Materials Literature
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Chiral tunneling through a harmonically driven potential barrier in a graphene monolayer is considered in this work. Since the charge carriers in this system are massless, chiral Dirac particles, tunneling is described as Klein tunneling and is highly anisotropic. To study Klein tunneling through a harmonically driven…
Assembling [W(CN) 6(bpy)] (-) and magnetic anisotropic Mn Schiff bases produced two Mn (III)(3d)-W (V)(5d) bimetallic chains. Modulation of the types and degrees of interchain pi-pi interactions in the one-dimensional coordination polymers leads to the variation of the magnetic behavior from a metamagnetic character t…
From a suitably broad perspective, transition metal corroles may be viewed as stable, synthetic analogues of high-valent heme protein intermediates such as compounds I and II. Against this backdrop, the electronic structure of chloroiron corrole has provoked a lively debate in recent years. Thus, whereas NMR spectrosc…
The effects of treatment with hydrochlorothiazide combined with amiloride were compared to hydrochlorothiazide treatment alone in 2 brothers with congenital nephrogenic diabetes insipidus. Whereas both modalities of treatment resulted in reduction in voiding frequency and urine volume, decrease in daily fluid intake a…
The terrace formation behavior of chloroform vapor annealed thin films of asymmetric, low molecular weight comb-shaped supramolecules consisting of a short polystyrene (PS) block and a long supramolecular block of poly(4-vinylpyridine) (P4VP) hydrogen bonded with pentadecylphenol (PDP) on silicon oxide (SiO 2 ) was ex…
The dynamical behavior of the magnetism of diluted magnetic semiconductors (DMSs) has been investigated by means of atomistic spin-dynamics simulations. The conclusions drawn from the study are argued to be general for DMS systems in the low-concentration limit, although all simulations are done for 5% Mn-doped GaAs w…
Gold growth onto CdSe seeded CdS nanorods is studied. Preferential growth of gold onto the position of the CdSe seed is identified. The mechanism of growth is assigned to an electrochemical Ostwald ripening process.
We report approximately 22 dB of Raman gain in single mode As(2)Se(3) chalcogenide glass fiber using 15 ps optical pump pulses from 1470 nm to 1560 nm. We employ a novel technique of cross-phase modulation induced sideband amplification to map out the Raman gain spectrum of this glass, and investigate the role of both…
We present the results of numerical simulations of a $(2+1)$-dimensional fermion field theory based on a recent proposal for a model of graphene consisting of ${N}_{f}$ four-component Dirac fermions moving in the plane and interacting via an instantaneous Coulomb interaction. In the strong-coupling limit we identify a…
Monodisperse spherical hollow nanoparticles of mesoporous silica featuring mesopores with a radial orientation in the silica shell were synthesized via a dual-templating method. Specifically designed polystyrene latexes with anionic or cationic surface charges acted as the core templates, while cetyltrimethylammonium…
We report the synthesis of Tm 3+ /Yb 3+ /Er 3+ -doped Lu 3 Ga 5 O 12 nanocrystals prepared by a simple sol−gel method exhibiting bright white light following excitation with lower energy near-infrared light (λ exc = 980 nm) via an upconversion process. The combination of upconverted blue (from Tm 3+ ), green, and red…
We report the design, fabrication and optical investigation of electrically tunable single quantum dot - photonic crystal defect nanocavities operating in both the weak and strong coupling regimes of the light matter interaction. Unlike previous studies where the dot-cavity spectral detuning was varied by changing the…
We present a combination of ab initio calculations, magnetic Compton scattering and polarized neutron experiments, which elucidate the density distribution of unpaired electrons in the kagome staircase system Co3V2O8. Ab initio wave functions were used to calculate the spin densities in real and momentum space, which…
We investigate vibration modes and their Raman activity of single-walled carbon nanotubes that are bent within their intrinsic elastic limits. By implementing wedge boundary conditions for density-functional-based tight binding, and using nonresonant bond polarization theory, we discover that Raman activity can be ind…
A cell dynamics method for domain separation of diblock copolymers (DBCPs) interacting with nanoparticles (NPs) whose diffusion coefficients depend on chain configuration is proposed for self-assembly of DBCP/NP composites. Increasing NP concentration slows down domain separation, but matching NP diffusion lengths and…
Near ballistic n-type single-walled carbon nanotube field-effect transistors (SWCNT FETs) have been fabricated with a novel self-aligned gate structure and a channel length of about 120 nm on a SWCNT with a diameter of 1.5 nm. The device shows excellent on- and off-state performance, including high transconductance of…
We demonstrate that optical illumination strongly influences spin transport in n-type GaAs. Specifically, increasing the power density of optical spin pumping results in a significant expansion of the spin diffusion profile. A further means of manipulation is the application of a weak transverse magnetic field, which…
Within investigating the multiple charge spreading generalizing the Bertaut approach, a set of confined spreading functions with a polynomial behaviour, but defined so as to enhance the rate of convergence of Coulomb series even upon a single spreading, is proposed. It is shown that multiple spreading is ultimately ef…
We investigate the structure and mechanical behavior of assemblies of frictionless, nearly rigid equal-sized beads, in the quasistatic limit, by numerical simulation. Three different loading paths are explored: triaxial compression, triaxial extension and simple shear. Generalizing recent results [1], we show that the…
We report the first measurements of effects of large current densities on current-perpendicular-to-plane magnetoresistance (MR) of magnetic multilayers containing two antiferromagnetic layers separated by a non-magnetic layer. These measurements were intended to search for a recently predicted antiferromagnetic giant…