A model of linear chain submonolayer structures. Application to Li/W(112) and Li/Mo(112)We propose a lattice gas model to account for linear chain structures adsorbed on (112) faces of W and Mo. The model includes a dipole-dipole interaction as well as a long-ranged indirect…F. Bagehorn, J. Lorenc, Cz. Oleksy·Nov 10, 1995SaveLearn
Potential Energy Surface for H2 Dissociation over Pd(100)The potential energy surface (PES) of dissociative adsorption of H2 on Pd(100) is investigated using density functional theory and the full-potential linear augmented plane wave (FP-LAPW) method.…Steffen Wilke, Matthias Scheffler·Nov 1, 1995SaveLearn
Parallelisation of algorithms for ab initio computation of material propertiesParallel algorithms for ab initio calculations of vibrations modes of solids are presented and implemented under PVM. Load balancing and communication problems are dealt with in order to increase…G. -M. Rignanese, J. -M. Beuken, J. -P. Michenaud et al.·Nov 1, 1995SaveLearn
Force calculation and atomic-structure optimization for the full-potential linearized augmented plane-wave code WIENFollowing the approach of Yu, Singh, and Krakauer [Phys. Rev. B 43 (1991) 6411] we extended the linearized augmented plane wave code WIEN of Blaha, Schwarz, and coworkers by the evaluation of forces.…Bernd Kohler, Steffen Wilke, Matthias Scheffler et al.·Nov 1, 1995SaveLearn
Unusually Large Thermal Expansion of Ag(111)We investigate the thermal behavior of the (111) surface of silver, using phonon frequencies obtained from ab initio total energy calculations, and anharmonic effects treated within a quasiharmonic…Shobhana Narasimhan, Matthias Scheffler·Nov 1, 1995SaveLearn
Theoretical study of O adlayers on Ru(0001)Recent experiments performed at high pressures indicate that ruthenium can support unusually high concentrations of oxygen at the surface. To investigate the structure and stability of high coverage…Catherine Stampfl, Matthias Scheffler·Oct 31, 1995SaveLearn
Ab initio pseudopotential study of Fe, Co, and Ni employing the spin-polarized LAPW approachThe ground-state properties of Fe, Co, and Ni are studied with the linear-augmented-plane-wave (LAPW) method and norm-conserving pseudopotentials. The calculated lattice constant, bulk modulus, and…Jun-Hyung Cho, Matthias Scheffler·Oct 31, 1995SaveLearn
Enhanced electron-phonon coupling at the Mo and W(110) surfaces induced by adsorbed hydrogenThe possible occurrence of either a charge-density-wave or a Kohn anomaly is governed by the presence of Fermi-surface nesting and the subtle interaction of electrons and phonons. Recent experimental…Bernd Kohler, Paolo Ruggerone, Matthias Scheffler et al.·Oct 30, 1995SaveLearn
Molecular Dynamics Simulation of Electron Trapping in the Sapphire LatticeEnergy storage and release in dielectric materials can be described on the basis of the charge trapping mechanism. Most phenomenological aspects have been recently rationalized in terms of the space…C. Rambaut, K. H. Oh, H. Jaffrezic et al.·Oct 16, 1995SaveLearn
Pressure Dependence of Born Effective Charges, Dielectric Constant and Lattice Dynamics in SiCThe pressure dependence of the Born effective charge, dielectric constant and zone-center LO and TO phonons have been determined for 3C-SiC by a linear response method based on the linearized…Cheng-Zhang Wang, Rici Yu, Henry Krakauer·Oct 13, 1995SaveLearn
Composition Dependence of the Structure and Electronic Properties of Liquid Ga-Se Alloys Studied by Ab Initio Molecular Dynamics SimulationAb initio molecular dynamics simulation is used to study the structure and electronic properties of the liquid Ga-Se system at the three compositions Ga2Se, GaSe and Ga2Se3, and of the GaSe…J. M. Holender, M. J. Gillan·Oct 2, 1995SaveLearn
First-principles investigation of 180-degree domain walls in BaTiO3We present a first-principles study of 180-degree ferroelectric domain walls in tetragonal barium titanate. The theory is based on an effective Hamiltonian that has previously been determined from…J. Padilla, W. Zhong, David Vanderbilt·Sep 21, 1995SaveLearn
Effect of quantum fluctuations on structural phase transitions in SrTiO3 and BaTiO3Using path-integral Monte Carol simulations and an ab initio effective Hamiltonian, we study the effects of quantum fluctuations on structural phase transitions in the cubic perovskite compounds…W. Zhong, David Vanderbilt·Sep 21, 1995SaveLearn
The de Haas-van Alphen effect in canonical and grand canonical multiband Fermi liquidA qualitatively different character of dHvA oscillations has been found in a multiband (quasi)two dimensional Fermi liquid with a fixed fermion density ne (canonical ensemble) compared with an…A. S. Alexandrov, A. M. Bratkovsky·Sep 21, 1995SaveLearn
Stability of Liquid Crystalline MacroemulsionsThe thermodynamic stability of emulsions of liquid crystal in water (glycerol) matrices is demonstrated for a wide range of materials and concentrations. Coalescence is prevented by an energy barrier…E. M. Terentjev·Sep 18, 1995SaveLearn
Ab initio study of the volume dependence of dynamical and thermodynamical properties of siliconMotivated by the negative thermal expansion observed for silicon between 20 K and 120 K, we present first an ab initio study of the volume dependence of interatomic force constants, phonon…G. -M. Rignanese, J. -P. Michenaud, X. Gonze·Sep 6, 1995SaveLearn
Electronic Structure and Valence Band Spectra of Bi4Ti3O12The x-ray photoelectron valence band spectrum and x-ray emission valence-band spectra (Ti K beta5, Ti Lalpha, O Kalpha) of Bi4Ti3O12 are presented (analyzed in the common energy scale) and…A. V. Postnikov, St. Bartkowski, F. Mersch et al.·Sep 6, 1995SaveLearn
Theoretical Study of One-dimensional Chains of Metal Atoms in NanotubesUsing first-principles total-energy pseudopotential calculations, we have studied the properties of chains of potassium and aluminum in nanotubes. For BN tubes, there is little interaction between…Angel Rubio, Yoshiyuki Miyamoto, X. Blase et al.·Aug 25, 1995SaveLearn
The Influence of Gradient Corrections on Bulk and Surface Properties of TiO2 and SnO2First-principles calculations based on density functional theory and the pseudo\-potential method have been used to investigate the influence of gradient corrections to the standard LDA technique on…J. Goniakowski, J. M. Holender, L. N. Kantorovich et al.·Aug 24, 1995SaveLearn
The Adsorption of H2O on TiO2 and SnO2(110) Studied by First-Principles CalculationsFirst-principles calculations based on density functional theory and the pseudopotential method have been used to investigate the energetics of H2O adsorption on the (110) surface of TiO2 and…J. Goniakowski, M. J. Gillan·Aug 24, 1995SaveLearn
Towards a Linear-Scaling DFT Technique: The Density Matrix ApproachA recently proposed linear-scaling scheme for density-functional pseudopotential calculations is described in detail. The method is based on a formulation of density functional theory in which the…E. Hernandez, C. M. Goringe, M. J. Gillan·Aug 15, 1995SaveLearn
The Effect of Strain on Thermodynamics of the Weakly First-Order Phase TransitionElastic matrix distortion around a growing inclusion of a new phase is analyzed and the associated contribution to the Gibbs free energy is considered. The constant-composition transformation from…M. A. Fradkin·Aug 8, 1995SaveLearn
Density-Functional Theory of the nonlinear optical susceptibility: application to cubic semiconductorsWe present a general scheme for the computation of the time dependent (TD) quadratic susceptibility (χ(2)) of an extended insulator obtained by applying the `2n+1' theorem to the action…Andrea Dal Corso, Francesco Mauri, Angel Rubio·Aug 7, 1995SaveLearn
Comparison of the Electronic Structures and Energetics of Ferroelectric LiNbO3 and LiTaO3This paper explains the origin of the ferroelectric instability in LiNbO3 and LiTaO3 and compares the electronic structures and energetics of the two materials.Iris Inbar, R. E. Cohen·Aug 3, 1995SaveLearn
Band structure analysis of the conduction-band mass anisotropy in 6H and 4H SiCThe band structures of 6H and 4H SiC calculated by means of the FP-LMTO method are used to determine the effective mass tensors for their conduction-band minima. The results are shown to be…Walter R. L. Lambrecht, Benjamin Segall·Aug 2, 1995SaveLearn