Electron Correlations in Molecules and Solids

Häftad, Engelska, 1995

4 049 kr

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Electron Correlations in Molecules and Solids bridges the gap between quantum chemistry and solid-state theory. In the first half of the text new concepts are developed for treating many-body and correlation effects, combining standard quantum chemical methods with projection techniques, Greens-function methods and Monte-Carlo techniques. The second half deals with applications of the theory to molecules, semiconductors, transition metals, heavy-fermion systems, and the new high-Tc superconducting materials.

Produktinformation

Utgivningsdatum1995-10-09
Mått155 x 235 x 27 mm
Vikt750 g
FormatHäftad
SpråkEngelska
SerieSpringer Series in Solid-State Sciences
Antal sidor483
Upplaga3
FörlagSpringer-Verlag Berlin and Heidelberg GmbH & Co. KG
ISBN9783540593645

Tillhör följande kategorier

1. Introduction.- 2. The Independent-Electron Approximation.- 2.1 Starting Hamiltonian.- 2.2 Basis Functions and Basis Sets.- 2.3 Self-Consistent Field Approximation.- 2.4 Simplified SCF Calculational Schemes.- 2.5 Koopmans’ Theorem.- 2.6 Homogeneous Electron Gas.- 2.7 Local Exchange Potential — The Xa Method.- 2.8 Shortcomings of the Independent-Electron Approximation.- 2.9 Unrestricted SCF Approximation.- 3. Density Functional Theory.- 3.1 Thomas-Fermi Method.- 3.2 Hohenberg-Kohn-Sham Theory.- 3.3 Local-Density Approximation.- 3.4 Results for Atoms, Molecules, and Solids.- 3.5 Extensions and Limitations.- 4. Quantum-Chemical Approach to Electron Correlations.- 4.1 Configuration Interactions.- 4.2 Many-Body Perturbation Theory.- 5. Cumulants, Partitioning, and Projections.- 5.1 Cumulant Representation.- 5.2 Projection and Partitioning Techniques.- 5.3 Coupled-Cluster Method.- 5.4 Comparison with Various Trial Wavefunctions.- 5.5 Simplified Correlation Calculations.- 6. Excited States.- 6.1 CI Calculations and Basis Set Requirements.- 6.2 Excitation Energies in Terms of Cumulants.- 6.3 Green’s Function Method.- 6.4 Local Operators.- 7. Finite-Temperature Techniques.- 7.1 Approximations for Thermodynamic Quantities.- 7.2 Functional-Integral Method.- 7.3 Monte Carlo Methods.- 8. Correlations in Atoms and Molecules.- 8.1 Atoms.- 8.2 Hydrocarbon Molecules.- 8.3 Molecules Consisting of First-Row Atoms.- 8.4 Strength of Correlations in Different Bonds.- 8.5 Polymers.- 8.6 Photoionization Spectra.- 9. Semiconductors and Insulators.- 9.1 Ground-State Correlations.- 9.2 Excited States.- 10. Homogeneous Metallic Systems.- 10.1 Fermi-Liquid Approach.- 10.2 Charge Screening and the Random-Phase Approximation.- 10.3 Spin Fluctuations.- 11. Transition Metals.- 11.1 CorrelatedGround State.- 11.2 Excited States.- 11.3 Finite Temperatures.- 12. Strongly Correlated Electrons.- 12.1 Molecules.- 12.2 Anderson Hamiltonian.- 12.3 Effective Exchange Hamiltonian.- 12.4 Magnetic Impurity in a Lattice of Strongly Correlated Electrons.- 12.5 Hubbard Hamiltonian.- 12.6 The t — J Model.- 12.7 Slave Bosons in the Mean-Field Approximation.- 12.8 Kanamori’s t-Matrix Approach.- 13. Heavy-Fermion Systems.- 13.1 The Fermi Surface and Quasiparticle Excitations.- 13.2 Model Hamiltonian and Slave Bosons.- 13.3 Application of the Noncrossing Approximation.- 13.4 Variational Wavefunctions.- 13.5 Quasiparticle Interactions.- 13.6 Quasiparticle-Phonon Interactions Based on Strong Correlations.- 14. Superconductivity and the High-Tc Materials.- 14.1 The Superconducting State.- 14.2 Electronic Properties of the High-Tc Materials.- 14.3 Other Properties of the Cuprates.- 14.4 Heavy Fermions in Nd2_xCexCuO4.- B. Derivation of Several Relations Involving Cumulants.- C. Projection Method of Mori and Zwanzig.- D. Cross-Over from Weak to Strong Correlations.- E. Derivation of a General Form for ??).- F. Hund’s Rule Correlations.- G. Cumulant Representation of Expectation Values and Correlation Functions.- H. Diagrammatic Representation of Certain Expectation Values.- I. Derivation of the Quasiparticle Equation.- J. Coherent-Potential Approximation.- K. Derivation of the NCA Equations.- L. Ground-State Energy of a Heisenberg Antiferromagnet on a Square Lattice.- M. The Lanczos Method.- References.

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