Materials Literature
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A formulation is developed for the calculation of the electromagnetic--fluctuation forces for dielectric objects of arbitrary geometry at small separations, as a perturbative expansion in the dielectric contrast. The resulting Lifshitz energy automatically takes on the form of a series expansion of the different many-…
Electrons with spin-orbit coupling moving in mesoscopic structures can often exhibit local spin polarization. In this paper, we study the influence of the Rashba coupling on the scattering of two-dimensional electrons from a circular disk. It is observed that spin-polarized regions exist, even if the incident electron…
We develop an analytic and environment-dependent interatomic potential for the overlap repulsion in solid argon, based on an approximate treatment of the non-orthogonal Tight-Binding theory for the closed-shell systems. The present model can well reproduce the observed elastic properties of solid argon including Cauch…
The vibrational properties of a high-quality realistic model of amorphous silicon are examined. The longitudinal and transverse dynamical structure factors are calculated, and fitted to a damped harmonic oscillator (DHO) function. The width $Γ$ of the best-fit DHO to the longitudinal dynamical structure factor scales…
Atomic-resolution electron microscope images show that a quasicrystal is a quasiperiodic packing of clusters. The outer atomic shells of multi-shell clusters occuring in quasicrystals are highly symmetric and rather robust, but some structural disorder may be present around the core. The models describing quasicrystal…
We use our recently proposed microscopic modeling in the framework of linear response theory to investigate the complete phonon dispersion, the phonon density of states, certain phonon-induced electronic charge distributions and charge fluctuations (CF's) for anomalous soft modes of metallic BaBiO$_{3}$ in its simple…
Abstract Core/shell nanoparticles that display a pH‐sensitive thermal response, self‐assembled from the amphiphilic tercopolymer, poly( N ‐isopropylacrylamide‐ co‐N , N ‐dimethylacrylamide‐ co ‐10‐undecenoic acid) (P(NIPAAm‐ co ‐DMAAm‐ co ‐UA)), have recently been reported. In this study, folic acid is conjugated to t…
CeO 2 spherical crystallites aggregated by small CeO 2 nanoparticles in the diameter range of 5−10 nm were successfully fabricated through a facile surfactant-assisted hydrothermal method. PVP (poly(vinylpyrrolidone)) was applied as surfactant to facilitate the oriented aggregation of small CeO 2 nanoparticles into sp…
The absorption and emission spectra of silicon nanocrystals up to $1\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$ diameter have been calculated within a first-principles framework. Our calculations include geometry optimization and the many-body effects induced by the creation of an electron-hole pair. Starting from hydroge…
We propose a new method to control the roughness of a growing surface, via a time-delayed feedback scheme. As an illustration, we apply this method to the Kardar-Parisi-Zhang equation in 1+1 dimensions and show that the effective growth exponent of the surface width can be stabilized at any desired value in the interv…
Light emission from nanostructures exhibits rich quantum effects and has broad applications. Single-walled carbon nanotubes (SWNTs) are one-dimensional (1D) metals or semiconductors, in which large number of electronic states in a narrow range of energies, known as van Hove singularities, can lead to strong spectral t…
A self-assembly process with no external template and no added acidic dopant is reported as a method providing quantitative control over the diameter d of the polyaniline (PANI) nanofibers produced. An experimental formula relating d to the standard redox potential of the oxidants is established. The PANI nanofibers i…
The electronic structure of the superconducting material LaOFeP is investigated by means of ab initio calculations using density functional theory. The concept of two-dimensional building blocks as well as Bader analysis are used to obtain more insight about the charge transfer in this layered material. The band struc…
Gold nanorods coated with cetyltrimethylammonium bromide (CTAB), a cationic micellar surfactant used in nanorod synthesis, were rapidly and irreversibly internalized by KB cells via a nonspecific uptake mechanism. Internalized nanorods near the cell surface were monitored by two-photon luminescence (TPL) microscopy an…
A theory for the vibrational dynamics in disordered solids [W. Schirmacher, Europhys. Lett. 73, 892 (2006), based on the random spatial variation of the shear modulus, has been applied to determine the wave vector (k) dependence of the Brillouin peak position (Omega(k)) and width (Gamma(k)), as well as the density of…
Type Ib diamonds emit bright fluorescence at 550-800 nm from nitrogen-vacancy point defects, (N-V)(0) and (N-V)(-), produced by high-energy ion beam irradiation and subsequent thermal annealing. The emission, together with noncytotoxicity and easiness of surface functionalization, makes nano-sized diamonds a promising…
A lyotropic liquid-crystal-templated superlattice of inorganic CdSe semiconductor nanostructures within an organic semiconductor polymer-network film was fabricated by a self-assembly process. The film is characterized with small-angle x-ray diffraction experiments and ultraviolet-visible absorption measurements. Empi…
Recently reported [C. Filipi\ifmmode \check{c}\else \v{c}\fi{} and A. Levstik, Phys. Rev. B 73, 092104 (2006)] and reinforced [J. F. Scott et al., J. Phys.: Condens. Matter 18, L205 (2006)] critical exponents $\ensuremath{\gamma}=1.0$ and $\ensuremath{\beta}=0.5$ of the isotope-substituted ferroelectric $\mathrm{Sr}\m…
An unusual phase has recently been observed in the organic material $(\mathrm{TMTSF}{)}_{2}{\mathrm{PF}}_{6}$, where superconductivity (SC) may coexist with spin-density wave (SDW) in the whole pressure interval ${p}_{c1}<p<{p}_{c}$ below the first order transition into SC or normal metal phase. Assuming that th…
Self-assembled In1−xMnxAs quantum dots (0.19⩽x⩽0.45) have been grown on GaAs (100) substrates by low-temperature molecular beam epitaxy. The microstructure analysis revealed that the uniformly distributed In1−xMnxAs dots have a zinc blende structure as x⩽0.38. Furthermore, all samples exhibit ferromagnetic state at 5K…