Materials Literature
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Abstract Two linear, trinuclear mixed‐valence complexes, [Co II {(μ‐L 1 )(μ‐OAc)Co III (OAc)} 2 ] ( 1 ) and [Co II {(μ‐L 2 )(μ‐OAc)Co III (OAc)} 2 ] ( 2 ) and two mononuclear Co III complexes [Co III {L 3 }(OAc)] ( 3 ), and [Co III {L 4 }(OAc)] ( 4 ) were prepared and the molecular structures of 1 , 2 and 4 elucidated…
We demonstrate that SrRuO3 and CaRuO3 thin films undergo a room temperature structural phase transition driven by the substrate imposed epitaxial biaxial strain. As tensile strain increases, ARuO3 (A=Ca, Sr) films transform from the orthorhombic phase which is usually observed in bulk SrRuO3 and CaRuO3 at room tempera…
The electronic structure of a prototype dilute magnetic semiconductor (DMS), ${\mathrm{Ga}}_{1\ensuremath{-}x}{\mathrm{Mn}}_{x}\mathrm{As}$, is studied by magnetic circular dichroism (MCD) spectroscopy. We prove that the optical transitions originated from impurity bands cause the strong positive MCD background. The M…
Precession of magnetization induced by pulsed optical excitation is observed in a ferromagnetic semiconductor (Ga,Mn)As by time-resolved magneto-optical measurements. It appears as complicated oscillations of a polarization plane of linearly polarized probe pulses, but is reproduced by gyromagnetic theory incorporatin…
The formation and field response of head-to-head domain walls in curved permalloy wires, fabricated to contain a single anti-notch, have been investigated using Lorentz microscopy. High spatial resolution maps of the vector induction distribution in domain walls close to the anti-notch have been derived and compared w…
We report amplification of biomolecular recognition signal in lithographically defined silicon nanochannel devices. The devices are configured as field effect transistors (FET) in the reversed source-drain bias region. The measurement of the differential conductance of the nanowire channels in the FET allows sensitive…
We demonstrate radiation-pressure cavity-cooling of a mechanical mode of a micromirror starting from cryogenic temperatures. To achieve that, a high-finesse Fabry-Perot cavity (F\approx 2200) was actively stabilized inside a continuous-flow 4He cryostat. We observed optical cooling of the fundamental mode of a 50mu x…
Rigourous calculations of the imaging properties of metamaterials consisting of metal-coated semiconductor nanoparticles are presented. In particular, it is shown that under proper choice of geometric and materials parameters, arrays of such particles exhibit negative refractive index within the region of the excitoni…
We report on an efficient photonic-based method to prepare nanodot array of functional materials, independently of the nature of the substrate.
We propose a scheme for infrared single-photon detection based on two-photon absorption at room-temperature in Si avalanche photodiodes, where the detected photon's energy is lower than the bandgap and the energy difference is complemented by a pump field. A quantum non-perturbative model is developed for non-degenera…
Social networking: A variety of novel multicompartment nanostructures has been easily formed by combining the supramolecular aggregative properties of surfactants with low-molecular-weight hydrogelators that are based on 1,3,5-cyclohexyltricarboxamide (see picture, AA=amino acid). The resulting structures include self…
Silicon carbide (SiC) as both the most important non-oxide ceramic and promising semiconductor material grows stoichiometric SiO 2 as its native oxide. During passive oxidation, a surface transformation of SiC into silica takes place causing bulk volume and bulk mass increase. This review summarizes state-of-the-art i…
Because of the large spatial separation of the Mn atoms in Heusler alloys $({d}_{\mathrm{Mn}\text{\ensuremath{-}}\mathrm{Mn}}>4\phantom{\rule{0.3em}{0ex}}\mathrm{\AA{}})$, the $\mathrm{Mn}\phantom{\rule{0.2em}{0ex}}3d$ states belonging to different atoms do not overlap considerably. Therefore, an indirect exchange…
Most semiconductor devices are now packaged in an epoxy polymer composite, which includes silica powder filler for reducing the thermal expansion coefficient. However, increased heat output from near‐future semiconductors will require higher thermal conductivity fillers such as aluminum nitride (AlN) powder, instead o…
It loves LA! A unique chiral dinuclear indium complex 1 (see structure; In gray, Cl green, O red, N blue, C black) has been developed as a catalyst for the highly active, living ring-opening polymerization of lactide (LA). The catalyst retains the same reaction rate during two consecutive additions of lactide, and the…
High Resolution Image Download MS PowerPoint Slide 11 B NMR spectroscopy has been employed to identify the reaction intermediates and products formed in the amorphous phase during the thermal hydrogen desorption of metal tetrahydroborates (borohydrides) LiBH 4, Mg(BH 4 ) 2, LiSc(BH 4 ) 4, and the mixed Ca(AlH 4 ) 2 -L…
Amphiphilic polymer-coating for nanoparticles: The facile one-pot synthesis of a comblike polymer can be tailored in order to vary its hydrophobic side-chains or to directly incorporate functional molecules without the need for crosslinkers. This leads to a general and robust method of phase-transfer of hydrophobic na…
Transformation optics offers an unconventional approach to the control of electromagnetic fields. The transformation optical structures proposed to date, such as electromagnetic "invisibility" cloaks and concentrators, are inherently reflectionless and leave the transmitted wave undisturbed. Here, we expand the class…
The principal objective of this research is to de-termine the increase in service life of machine elements working under intensive abrasive wear conditions achieved by alloying. The worn plough points have been analyzed. The manufacture test results of the plough points alloyed with hard layers of different compositio…
We report current rectification in a junction between two different nanoparticles. A monolayer of p-type nanoparticles (PbSe or PbS) and a monolayer of n-type nanoparticles (CdSe or CdS) assembled in sequence form such a junction. Here the nanoparticles, which have been characterized following standard experimental me…