How to hide a dimension from view Compacted dimensions are essential ingredients of advanced string theories; the extra dimensions used to describe the world are hidden from view, or compacted. Pendry et al. used concepts of transformation optics, in which metamaterials are designed to produce specific optical properties, to show theoretically that compacted dimensions could be possible in plas...

We propose and optimize theoretically a supercontinuum (SC) laser source in the mid-IR based on using As-SeTe/As-S core/clad step-index fibers and a femtosecond all-fiber laser system at 2 μm. Numerically simulated spectra extending from ~1 μm to more than 8 μm are demonstrated for pump energy of order 100 pJ in a fiber with a core diameter of 2 μm. To the best of our knowledge, the possibility...

Decorating of Transition metals (TMs) on the "AlMg" nanoalloy has been studied basis Langmuir adsorption applying "ONIOM" model with three levels «high, medium and low» by using "LANL2DZ /6-31+G(d,p)/EPR-III", "semi-empirical" "MM2" functions. The fluctuation "NQR" estimated inhibiting role pyridine alkylpyridines containing 2-picoline (2Pic), 3-picoline (3Pic) ,4-picoline (4Pic), 2,4-lutidine ...

Scandium nitride (ScN) is a semiconducting transition metal nitride for which there are not identified dopants. We present local density functional calculations, in supercell approach, for ScN doped with O and C in N-sites and Ca and Ti in Sc-sites. Small additions of these atoms have the effect of shifting the Fermi level within the electronic band structure. O and Ti bring occupied states in ...

2014 Complex dielectric constant has been measured in the modulated phase of a OC(ND2)2-doped SC(ND2)2 single crystal. One can expect that the introduction of doping molecules strongly disturb the chains of hydrogen bonds in such a way that the modulated wave should be affected. In the incommensurate phase a new kind of memory effect is observed and when the variation of temperature is very slo...

First-principles simulations have been performed for [001]-ordered Mn/Ge and Mn/GaAs " digital alloys " , focusing on the effects of i) a larger band-gap and ii) a different semiconducting host on the electronic structure of the magnetic semiconductors of interest. Our results for the exchange constants in Mn/Ge, evaluated using a frozen-magnon scheme, show that a larger band-gap tends to give ...

The electron-doped cuprates are usually characterized by a more robust antiferromagnetic phase and much narrower superconducting (SC) dome than those of the hole-doped counterparts. Recently, bulk single crystals Pr1.3?xLa0.7CexCuO4?? (PLCCO) prepared protect annealing method have been studied extensively revealed many intriguing properties that were different from obtained samples annealed con...

It has long remained elusive whether ${\mathrm{CuCo}}_{2}{\mathrm{S}}_{4}$ thiospinel shows bulk superconductivity (SC). Here we clarify the issue by studying samples of sulfur-deficient ${\mathrm{CuCo}}_{2}{\mathrm{S}}_{3.7}$ and sulfurized ${\mathrm{CuCo}}_{2}{\mathrm{S}}_{4}$. The sample a smaller lattice constant $a=9.454$ \AA{}, it is not superconducting down to 1.8 K. After full sulfuriza...