Materials Literature
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We studied a metasurface constituted as a periodic array of semiconductor split-ring resonators. The resonance frequencies of the metasurface excited by normally incident light were found to be continuously tunable in the terahertz regime through an external magnetostatic field of suitable orientation. As such metasur…
We present zero field and transverse field muon spin relaxation experiments on the recently discovered Fe-based superconductor ${\mathrm{LaFeAsO}}_{1\ensuremath{-}x}{\mathrm{F}}_{x}$ ($x=0.075$ and $x=0.1$). The temperature dependence of the deduced superfluid density is consistent with a BCS $s$-wave or a dirty $d$-w…
Looking to the future: The decomposition in solution of a potential hydrogen-storage compound, ammonia borane (AB), was investigated by in situ 11B NMR spectroscopy and ex situ 15N NMR spectroscopy. The reaction was found to be second order in AB with an activation barrier of (25±2) kcal mol−1. The second-order kineti…
Tri-n-octylphosphine oxide (TOPO) is a commonly used solvent for nanocrystal synthesis. Commercial TOPO samples contain varying amounts of phosphorus-containing impurities, some of which significantly influence nanocrystal growth. Consequently, nanocrystal syntheses often give irreproducible results with different bat…
A new "on the fly" method to perform Born-Oppenheimer ab initio molecular dynamics (AIMD) is presented. Inspired by Ehrenfest dynamics in time-dependent density functional theory, the electronic orbitals are evolved by a Schroedinger-like equation, where the orbital time derivative is multiplied by a parameter. This p…
Nanoparticles of manganese ferrite were prepared by the chemical co-precipitation technique. The dielectric parameters, namely, real and imaginary dielectric permittivity (ε' and ε''), ac conductivity (σ ac ) and dielectric loss tangent (tanδ), were measured in the frequency range of 100 kHz–8 MHz at different tempera…
Low melting, highly luminescent: [C3mim][Eu(Tf2N)4] (1), [C4mim][Eu(Tf2N)4], and [C4mpyr]2[Eu(Tf2N)5] are the first lanthanide ionic liquids that do not need stabilization of the liquid state by neutral coligands. They show excellent photophysical properties, such as long lifetimes of luminescence at large EuIII conce…
Time reversal and negative refraction have been shown to be intimately linked processes. We propose a scheme that exploits transitions between positive and negative frequencies to mimic negative refraction at an interface and hence to make a negatively refracting lens. The theory applies equally to electromagnetic and…
Based on our first-principle calculations, ZnO doped by a nonmagnetic $2p$ light element (N) is predicted to be ferromagnetic. The local magnetic moments that are mainly localized on doped N atoms introduced total moments of $1.0{\ensuremath{\mu}}_{B}/\text{atom}$. The long-range magnetic coupling of N-doped ZnO can b…
Versatile and gigantic magnetoelectric (ME) phenomena have been found for a single crystal of ${\mathrm{DyFeO}}_{3}$. Below the antiferromagnetic ordering temperature of Dy moments, a linear-ME tensor component as large as ${\ensuremath{\alpha}}_{zz}\ensuremath{\sim}2.4\ifmmode\times\else\texttimes\fi{}{10}^{\ensurema…
Although the biological effects of some nanomaterials have already been assessed, information on toxicity and possible mechanisms of various particle types are insufficient. Moreover, the role of particle properties in the toxic reaction remains to be fully understood. In this paper, we aimed to explore the interrelat…
The dispersion behavior of graphene oxide in different organic solvents has been investigated. As-prepared graphite oxide could be dispersed in N, N-dimethylformamide, N-methyl-2-pyrrolidone, tetrahydrofuran, and ethylene glycol. In all of these solvents, full exfoliation of the graphite oxide material into individual…
Surface and material properties of dielectric Ga<sub>2</sub>O<sub>3</sub> thin films deposited onto GaAs substrate with different annealing temperature were studied via a variety of techniques, including X-ray diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS), scanning electron microscope (SEM) and energy disp…
The optical properties of the sandwich structures of Ag nanorod array (NRA)/dielectric layer/Ag mirror have been investigated theoretically and experimentally. Calculations based on a simple model by treating the NRAs as uniform effective media indicate that the antireflection condition is realized by changing the thi…
Color shift on off-axis angles is key issue of the cholesteric liquid crystal (CLC) polarizer. In this paper, color shift issues on various azimuthal and viewing angles of back light unit assembled with CLC polarizers are analyzed by optical simulation. We found that smaller NZ value of quarter-wave plate (QWP) of our…
DOI: 10.1002/macp.200800089 The author would like to announce the following corrections: An error was committed in plotting the original Figure 3; the correct version is shown hereunder, along with its corrected description. This replaces text starting on page 1046, left column, line 4 from the bottom, to the end of t…
Metallic nanoparticles embedded in dielectrics permit enhanced capture absorption and/or scattering of light at specific wavelengths through excitation of plasmons, i.e. the quanta of coherent and collective oscillations of large concentrations of nearly free electrons. In order to maximize the potential of such enhan…
Respiratory burst oxidase homologue (Rboh), which is found in the plasma membrane, is a generator of reactive oxygen species (ROS) in plants. Many studies have indicated that the ROS produced by Rboh play critical roles in various cellular activities, including plant defence against pathogens. Crystals of the N-termin…
One promising application of semiconductor nanostructures in the field of photovoltaics might be quantum dot solar concentrators. Quantum dot containing nanocomposite thin films are synthesized at EPFL-LESO by a low cost sol-gel process. In order to study the potential of the novel planar photoluminescent concentrator…
The results of dc and ac magnetization, electrical resistance, and heat-capacity studies in an admixed rare-earth alloy ${\text{Nd}}_{0.75}{\text{Gd}}_{0.25}{\text{Rh}}_{3}{\text{B}}_{2}$, which is close to the zero magnetization limit, are reported. Interesting observations include the two antiferromagneticlike trans…