Showing papers in "Solid State Communications in 1997"

TL;DR: In this paper, room temperature free excition absorption and luminescence were observed in ZnO thin films grown on sapphire substrates by the laser molecular beam epitaxy technique.

TL;DR: In this paper, the authors present an overview of femtosecond-pulse generation of coherent optical phonons, focusing on Raman mechanisms for the coherent driving force providing a comprehensive approach for the description of both below-gap and resonant excitation.

TL;DR: In this article, the elastic behavior of open-ended, free-standing, single wall, carbon nanotubes is investigated by a Tersoff-Brenner potential, and typical failure modes as well as stress-strain curves for a number of tube radii are shown.

TL;DR: In this article, it was shown that the optical transitions in ZnO and GaN appear to derive from a similar origin and have considerable overlap in the energy regions where they occur.

TL;DR: The most advanced organic light emitting diode (LED) technology has reached a point where performance levels are adequate for a number of applications as discussed by the authors, and a review examines the key scientific issues that underlie the operation of such LEDs.

TL;DR: In this paper, molecular dynamics simulations of nonequilibrium heat flow in a solid system in the local-equilibrium or hydrodynamic approximation were performed and it was shown that local equilibrium can be achieved in small numbers of atomic layers over long simulation runs.

TL;DR: The magnetic properties of Ca 3 Co 2 O 6 have been studied by magnetic susceptibility and neutron diffraction methods from 5 K to room temperature as discussed by the authors, and an effective magnetic moment of 5.7±0.2 μ B was found.

TL;DR: In this article, high brightness InGaN singlequantum-well structure (SQW) blue and green light-emitting diodes (LEDs) with luminous intensities of 2 cd and 10 cd have been achieved and commercialized.

TL;DR: In this paper, the pseudopotential total energy of graphitic carbon nitride is investigated by means of first principles pseudoprocessor total energy calculation, and the stability of single layers of C3N4 and CN is examined by geometrical optimization and phonon frequencies.

TL;DR: In this article, the possible mechanisms responsible for ferromagnetic ordering in transition metal oxides and the interplay between electrical transport and magnetic order are discussed, emphasizing the role of orbital degrees of freedom, electron correlation effects, local lattice distortions and the oxygen 2 p bands in high oxidation state TM oxides.

TL;DR: In this article, the photoluminescence spectra of Si nanocrystals embedded in SiO 2 films were measured as a function of the size of the particles and a broad PL peak was observed in the near-infrared region.

TL;DR: Ab initio molecular dynamics (AIMD) as discussed by the authors is based on density functional theory, plane wave expansion and pseudopotentials, which allows simulation of complex many-body systems without adjustable parameters.

TL;DR: In this article, the authors investigate polariton states in a cavity containing organic and inorganic quantum wells (QW) when the energies of 2D Frenkel exciton in the organic QW and of a semiconductor Wannier exciton are near the energy of the cavity optical mode.

TL;DR: In this paper, the magnetic and transport properties of a series of Ga 1−x Mn x As GaAs samples with different Mn concentrations (x = 0.015−0.071) were studied.

TL;DR: In this article, the photochromic and electrochromic (EC) behavior of sputtered tungsten oxide (WO3−y) films with different oxygen deficiency was investigated.

TL;DR: In this paper, the symmetry of the phases in disordered perovskite has been investigated using X-ray and synchrotron radiation, showing that the compound is a monoclinic ferroelectric at 293 K, undergoes a structural transition to another tetragonal state at about 355 K and finally transforms into a cubic form at approximately 376 K.

TL;DR: In this article, the authors present and discuss the Ti 2p and O 1s X-ray absorption spectra and resonant photoelectron emission spectra (RPES) of the various polymorphic forms (TiO2-II, rutile and anatase) of TiO2.

TL;DR: In this paper, the superconducting gap for 2D electron gas in a superlattice of quantum stripes with a finite 1D periodic potential barrier was calculated and the resonant enhancement of the gap was found when the Fermi level was tuned near the bottom of the nth super-link subband with n ≥ 2.

TL;DR: In this article, the state-of-the-art performance of quantum cascade laser has been evaluated using MBE grown AlInAs GaInAs heterostructures and the operating wavelength has been extended to 11 μm.

TL;DR: In this paper, the magnetic properties of polycrystalline manganite oxides were studied and the effect of grain boundary resistivity on low-field magnetoresistance was investigated.

TL;DR: In this article, an electron spectroscopy study of the development of the electronic structure in the K-doped C60 monolayer on a Ag(1 1 1) surface is presented.

TL;DR: In this paper, the Raman spectra of polycrystalline samples of CH3NH3PbCl3 were studied at temperature ranging from 80 K to 300 K and an assignment of most of the observed bands was proposed.

TL;DR: In this paper, the phase transition from the cubic modification (as-grown sample) to hexagonal phase (annealed at highest temperature samples) has been observed at around 300°C.

TL;DR: In this paper, a theory of the Zeeman splitting of electronic spin states in biased quantum-well structures has been developed and the g factor tensor has been calculated as a function of the applied electric field and the well width.

TL;DR: In this paper, temperature-dependent mobility μ and carrier concentration n data are simultaneously fitted in a high-quality, n-type GaN layer with wurtzite structure grown by metalorganic chemical vapor deposition.

TL;DR: In this paper, a concept of random spatial fluctuations in the potential landscape of disordered semiconductors is employed to explain the effect of suppressed charge carrier recombination in these materials, and the rate of bimolecular recombination is anomalously low due to spatial separation of electrons and holes in the fluctuating potential landscape.

TL;DR: In this paper, the authors report progress in the processing and application of poly(phenylene vinylene), PPV, as the emissive layer in electroluminescent diodes, LEDs.

TL;DR: In this article, a single crystal of black phosphorus has been carried out at room temperature in a wide pressure range from 0.55 to 13 GPa in order to study a band overlapped metallization at 1.5 GPa and structural phase transitions.

TL;DR: In this article, the Curie constant values indicate that in this glass system the iron ions are in both Fe3+ and Fe2+ valence state, the last one representing about 56% from the total iron ions content.

TL;DR: In this article, low frequency dielectric permittivity measurements were performed on the KDP nanosize particles system, where highly dispersed objects were obtained by introducing of ferroelectric material into the pores of different dielectrics matrixes.