Browsing Electronic & Electrical Eng by Subject "Condensed matter physics"
Now showing items 1-20 of 27
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Alignment instability caused by anchoring of the in-plane directors to the rubbing direction in the V-shaped switching
(2000)In order to investigate the molecular alignment in the smectic liquid crystals showing the V-shaped switching behavior, two types of the liquid crystal cells, a sandwiched cell and an open cell, were prepared. ... -
Antiferroelectric and ferroelectric orderings in frustrated chiral tilted smectics and a continuous change from anticlinic SmCA* to synclinic SmC*
(2010)In a frustrated binary-mixture system of ferroelectric and antiferroelectric liquid crystals, where the border line between SmCA* and SmC* in the temperature-concentration phase diagram runs almost parallel to the ordinate ... -
Characterisation of thin film silicon films deposited by plasma enhanced chemical vapour deposition at 162MHz, using a large area, scalable, multi-tile-electrode plasma source
(2011)Large area (600 ? 720 mm) depositions of hydrogenated microcrystalline silicon (?c-Si:H) have been achieved at high deposition rates using a scalable, multi-tile electrode topology. Depositions have shown local results of ... -
Classical quantum crossover in magnetic stochastic resonance in uniaxial superparamagnets
(2010)It is shown that the signal-to-noise ratio of the magnetic moment fluctuations in the magnetic stochastic resonance of a quantum uniaxial paramagnet of arbitrary spin value S subjected to a weak probing ac field H(t) = ... -
Composition and strain in thin Si1-xGex virtual substrates measured by micro-Raman spectroscopy and X-ray diffraction
(2011)Micro-Raman spectroscopy was employed for the determination of the germanium content, x and strain, , in ultrathin SiGe virtual substrates grown directly on Si by molecular beam epitaxy. The growth of highly relaxed ... -
Dielectric study of the electroclinic effect in the smectic-A phase
(American Physical Society, 1994)The dielectric properties of a smectic-A liquid crystal in the presence of a dc bias field are studied in the frequency range 100 Hz?1 MHz. It is shown that near the smectic-A?smectic-C* phase transition the relaxation ... -
Dissociative CdSe/ZnS quantum dot-molecule complex for luminescent
(2010)The optical properties of dissociative luminescent sensors based on a complex consisting of highly luminescent hydrophobic core/shell CdSe/ZnS quantum dots QDs and 1- 2-pyridilazo -2-naphtol PAN molecules in organic ... -
Dynamics of Collective and Molecular Modes of a Ferroelectric Liquid Crystal in Confined Geometry Using Dielectric Spectroscopy.
(American Physical Society, 1997)Two aerogel systems containing a ferroelectric liquid crystal (FLC) with smectic phases over a wider temperature range are investigated using dielectric spectroscopy. The second order transition from Sm- A to Sm-Cp is ... -
Effect of an oblique magnetic field on the superparamagnetic relaxation time
(American Physical Society, 1995)The effect of a constant magnetic field, applied at an angle to the easy axis of magnetization, on the Neel relaxation time of a single domain ferromagnetic particle (with uniaxial anisotropy) is studied by calculating the ... -
Effects of induced steric hindrance on the dielectric behavior and H bonding in the supercooled liquid and vitreous alcohol
(American Institute of Physics, 2001)The reasons of Debye-type dielectric relaxation in monohydroxy alcohols were investigated by studying the effects of steric hindrance on dielectric behavior and hydrogen bonding in alcohols. Broadband dielectric spectroscopy ... -
Electron-electron scattering in a double quantum dot: Effective mass approach
(American Institute of Physics, 2010)We present a theoretical description of the first-order scattering of interacting electrons and holes in a double quantum dot. Assuming infinitely high walls, strong confinement, and a two-band approximation, we derive ... -
The exponential dielectric relaxation dynamics in a secondary alcohol's supercooled liquid and glassy states
(2000)To gain insight into a recent observation that the prominent, Debye-type relaxation process observed for a primary alcohol may not be the a-relaxation process associated with molecular diffusion of a liquid @Europhys. ... -
Ferrielectric liquid crystal subphase studied by polarized Fourier-transform infrared spectroscopy
(American Physical Society, 2000)IR dichroism and the structure of a homogeneously aligned cell of a chiral smectic antiferroelectric liquid crystal (R)-1-methylheptyl 4-(4?-dodecyloxybiphenyl-4-ylcarbonyloxy)-3-fluorobenzoate [with acronym (R)-12OF1M7] ... -
Field-induced phase transitions in an antiferroelectric liquid crystal using the pyroelectric effect.
(American Physical Society, 2000)The antiferroelectric liquid crystal (AFLC) under investigation possesses different helical polar phases. Measurements of pyroelectric response of these phases as a function of temperature and bias field have elucidated ... -
Field-induced transformations in the biaxial order of non-tilted phases in a bent-core smectic liquid crystal
(Institute of Physics, 2010)The structural and electro-optic investigations of an achiral bent-core molecule in SmAPA phase, in which the polar directors in the neighboring layers are arranged anti-ferroelectrically, show that it undergoes transformation ... -
Investigation of germanium implanted with hydrogen for layer transfer applications
(2011)The technology for thin Ge layer transfer by hydrogen ion-cut process is characterised in this work. Experiments were carried out to determine suitable hydrogen ion implantation doses in germanium for the low temperature ... -
Macroscopic biaxiality and electric-field-induced rotation of the minor director in the nematic phase of a bent-core liquid crystal
(2010)Biaxiality in the nematic phase has been investigated for the bent-core liquid-crystal para-heptylbenzoate diester, using polarised IR spectroscopy. Anisotropic fluctuations of the nematic director are discussed in terms ... -
Microwave absorbent properties of nanosized cobalt ferrite powders prepared by coprecipitation and subjected to different thermal treatments
(Elsevier, 2011)Cobalt ferrite nanopowders were produced by means of two methods using a common precipitating agent. After precipitation, in the first method the cobalt ferrite was calcined, whilst in the second method the precipitation ... -
Molecular dynamics of iso-amyl bromide by dielectric spectroscopy, and the effects of a nonpolar solvent, 2-methylpentane, on the spectral features
(American Institute of Physics, 1999)To gain insight into the effects of the weakening of the electrostatic interactions on molecular dynamics when polar molecules are dissolved in a nonpolar solvent, the dielectric polarization and relaxation behaviors of ... -
Nonexponential dielectric relaxation dynamics in supercooled liquid and glassy states of isoamyl bromide and 2-methylpentane mixtures
(American Institute of Physics, 2001)The dielectric spectra of mixtures of the polar solute isoamyl bromide in 2-methylpentane have been investigated in the frequency range 1 mHz to 1 MHz and in the temperature range approaching the glass transition temperature. ...