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WORLD SCIENTIFIC eBooks

Correlations in clusters and related systems : new perspectives on the many- body problem : International Centre for Theoretical Physics, Trieste, Italy, 26-29 July 1994

J P Connerade

Published Jan 1, 1996• 4 citations
OpenAlex

Abstract

On clusters, metallic clusters and giant resonances - an introduction, J.-P. Connerade resonances in small fermi systems, M. Barma and R.S. Bhalerao many-body theory of electron correlations - the RPAE and beyond, M. Ya Amusia recent observations of giant resonances in atoms and ions, M.W.D. Mansfield et al collective properties in negative ion photodetachment, V.K. Ivanov probing mixed valence in atomic clusters and solids, R.C. Karnatak and J.-P. Connerade the Anderson impurity model for solids, A. Kotani many-body calculations for metallic clusters using the Jellium model, V.K. Ivanov and A.N. Ipatov the RPA model - giant resonances in nuclei and fullerenes, G. Colo et al electronic properties of metal clusters - many-body correlations, C. Guet and S.A. Blundell ultra-short pulse lasers and time-resolved studies, J. Marangos stabilization and above threshold ionization in intense adiabatic and ultra-short laser pulses, F.H.M. Faisal et al molecules interacting with intense laser pulses, K. Dietz et al.

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Proceedings of the International Conference on Many-Body Physics : Coimbra, Portugal, 20-25 September 1993

Carlos Fiolhais, M. Fiolhais, C. A. de Sousa +1 more

Non-Local Density Functionals for Exchange and Correlation: Application to Electronic Systems, J Alonso From Interacting Nucleons to Hamiltonian Lattice Gauge Field Theories: A Unified Many-Body Treatment, R Bishop Quantum Beats in Mean-Field Systems and Their Semiclassical Interpretation, M Brack The Super-Atom-Model as Link between Atoms and Solids: The Jellium Model, W Ekardt The Quark Model, Nucleon-Nucleon Interaction and the Properties of Nuclei, A Faessler Quark Structure of Baryons, K Goeke Chiral Perturbation Theory at the Quark Level, A Ivanov The Nambu-Jona-Lasinio Model and Nuclear Structure, S Moszkowski Density Gradient Expansion of the Exchange-Correlation Energy and Its Generalization, J Perdew The Many-Body Problems Thermo-Field Dynamics, J da Providencia Projected Statistics and Level Densities in Hot Nuclei, P Ring A Consistent Regularization of the Real and Imaginary Parts of the Action in Chiral Theory, G Ripka and other papers.

•Jan 1, 1994•0 citations

Electronic Correlation Mapping

Jamal Berakdar

An up-to-date selection of applications of correlation spectroscopy, in particular as far as the mapping of properties of correlated many-body systems is concerned. The book starts with a qualitative analysis of the outcome of the two-particle correlation spectroscopy of localized and delocalized electronic systems as they occur in atoms and solids. The second chapter addresses how spin-dependent interactions can be imaged by means of correlation spectroscopy, both in spin-polarized and extended systems. A further chapter discusses possible pathways for the production of interacting two-particle continuum states. After presenting some established ways of quantifying electronic correlations and pointing out the relationship to correlation spectroscopy, the author addresses in a separate chapter the electron-electron interaction in extended systems, and illustrates the ideas by some applications to fullerenes and metal clusters. The last two chapters are devoted to the investigation of the potential of two-particle spectroscopy in studying ordered surfaces and disordered samples. Throughout the book the material is analyzed using rather qualitative arguments, and the results of more sophisticated theories serve the purpose of endorsing the suggested physical scenarios. The foundations of some of these theories have been presented in a corresponding volume entitled "Concepts of Highly Excited Electronic Systems" (3-527-40335-3).

Wiley eBooks•Jan 1, 2006•3 citations

Strongly correlated electron systems in chemistry : experiment and theoy

S. Ramasesha, D. D. Sarma

Electronic Correlation in Molecules - Some Fundamental Problems Improving the Panoply of Quantum Chemical Methods for the Study of Correlated Extended Systems Lie-Algebraic Structure and the Coupled Cluster Method Configuration Interaction Studies Using Biorthogonal Approach to VB Basis Optimised Virtual Orbitals for the Calculation of Molecular Properties of Excited Electronic States A Novel MO-VB Scheme for Excitation Gaps in Correlated Mode Hamiltonians Correlated Approach to Molecular Properties Infinite Volume Extrapolations of Finite Clusters Calculations - How Correct are These? Calculation of the Hyperpolarisabilities of Organic Molecules and their Role in the Interpretation of Nonlinear Optical Phenomena in Organic Crystals Energy Thresholds in Polysilanes - Elementary Excitations of Alternating Conjugated Chains Inter- and Intramolecular Spin Coupling in Organics Electron Correlation Effects in Semiconductorquantum Dot Nanostructures Numerical Simulations of Strongly-Correlated Systems-Interlayer Tunnelling Mechanism, Spin-Charge Separation and Odd-Gap Pairing Metal Insulator Transition in 3rd Transition Metal Oxides Superconductivity in Doped Fullerenes.

•Jan 1, 1996•0 citations

The theory of collective motion probed by light

M. Ya. Amusia, J-P Connerade

A review of collective phenomena in atomic and quasi-atomic systems is presented. The fundamental unity of the subject is stressed by appealing to a simple conceptual scheme, namely the Landau theory of wave propagation applied to a Fermi fluid. Collective giant resonances in nuclei, atoms, metallic clusters and fullerenes are all discussed and related to each other. Single-photon dipole, two-photon and quadrupole excitation are considered, as well as the observation of harmonics, and the enhancement of double excitations by a giant resonance. Other near-threshold phenomena are discussed, and experiments involving strong-field lasers are also considered in this context.

Reports on Progress in Physics•Jan 1, 2000•76 citations

Many-body aspects of electron correlation in clusters and solids

Gerardo Ortíz

These Ecole polytechnique federale de Lausanne EPFL, n° 1053 (1992)Chaire de physique numerique de la matiere condensee Reference doi:10.5075/epfl-thesis-1053Print copy in library catalog Record created on 2005-03-16, modified on 2016-08-08

•Jan 1, 1992•0 citations

Collective excitations in Random Phase Approximation and beyond

F. Catara, D. Gambacurta, M. Grasso +1 more

Collective excitations are one of the most common and interesting features of many-body systems. Of particular interest are those collective modes which can be interpreted in terms of vibrations. Nuclei show a large variety of such modes, both low-lying and high-lying. In particular the giant dipole resonance is due to the coherent motion of protons against neutrons. Its analogue in metal clusters is the dipole plasmon excitation, due to the oscillation of electrons against the positive ions. The Random Phase Approximation (RPA) is extensively used as a microscopic theory to study the basic properties of these collective excitations. In the derivation of RPA use is made of the Quasi Boson Approximation (QBA). It consists in replacing the expectation values in the correlated ground state with those in the uncorrelated (Hartree-Fock) one. Strictly related to QBA is the feature of RPA of predicting a harmonic spectrum. On the other hand, the existence of anharmonicities in the multiphonon spectra of nuclei and their relevance in various physical processes are well established. Overcoming QBA has represented the starting point of many attempts aiming at improving RPA. A recently developed approach in this line will be presented and discussed. A very nice property of RPA is to satisfy Energy Weighted Sum Rules (EWSR). However, some violations are present in several extensions of RPA. We will show how to cure this shortcoming.

Journal of Physics Conference Series•Jan 1, 2011•0 citations
On clusters, metallic clusters and giant resonances - an introduction, J.-P. Connerade resonances in small fermi systems, M. Barma and R.S. Bhalerao many-body theory of electron correlations - the RPAE and beyond, M. Ya Amusia recent observations of giant resonances in atoms and ions, M.W.D. Mansfield et al collective properties in negative ion photodetachment, V.K. Ivanov probing mixed valence in atomic clusters and solids, R.C. Karnatak and J.-P. Connerade the Anderson impurity model for solids, A. Kotani many-body calculations for metallic clusters using the Jellium model, V.K. Ivanov and A.N. Ipatov the RPA model - giant resonances in nuclei and fullerenes, G. Colo et al electronic properties of metal clusters - many-body correlations, C. Guet and S.A. Blundell ultra-short pulse lasers and time-resolved studies, J. Marangos stabilization and above threshold ionization in intense adiabatic and ultra-short laser pulses, F.H.M. Faisal et al molecules interacting with intense laser pulses, K. Dietz et al.
Non-Local Density Functionals for Exchange and Correlation: Application to Electronic Systems, J Alonso From Interacting Nucleons to Hamiltonian Lattice Gauge Field Theories: A Unified Many-Body Treatment, R Bishop Quantum Beats in Mean-Field Systems and Their Semiclassical Interpretation, M Brack The Super-Atom-Model as Link between Atoms and Solids: The Jellium Model, W Ekardt The Quark Model, Nucleon-Nucleon Interaction and the Properties of Nuclei, A Faessler Quark Structure of Baryons, K Goeke Chiral Perturbation Theory at the Quark Level, A Ivanov The Nambu-Jona-Lasinio Model and Nuclear Structure, S Moszkowski Density Gradient Expansion of the Exchange-Correlation Energy and Its Generalization, J Perdew The Many-Body Problems Thermo-Field Dynamics, J da Providencia Projected Statistics and Level Densities in Hot Nuclei, P Ring A Consistent Regularization of the Real and Imaginary Parts of the Action in Chiral Theory, G Ripka and other papers.
An up-to-date selection of applications of correlation spectroscopy, in particular as far as the mapping of properties of correlated many-body systems is concerned. The book starts with a qualitative analysis of the outcome of the two-particle correlation spectroscopy of localized and delocalized electronic systems as they occur in atoms and solids. The second chapter addresses how spin-dependent interactions can be imaged by means of correlation spectroscopy, both in spin-polarized and extended systems. A further chapter discusses possible pathways for the production of interacting two-particle continuum states. After presenting some established ways of quantifying electronic correlations and pointing out the relationship to correlation spectroscopy, the author addresses in a separate chapter the electron-electron interaction in extended systems, and illustrates the ideas by some applications to fullerenes and metal clusters. The last two chapters are devoted to the investigation of the potential of two-particle spectroscopy in studying ordered surfaces and disordered samples. Throughout the book the material is analyzed using rather qualitative arguments, and the results of more sophisticated theories serve the purpose of endorsing the suggested physical scenarios. The foundations of some of these theories have been presented in a corresponding volume entitled "Concepts of Highly Excited Electronic Systems" (3-527-40335-3).
Electronic Correlation in Molecules - Some Fundamental Problems Improving the Panoply of Quantum Chemical Methods for the Study of Correlated Extended Systems Lie-Algebraic Structure and the Coupled Cluster Method Configuration Interaction Studies Using Biorthogonal Approach to VB Basis Optimised Virtual Orbitals for the Calculation of Molecular Properties of Excited Electronic States A Novel MO-VB Scheme for Excitation Gaps in Correlated Mode Hamiltonians Correlated Approach to Molecular Properties Infinite Volume Extrapolations of Finite Clusters Calculations - How Correct are These? Calculation of the Hyperpolarisabilities of Organic Molecules and their Role in the Interpretation of Nonlinear Optical Phenomena in Organic Crystals Energy Thresholds in Polysilanes - Elementary Excitations of Alternating Conjugated Chains Inter- and Intramolecular Spin Coupling in Organics Electron Correlation Effects in Semiconductorquantum Dot Nanostructures Numerical Simulations of Strongly-Correlated Systems-Interlayer Tunnelling Mechanism, Spin-Charge Separation and Odd-Gap Pairing Metal Insulator Transition in 3rd Transition Metal Oxides Superconductivity in Doped Fullerenes.
A review of collective phenomena in atomic and quasi-atomic systems is presented. The fundamental unity of the subject is stressed by appealing to a simple conceptual scheme, namely the Landau theory of wave propagation applied to a Fermi fluid. Collective giant resonances in nuclei, atoms, metallic clusters and fullerenes are all discussed and related to each other. Single-photon dipole, two-photon and quadrupole excitation are considered, as well as the observation of harmonics, and the enhancement of double excitations by a giant resonance. Other near-threshold phenomena are discussed, and experiments involving strong-field lasers are also considered in this context.
Collective excitations are one of the most common and interesting features of many-body systems. Of particular interest are those collective modes which can be interpreted in terms of vibrations. Nuclei show a large variety of such modes, both low-lying and high-lying. In particular the giant dipole resonance is due to the coherent motion of protons against neutrons. Its analogue in metal clusters is the dipole plasmon excitation, due to the oscillation of electrons against the positive ions. The Random Phase Approximation (RPA) is extensively used as a microscopic theory to study the basic properties of these collective excitations. In the derivation of RPA use is made of the Quasi Boson Approximation (QBA). It consists in replacing the expectation values in the correlated ground state with those in the uncorrelated (Hartree-Fock) one. Strictly related to QBA is the feature of RPA of predicting a harmonic spectrum. On the other hand, the existence of anharmonicities in the multiphonon spectra of nuclei and their relevance in various physical processes are well established. Overcoming QBA has represented the starting point of many attempts aiming at improving RPA. A recently developed approach in this line will be presented and discussed. A very nice property of RPA is to satisfy Energy Weighted Sum Rules (EWSR). However, some violations are present in several extensions of RPA. We will show how to cure this shortcoming.