On metallic clusters squeezed in atomic cagesThe stability of metallic clusters of sodium (Na) in the octahedral cages of Na-doped fullerites Na6C60 and Na11C60 is discussed within a Thomas-Fermi model. It is shown that the tetrahedral…M. Apostol·Mar 24, 1996SaveLearn
Mechanism of Poisoning the Catalytic Activity of Pd(100) by a Sulfur AdlayerThe modification of the potential-energy surface (PES) of H2 dissociation over Pd(100) as induced by the presence of a (2x2) S adlayer is investigated by density-functional theory and the linear…Steffen Wilke, Matthias Scheffler·Mar 18, 1996SaveLearn
First-principles study of stability and vibrational properties of tetragonal PbTiO3A first-principles study of the vibrational modes of PbTiO3 in the ferroelectric tetragonal phase has been performed at all the main symmetry points of the Brillouin zone (BZ). The calculations use…Alberto Garcia, David Vanderbilt·Mar 14, 1996SaveLearn
A Model for the Elasticity of Compressed EmulsionsWe present a new model to describe the unusual elastic properties of compressed emulsions. The response of a single droplet under compression is investigated numerically for different Wigner-Seitz…Martin-Daniel Lacasse, Gary S. Grest, Dov Levine et al.·Mar 12, 1996SaveLearn
Deformation of Small Compressed DropletsWe investigate the elastic properties of small droplets under compression. The compression of a bubble by two parallel plates is solved exactly and it is shown that a lowest-order expansion of the…Martin-Daniel Lacasse, Gary S. Grest, Dov Levine·Mar 12, 1996SaveLearn
Vibrational Spectra of Defects in Silicon: An Orbital Radii ApproachA phenomenological approach to the stretching mode vibrational frequencies of defects in semiconductors is proposed. A novel quantum scale is defined in terms of the first principles pseudopotential…H. C. Verma, George C. John, Vijay A. Singh·Mar 8, 1996SaveLearn
Six-Dimensional Quantum Dynamics of Adsorption and Desorption of H2 at Pd(100): No Need for a Molecular Precursor Adsorption StateWe report six-dimensional quantum dynamical calculations of dissociative adsorption and associative desorption of the system H2/Pd(100) using an ab-initio potential energy surface. We focus on…Axel Gross, Steffen Wilke, Matthias Scheffler·Mar 5, 1996SaveLearn
Dynamical Quantum Processes of Molecular Beams at Surfaces: Dissociative Adsorption of Hydrogen on Metal SurfacesDue to the improvement of computer power and the development of efficient algorithms it is now possible to combine high-dimensional quantum dynamical calculations of the dissociative adsorption of…Axel Gross·Mar 5, 1996SaveLearn
Density functional theory study of Na at Al(111) and O at Ru(0001)The success of density functional theory for the description of the adsorption of atoms on surfaces is well established, and based on recent calculations using gradient corrections, it has been shown…Catherine Stampfl·Mar 4, 1996SaveLearn
Applications of a tight-binding total energy method for transition and noble metals: Elastic Constants, Vacancies, and Surfaces of Monatomic MetalsA recent tight-binding scheme provides a method for extending the results of first principles calculations to regimes involving 102 - 103 atoms in a unit cell. The method uses an analytic set of…Michael J. Mehl, Dimitrios A. Papaconstantopoulos·Feb 22, 1996SaveLearn
Statistical Properties of the Dense Hydrogen Plasma: an ab initio Molecular Dynamics InvestigationThe metallic regime of the hydrogen plasma is studied by ab initio Molecular Dynamics simulations, for classical protons and fully degenerate electrons, in the strong coupling regime of the protons.…Jorge Kohanoff, Jean-Pierre Hansen·Feb 22, 1996SaveLearn
Third order dielectric susceptibility in a model quantum paraelectricIn the context of perovskite quantum paraelectrics, we study the effects of a quadrupolar interaction Jq, in addition to the standard dipolar one Jd. We concentrate here on the nonlinear…R. Martonak, E. Tosatti·Feb 15, 1996SaveLearn
The Structure, Dynamics and Electronic Structure of Liquid Ag-Se Alloys Investigated by Ab Initio SimulationAb initio molecular-dynamics simulations have been used to investigate the structure, dynamics and electronic properties of the liquid alloy Ag(1-x)Se(x) at 1350 K and at the three compositions…F. Kirchhoff, J. M. Holender, M. J. Gillan·Feb 7, 1996SaveLearn
Development of a Kohn-Sham like potential in the Self-Consistent Atomic Deformation ModelThis is a brief description of how to derive the local ``atomic'' potentials from the Self-Consistent Atomic Deformation (SCAD) model density function. Particular attention is paid to the…M. J. Mehl, L. L. Boyer, H. T. Stokes·Jan 29, 1996SaveLearn
Semiconductor effective charges from tight-binding theoryWe calculate the transverse effective charges of zincblende compound semiconductors using Harrison's tight-binding model to describe the electronic structure. Our results, which are essentially…J. Bennetto, David Vanderbilt·Jan 15, 1996SaveLearn
Coulomb interaction and ferroelectric instability of BaTiO3Using first-principles calculations, the phonon frequencies at the Γ point and the dielectric tensor are determined and analysed for the cubic and rhombohedral phases of BaTiO3. The…Ph. Ghosez, X. Gonze, J. -P. Michenaud·Jan 8, 1996SaveLearn
Linear-Response Calculation of Electron-Phonon Coupling ParametersAn ab initio method for calculating electron-phonon coupling parameters is presented. The method is an extension of the plane-wave-based linear-response method for the calculation of lattice…Amy Y. Liu, Andrew A. Quong·Dec 22, 1995SaveLearn
Separable Dual Space Gaussian Pseudo-potentialsWe present pseudo-potential coefficients for the first two rows of the periodic table. The pseudo potential is of a novel analytic form, that gives optimal efficiency in numerical calculations using…S. Goedecker, M. Teter, J. Hutter·Dec 21, 1995SaveLearn
Wetting of the Au(110) substrate: Homoepitaxial islands and layersThe morphology of epitaxial structures formed in solidification of liquid Au films on the Au(110) surface was studied by molecular dynamics simulation based on a many--body interatomic potential. The…G. Bilalbegovic·Dec 19, 1995SaveLearn
First-Principles Calculation of the Structure of MercuryMercury has perhaps the strangest behavior of any of the metals. Although the other metals in column IIB have an hcp ground state, mercury's ground state is the body centered tetragonal βHg…Michael J. Mehl·Dec 19, 1995SaveLearn
Formation Energy, Stress, and Relaxations of Low-Index Rhodium SurfacesAb initio local-density-functional-theory calculations of formation energies, surface stress, and multilayer relaxations are reported for the (111), (100), and (110) surfaces of Rh. The study is…Alessio Filippetti, Vincenzo Fiorentini, Kurt Stokbro et al.·Dec 12, 1995SaveLearn
Role of Self-Interaction Effects in the Geometry Optimization of Small Metal ClustersBy combining the Self-Interaction Correction (SIC) with pseudopotential perturbation theory, the role of self-interaction errors inherent to the Local Density Approximation (LDA) to Density…Jorge M. Pacheco, Walter Ekardt, Wolf-Dieter Schoene·Nov 23, 1995SaveLearn
The Effective Particle-Hole Interaction and the Optical Response of Simple Metal ClustersFollowing Sham and Rice [L. J. Sham, T. M. Rice, Phys. Rev. 144 (1966) 708] the correlated motion of particle-hole pairs is studied, starting from the general two-particle Greens function. In this…Walter Ekardt, Jorge M. Pacheco·Nov 23, 1995SaveLearn
Scattering of rare-gas atoms at a metal surface: evidence of anticorrugation of the helium-atom potential-energy surface and the surface electron densityRecent measurements of the scattering of He and Ne atoms at Rh(110) suggest that these two rare-gas atoms measure a qualitatively different surface corrugation: While Ne atom scattering seemingly…Max Petersen, Steffen Wilke, Paolo Ruggerone et al.·Nov 22, 1995SaveLearn
Adlayer core-level shifts of admetal monolayers on transition metal substrates and their relation to the surface chemical reactivityUsing density-functional-theory we study the electronic and structural properties of a monolayer of Cu on the fcc (100) and (111) surfaces of the late 4d transition metals, as well as a monolayer of…Dieter Hennig, Maria Veronica Ganduglia-Pirovano, Matthias Scheffler·Nov 22, 1995SaveLearn