The dynamical behavior of the one-dimensional quantum sine-Gordon system with a misfit parameter is investigated at a particular value of the quantum parameterg2=4π. For this purpose the dynamical correlation functio...
The dynamical behavior of the one-dimensional quantum sine-Gordon system with a misfit parameter is investigated at a particular value of the quantum parameterg2=4π. For this purpose the dynamical correlation functions are calculated by using the Fermi-Bose relation. From the behavior of the displacement correlation function we find that the thermal velocity is given by ∼√T/m0in the commensurate state (m0-| µ 8730|≫T) or in the cross-over region (m0≃| µ \tilde |≫T) and approaches value 1 asTor | µ \tilde | is increased. Herem0and µ \tilde, respectively, are the gap and the chemical potential in the corresponding fermion system. For the case of denity-density correlation function, we give in the commensurate state expressions which are similar to those derived on the basis of the soliton phenomenology in the classical system. A particular case of the density-density correlation function is discussed in detail by following another route.
It is shown that the plasma parameter obtained by fitting the presently available one-component-plasma structure factors to the real structure factors of the alkali liquids cannot be reasonably reproduced by existing ...
It is shown that the plasma parameter obtained by fitting the presently available one-component-plasma structure factors to the real structure factors of the alkali liquids cannot be reasonably reproduced by existing variational thermodynamic calculations, even using a very accurate pseudopotential theory. The implications of this discrepancy are discussed.
Raman and far-infrared spectra of crystalline fluoroform at temperatures between 20 and 106 K have been recorded. There is no evidence for any solid-state phase transitions, nor for hydrogen bonding. The rich lattice ...
Raman and far-infrared spectra of crystalline fluoroform at temperatures between 20 and 106 K have been recorded. There is no evidence for any solid-state phase transitions, nor for hydrogen bonding. The rich lattice spectra and crystal field splittings suggest that the unit cell is rather large, and possible structures are discussed.
The dynamical correlation functions for the 1-D quantum sine-Gordon system withg2=4π are investigated analytically (g2is the quantum parameter). Following a microscopic approach using the fermibose relation, general ...
The dynamical correlation functions for the 1-D quantum sine-Gordon system withg2=4π are investigated analytically (g2is the quantum parameter). Following a microscopic approach using the fermibose relation, general expressions valid at all temperatures are derived. The high and low temperature limits of the correlation functions are given explicitly.
The results of scanning a finely collimated beam of 5.9 keV X-rays across the faces of three different Si(Li) X-ray detectors are interpreted in terms of an active area of good charge collection and peripheral regions...
The results of scanning a finely collimated beam of 5.9 keV X-rays across the faces of three different Si(Li) X-ray detectors are interpreted in terms of an active area of good charge collection and peripheral regions of incomplete charge collection, both within the manufacturers' stated areas. The data are correlated with absolute efficiencies determined using calibrated radionuclide X-ray ernitters. The hazards of spectral artefacts from the imperfect regions in the contexts of XRF and PIXE are stressed.
The structure factor for liquid chlorine on the coexistence curve at room temperature (296 K) was measured out to a q of 11 Å −1 using neutrons of 88 meV. The inelasticity correction to the differential scatterin...
The structure factor for liquid chlorine on the coexistence curve at room temperature (296 K) was measured out to a q of 11 Å −1 using neutrons of 88 meV. The inelasticity correction to the differential scattering cross section included terms due to the excitation of molecular vibrations which were important at large q . Comparisons were made to other published results for S ( q ) and some differences were noted, especially at low q and in the peak heights.
The Scanning Laser Microscope at the University of waterloo is described, with experimental results from the areas of semiconductor characterization and device testing. Minority carrier diffusion length measurements u...
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The Scanning Laser Microscope at the University of waterloo is described, with experimental results from the areas of semiconductor characterization and device testing. Minority carrier diffusion length measurements using two different experimental geometries are described and compared with scanning electron microscope EBIC measurements. Both minority carrier diffusion length and surface recombination velocity measurements in polycrystalline semiconductors are reported from measurement of spatially-resolved photoconductivity along the length of a polycrystalline sample.
With the help of a suitable example we demonstrate the importance of the choice of the dynamical algebra in finding the invariants of time-dependent hamiltonians. Several cases of time-dependent oscillators are discus...
With the help of a suitable example we demonstrate the importance of the choice of the dynamical algebra in finding the invariants of time-dependent hamiltonians. Several cases of time-dependent oscillators are discussed briefly illustrating the algebraic method of finding the invariants.
An apparatus is described for measuring Seebeck coefficients in semiconducting thin‐film samples with resistances as high as 101 1 Ω. A temperature gradient ΔT is produced across the sample by means of differential...
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An apparatus is described for measuring Seebeck coefficients in semiconducting thin‐film samples with resistances as high as 1011 Ω. A temperature gradient ΔT is produced across the sample by means of differential optical heating of the ends of the sample. The Seebeck voltage ΔV is measured using a specially designed amplifier circuit with an input impedance of 1013 Ω. The Seebeck coefficient is obtained from the slope of the plot of ΔV vs ΔT.
The effect of paramagnetic impurities in anisotropic superconductors is investigated with use of the Shiba-Rusinov theory for the impurities and the Eliashberg formalism for the host superconductor. The analytical exp...
The effect of paramagnetic impurities in anisotropic superconductors is investigated with use of the Shiba-Rusinov theory for the impurities and the Eliashberg formalism for the host superconductor. The analytical expressions for the transition temperature Tc and the specific-heat jump ΔC are derived with the use of the square-well model for the electron-phonon interaction. Considered as a function of the spin-flip scattering rate α, the quantities TcTc0 and ΔCΔC0 depend on the microscopic parameters λ, ωD, and μ* of the host material. The dependence on the material parameters becomes insignificant if the above properties are plotted versus ααcr or if ΔCΔC0 versus TcTc0 is studied. (Tc0 and ΔC0 are values of Tc and ΔC, respectively, in the absence of impurities, αcr is the value of α for which Tc becomes zero, λ is electron-phonon—interaction parameter, ωD is the Debye frequency, and μ* is the Coulomb pseudopotential.)
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