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Now showing items 101-120 of 1582
Gravitational bending of light by planetary multipoles and its measurement with microarcsecond astronomical interferometers
(arXiv, 2007)
microarcsecond are taken into account, parametrized, and classified in accordance with their physical origin. We discuss the observational capabilities of the near-future optical and radio interferometers for detecting the Doppler modulation of the radial...
Pioneer anomaly and the helicity-rotation coupling
(arXiv, 2003)
The modification of the Doppler effect due to the coupling of the helicity of the radiation with the rotation of the source/receiver is considered in the case of the Pioneer 10/11 spacecraft. We explain why the Pioneer ...
Theory of photon bands in three-dimensional periodic dielectric structures
(American Physical Society, 1990)
Recent experiments have found the existence of ''photon bands'' in periodic dielectric structures analogous to the electron bands in the solid. Using a plane-waves method, we study in the scalar-wave approximation the ...
Energetic stabilization of the Mizoguchi structure for magnetite by band-structure effects
(American Physical Society, 1993)
We show that the Mizoguchi structure is energetically stabilized over the Verwey structure for magnetite by electron hopping on the B sublattice. We use the one-band Cullen-Callen model Hamiltonian for the electronic band ...
Electromagnetic wave propagation in periodic structures: Bloch wave solution of Maxwell's equations
(American Physical Society, 1990)
We examine the propagation of electromagnetic waves in periodic dielectric structures by solving the vector Maxwell equations with the plane-wave method. Contrary to experimental reports, as well as results of scalar-wave ...
Electron states, magnetism, and the Verwey transition in magnetite
(American Physical Society, 1991)
Using density-functional calculations, we examine the electronic structure of magnetite in the spinel crystal structure in order to gain insight into the nature of the Verwey transition. The calculated cohesive and magnetic ...
Orientational ordering of commensurate Fe(CO)5 monolayers on graphite
(American Physical Society, 1983)
Elastic neutron diffraction and Mössbauer spectroscopy have been used to study the structure, orientational-disordering (OD) transition, and melting of an Fe(CO)5 submonolayer adsorbed on Grafoil. The OD transition occurs ...
Intramolecular and Surface Vibratory Modes of Butane Adsorbed on Graphite Observed by Inelastic Neutron Scattering
(American Physical Society, 1977)
Inelastic and elastic neutron scattering have been used to study the dynamics and structure of butane (C4H10) adsorbed on a graphitized carbon powder at 77 K. In addition to the intramolecular vibrations found in the bulk ...
Melting mechanism in monolayers of flexible rod-shaped molecules
(American Physical Society, 1992)
The melting of butane and hexane monolayers adsorbed on a graphite basal-plane surface has been studied by molecular-dynamics simulations and experimentally by neutron diffraction. The simulation results are qualitatively ...
Electronic structure of the CaF2/Si(111) interface
(American Physical Society, 1991)
The electronic structure of the CaF2/Si(111) interface calculated within the local-density-functional theory with the linear muffin-tin orbitals method is presented. We examine the interface states for three different ...
Comparison of electron bands of hexagonal and cubic diamond
(American Physical Society, 1990)
Using the local-density-theory and the linear-muffin-tin-orbitals method, we calculate the electron band structures of hexagonal (lonsdaleite) and cubic diamond. Even though the arrangement of atoms is very similar between ...
Electronic Hamiltonian and antiferromagnetic interactions in La2CuO4
(American Physical Society, 1989)
A many-body Hamiltonian for La2CuO4 with ab initio parameters is solved numerically using embedded-cluster approximations. The results give an antiferromagnetic insulator with a 2-3 eV energy gap, consistent with spectroscopic ...
Currents in the compressible and incompressible regions of the two-dimensional electron gas
(American Physical Society, 1994)
We derive a general expression for the low- temperature equilibrium orbital current distribution in a two-dimensional electron gas, subjected to a perpendicular magnetic field and in a confining potential that varies slowly ...
Current-density-functional theory of quantum dots in a magnetic field
(American Physical Society, 1994)
We present a study of ground-state energies and densities of quantum dots in a magnetic field, which takes into account correlation effects through the current-density-functional theory. The method is first tested against ...
Dynamic dielectric response function of liquid water
(American Physical Society, 1994)
Our previous theory for the dielectric response of waterlike fluids [Phys. Rev. A 46, 7548 (1992); Phys. Rev. E 48, 3172 (1993)] is generalized to take into account the asymmetrical inertia tensor of the water molecules ...
Detection of the gravitomagnetic field using an orbiting superconducting gravity gradiometer. Theoretical principles
(American Physical Society, 1989)
The angular momentum of the Earth produces gravitomagnetic components of the Riemann curvature tensor, which are of the order of 10-10 of the Newtonian tidal terms arising from the mass of the Earth. These components could ...
Electronic transitions in CdTe under pressure
(American Physical Society, 1990)
We present a photoluminescence study of CdTe:Sb at 5 and 15 K under hydrostatic pressures of 0 to 32 kbar. We determine the pressure coefficients of several electronic transitions: the neutral-acceptor-bound exciton A0X, ...
High-pressure studies of GaAs-Ga1-xAlxAs quantum wells of widths 26 to 150 Å
(American Physical Society, 1986)
Photoluminescence spectra of GaAs quantum wells of widths 26 to 150 Å are studied as a function of hydrostatic pressure (0-70 kbar) at 80 and 150 K. The pressure coefficients of both the heavy- and light-hole excitons are ...
Energetic stabilization of the Mizoguchi structure for magnetite by
(American Physical Society, 1993)
In view of some issues raised recently about the electronic structure and the nature of electronic conduction in simple cubic CsSnBr3, we have carried out a self-consistent density-functional calculation of the electronic ...
Collective Excitations in Ethane Monolayers Adsorbed on Graphite (0001) Surfaces
(American Physical Society, 1984)
Inelastic incoherent neutron spectra below 4.1 THz have been obtained for the √3×4 "herringbone" and √3×√3 "on-end" monolayer phases of ethane adsorbed on graphite basal planes. One-phonon cross sections calculated ...