magnetoresistance, etc. Among all the predicted candidates, several room temperature altermagnets are suggested to host significant potential applications near future. Nevertheless,...
A totally anisotropic peculiar Rashba-Bychkov (RB) splitting of electronic bands was found on the Tl/Si(110)-(1×1) surface with C_{1h} symmetry by angle- and spin-resolved photoelectron spectroscopy first-principles theoretical calculation. The constant energy contour upper branch RB split band has a warped elliptical shape centered at k point located between Γ[over ¯] edge Brillouin zone, i.e., without time-reversal symmetry. spin-polarization vector this state is in-plane points almost...
Nickel oxide (NiO), deposited onto the strontium titanate (SrTiO3) (110)-(4 × 1) surface, was studied using photoemission spectroscopy (PES), X-ray absorption near edge structure (XANES), and low-energy He+ ion scattering (LEIS), as well scanning tunneling microscopy (STM). The main motivation for studying this system comes from prominent role it plays in photocatalysis. (4 reconstructed SrTiO3(110) surface previously found to be remarkably inert toward water adsorption under...
The Si(111) surface with an average coverage of slightly more than one monolayer Sn, exhibits a $2\sqrt{3}\ifmmode\times\else\texttimes\fi{}2\sqrt{3}$ reconstruction below 463 K. In the literature, atomic structure models 13 or 14 Sn atoms in unit cell have been proposed based on scanning tunneling microscopy (STM) results, even though only four could be resolved cell. This paper deals two issues regarding this surface. First, high-resolution angle-resolved photoelectron spectroscopy (ARPES)...
The pre-oxidized crystalline (3×1)-O structure of InAs(100) has been recently found to significantly improve insulator/InAs junctions for devices, but the atomic and formation this useful oxide layer are not well understood. We report high-resolution photoelectron spectroscopy analysis on InSb(100). findings reveal that consists In atoms with unexpected negative (between −0.64 −0.47 eV) only moderate positive (In2O type) core-level shifts; highly oxidized group-V sites; four different oxygen...
Metal deposition on oxide surfaces usually results in adatoms, clusters, or islands of the deposited material, where defects surface often act as nucleation centers. Here an alternate configuration is reported. After vapor Fe In_{2}O_{3}(111) at room temperature, ordered adatoms are observed with scanning tunneling microscopy. These identical to In that form when sample reduced by heating ultrahigh vacuum. Density functional theory calculations confirm interchanges topmost layer, pushing...
Advancement in nanotechnology to a large extent depends on the ability manipulate materials at atomistic level, including positioning single atoms active sites of surfaces interest, promoting strong chemical bonding. Here, we report long-time confinement Ag atom inside corner hole (CH) technologically relevant Si(111)-7×7 surface, which has comparable size as fullerene C60 molecule with dangling bond bottom center. Experiments reveal that set 17 stays entrapped CH for entire duration...
In this report, we explore the detailed structure of some InP-based core/shell quantum dots and highlight a complicated morphology.
Hydrogen, carbon, and oxygen are common unintentional impurities of Al(x)Ga(1–x)N crystals. This impurity structure its interplay with Mg in semiconductors relevant to develop the p-type nitride crystals for various devices (e.g, LEDs, transistors, gas sensors) but still unclear. Here we have investigated Mg-doped Al0.5Ga0.5N before after postgrowth annealing valence-band core-level photoelectron spectroscopy, photoluminescence, resistivity measurements. First, it is found that a surface...
We investigated the adsorption, diffusion, and clustering of Ag atoms on a Si(111)7 ×7 surface by scanning tunneling microscopy. The three kinds structure, i.e., monomers, dimers, clusters, were observed at coverage 0.02 monolayer atoms. In particular, dimers in unfaulted half unit cells (UHUCs) observed. found that monomers UHUCs jump to next HUCs with lifetime (5.6 ±0.4)×103 s. also measured height oscillation for cross section analysis proposed move along stable sites 0.5 ms.