Materials Literature
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Rigorous coupled spin-charge drift-diffusion equations are derived from quantum-kinetic equations for the spin-density matrix that incorporate effects due to k-linear spin-orbit interaction, an in-plane electric field, and the elastic scattering on nonmagnetic impurities. The explicit analytical solution for the induc…
The results of the quantitative investigations of the renormalization of the absorption edge of different compounds by the isotope effect are described.
Dielectric relaxation is universal in characterizing polar liquids and solids, insulators, and semiconductors, and the theoretical models are well developed. However, in high magnetic fields, previously unknown aspects of dielectric relaxation can be revealed and exploited. Here, we report low-temperature dielectric r…
Here we report a photoemission study of the Fe intercalation underneath a graphene layer on Ni(111). The process of intercalation was monitored by means of x-ray photoemission of corresponding core levels as well as ultraviolet photoemission of the graphene-derived π states in the valence band. Thin fcc Fe layers (2–5…
A novel full-color-emitting phosphor composed of B, C, N, and O atoms is prepared by a one-step solution process from inexpensive precursors at ambient atmosphere and relatively low temperatures (below 900 °C). Emission from this novel phosphor can be tuned from the violet to the near-red, as illustrated in the figure…
Hydrogen chemisorption on graphene receptor-substrate is of great interest for energy storage. However, it is difficult to reconcile with a single H atom binding to carbon being weaker than it is within initial molecular ${\text{H}}_{2}$. This paradox is resolved by presenting the process as phase nucleation in the re…
Photoalignment possesses significant advantages in comparison with the usual rubbing treatment of the substrates of liquid crystal display (LCD) cells as it is a non-contact method with a high resolution. A new technique recently pioneered by the authors of this book, namely the photo-induced diffusion reorientation o…
A small fraction of phosphorus (up to 10%) was incorporated in ferromagnetic (Ga,Mn)As epilayers grown on a GaAs substrate. P incorporation allows reducing the epitaxial strain or even change its sign, resulting in strong modifications of the magnetic anisotropy. In particular a reorientation of the easy axis toward t…
The results of a quantitative study of the renormalization of the binding energy of the Wannier-Mott exciton by the isotope effect are presented.
Crystalline Si substrates are studied for pressure induced phase transformation under indentation at room temperature using Berkovich tip. Raman scattering study is used for the identification of the transformed phases. Raman line as well as area mapping are used for locating the phases in the indented region. Calcula…
By substituting Sn for Sb, the potential of stable (Zr,Hf)Co(Sb,Sn) half-Heusler phases, as p-type thermoelectric materials, for high-temperature power generation has been examined. Sn concentration as much as ∼20%–30% is required to realize high power factor values. Substitution of heavier Hf, which reduces the therm…
In this paper the authors show that nanostructured commercial purity titanium produced by severe plastic deformation (SPD) opens new avenues and concepts for medical implants, providing benefits in all areas of medical device technology.
Large-area, well-aligned ZnO/ZnSe core/shell nanowire arrays are synthesized directly on a transparent conducting oxide substrate. HRTEM reveals that ZnO and ZnSe have wurtzite and zinc blend crystal structures, respectively (see figure), the interface is smooth with no transitional layer, and ZnSe grows epitaxially o…
We demonstrate a metamaterial device whose far-infrared resonance frequency can be dynamically tuned. Dynamic tuning should alleviate many bandwidth-related roadblocks to metamaterial application by granting a wide matrix of selectable electromagnetic properties. This tuning effect is achieved via a hybrid-metamateria…
Abstract Hierarchically structured metal oxides have two or more levels of structure. Their nanometer‐sized building blocks provide a high surface area, a high surface‐to‐bulk ratio, and surface functional groups that can interact with, e.g., heavy metal ions. Their overall micrometer‐sized structure provides desirabl…
Abstract Magnesium alloys are very biocompatiable and show promise for use in orthopaedic implant. Significant progress of research on bioabsorbable magnesium stents and orthopaedic bones has been achieved in recent years. The issues on degradation, hydrogen evolution, and corrosion fatigue and erosion corrosion of ma…
We have performed a high-resolution angle-resolved photoelectron spectroscopy study on the newly discovered superconductor Ba 0.6 K 0.4 Fe 2 As 2 ( T c =37 K). We have observed two superconducting gaps with different values: a large gap (Δ∼12 meV) on the two small hole-like and electron-like Fermi surface (FS) sheets,…
We report measurements of the thermal conductivity of high-quality crystals of the cubic $\mathrm{I}\mathrm{\text{\ensuremath{-}}}\mathrm{V}\mathrm{\text{\ensuremath{-}}}{\mathrm{VI}}_{2}$ semiconductors ${\mathrm{AgSbTe}}_{2}$ and ${\mathrm{AgBiSe}}_{2}$. The thermal conductivity is temperature independent from 80 to…
Silicon immersion grating have opened the new possibilities of building compact high-resolution cryogenic spectrometers for the near-infrared (NIR) region from 1.4 to 5.5μm. We are developing a silicon immersion grating for a next-generation NIR high-resolution spectrometer attached to the Subaru 8.2 m telescope. S…
The Visible Integral-field Replicable Unit Spectrograph Prototype (VIRUS-P) has been in operation on the Harlan J Smith 2.7m Telescope at McDonald Observatory since October of 2006. The prototype was created to test the design and science capabilities of the full VIRUS instrument, wherein 150 copies of the spectrograp…