Materials Literature
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In this paper, the fluorescence behaviour of nano colloids of ZnO has been\nstudied as a function of the excitation wavelength. We have found that\nexcitation at the tail of the absorption band gives rise to an emission that\nshifts with the change of the excitation wavelength. The excitation\nwavelength dependent shi…
Abstract It has been commonly thought that diamond is unique in its class in that it can undergo p‐type transfer doping when covered by a thin layer of electrolyte. In this study, density‐functional theory has been used to show that the work functions of graphite and graphene are low enough for transfer doping to occu…
Adsorption of chemical species H, O, CO, H 2, O 2, H 2 O, and NH 3 on the sidewall of zigzag (8,0) and armchair (5, 5) boron nitride nanotubes (BNNTs) is studied using density-functional theory. Particular attention is paid to searching for the most-stable configuration of the adsorbates at a perfect site (PS) and nea…
Hedin's equations for the electron self-energy and the vertex were originally derived for a many-electron system with Coulomb interaction. In recent years it has been increasingly recognized that spin interactions can play a major role in determining physical properties of systems such as nanoscale magnets or of inter…
Carbon nanotubes were synthesized by thermal arc plasma process after optimization of the synthesis parameters. These samples were then analysed by scanning and transmission electron microscopes (SEM and TEM), in order to establish the morphology of the nanostructures. Atomic force microscopy (AFM) and electron diffra…
Abstract In this paper we present our recent results on the production of primary particles of detonation diamond from strongly bound agglomerates using beads milling and the newly developed BASD (bead assisted sonic disintegration) method in various media. Additionally, the surface functionalisation starting from hyd…
Recently, we have predicted [Phys. Rev. Lett. 97, 226102 (2006)] that a single ethylene molecule can form stable complexes with light transition metals (TMs) such as Ti and the resulting ${\mathrm{TM}}_{n}$-ethylene complex can absorb up to $\ensuremath{\sim}12$ and $14\phantom{\rule{0.3em}{0ex}}\mathrm{wt}\phantom{\r…
Neutron and x-ray diffraction techniques have been used to study the competing long- and short-range polar order in the relaxor ferroelectric $\mathrm{Pb}({\mathrm{Mg}}_{1∕3}{\mathrm{Nb}}_{2∕3}){\mathrm{O}}_{3}$ (PMN) under a [111] applied electric field. Despite reports of a structural transition from a cubic phase t…
We studied the low temperature (T<130K) growth of Ag on Si(001) and Si(111) flat surfaces prepared by Si homo epitaxy with the aim to achieve thin metallic films. The band structure and morphology of the Ag overlayers have been investigated by means of XPS, UPS, LEED, STM and STS. Surprisingly a (root3xroot3)R30^o LEE…
We performed optical-pump terahertz-probe measurements of a Mott insulator YTiO$_{3}$ and a band semiconductor Si using a laser diode (1.47 eV) and a femtosecond pulse laser (1.55 eV). Both samples possess long energy-relaxation times (1.5 ms for YTiO$_{3}$ and 15 $μ$s for Si); therefore, it is possible to extract ter…
Mapping energy transformation pathways and dissipation on the nanoscale and understanding the role of local structure on dissipative behavior is a challenge for imaging in areas ranging from electronics and information technologies to efficient energy production. Here we develop a novel Scanning Probe Microscopy (SPM)…
We demonstrate an electric-field control of tunneling magnetoresistance (TMR) effect in a semiconductor quantum-dot (QD) spin-valve device. By using ferromagnetic Ni nano-gap electrodes, we observe the Coulomb blockade oscillations at a small bias voltage. In the vicinity of the Coulomb blockade peak, the TMR effect i…
Embedding a thermoelectric generator (TEG) in a biological body is a promising way to supply electronic power in the long term for an implantable medical device (IMD). The unique merit of this method lies in its direct utilization of the temperature difference intrinsically existing throughout the whole biological bod…
The mixed spin-1/2 and spin-S (S>1/2) Ising model on a rope ladder is examined by combining two exact analytical methods. By the decoration-iteration mapping transformation, this mixed-spin system is firstly transformed to a simple spin-1/2 Ising model on the two-leg ladder, which is then exactly solved by the standar…
The martensitic transition, magnetocaloric effect (MCE) and shape memory effect (MSE) of ferromagnetic Heusler alloys Ni 50 Mn 50− x Sb x ( x = 12, 13 and 14) have been investigated. A large positive magnetic entropy change Δ S M was observed in the vicinity of the martensitic transition. The maximum value of Δ S M is…
Using a 2D model of capacitively coupled Josephson junction arrays (created by a network of twin boundary dislocations with strain fields acting as an insulating barrier between hole-rich domains in underdoped crystals), we study the influence of chemical pressure on nonlinear thermal conductivity (NLTC) of an intrins…
Magnetoelectric (ME) voltage coefficient was always considered independent on in-plane shape of plate layered magnetostrictive-piezoelectric composites due to the oversimplification in ME theoretical models. In this article, we present that in fact the ME voltage coefficient is largely dependent on the in-plane shape…
The thermal characteristics of silicon between 15 and 300 deg K are investigated by applying a computer program on the solution of the differential heat diffusion equation. The computer model is linked to high-purity silicon through a set of experimental data. The numerical results are given in graphic form and show,…
Using electron-phonon mechanism, we explains very well the spatial anti-orrelation between the energy-gap and the energy of phonon mode for cuprate superconductor found in d^2I/dV^2 spectrum by STM measurements [Jinho Lee, et.al Nature {\bf 442},546 (2006)], which is the direct effect of a relation $M<ω^{2}>λ=const$.…
While actin bundles are used by living cells for structural fortification, the microscopic origin of the elasticity of bundled networks is not understood. Here, we show that above a critical concentration of the actin binding protein fascin, a solution of actin filaments organizes into a pure network of bundles. While…