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Correlation Functions and Quasiparticle Interactions in Condensed Matter

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概要 This volume contains the proceedings of a NATO Advanced Study Institute devoted to the study of dynamical correlation functions of the form (I) J~e-lwt<A(O)B(O)A(t)B(t{raquo}dt where A and B are physi...cal operations in the Heisenberg representa tion and -~ Tr(e --- ) < ... > 6ft T- is an equilibrium average. In equation (1) it is useful to regard the product AB as the product of two operators in cases in which A and B refer to different spatial points in a condensed matter sys tem and/or in which A and B behave dynamically in a quasiharmonic way. In the second case, one has a two quasiparticle correlation function and CAB;AB(w) gives information about quasiparticle inter actions. Condensed matter physics has increasingly turned its attention to correlation functions of this type during the last 15 years, partly because the two point and/or one-particle correlation functions have by now been very thoroughly studied in many cases. The study of four point and/or two quasiparticle correlations has proceeded somewhat independently in several diverse fields of condensed matter physics and it was one purpose of the institute to bring experts from these different fields together to describe the current state of their art to each other and to advanced students.続きを見る
目次 I. General Theory
Kubo and Zubarev Formulations of Response Theory
Perturbation Theory of Response Functions
Renormalization Group Approach to Dynamic Critical Phenomena
Nonlinear Response Theory
II. Magnetic Systems
Magnetic Excitations
A Green Function Approach to Two-Magnon Light Scattering in Antiferromagnets at T < TN
Two-Spin Light Scattering in Heisenberg Antiferromagnets
Two-Magnon Spectra of Ferromagnets
Light Scattering Determinations of Dynamic Four Point Correlation Functions
III. Liquids
Second-Order Light Scattering by Classical Fluids I: Collision Induced Scattering
Second-Order Light Scattering by Classical Fluids II: Double Light Scattering by Critical Fluids
Numerical Calculations in Classical Liquids
Optical Polarization in Molecular Dielectric Liquids
Rotational Relaxation of Solute Molecules in Dense Noble Gases
Spinodal Decomposition: An Outline
Mode Coupling Calculations of Critical Phenomena and Polymer Dynamics
Two Roton Raman Scattering in Superfluid He4
Roton Bound States in Liquid 4He
Integrated Raman Intensity in 4He
Response Function of the Superconducting Order Parameter
IV. Phonons
Second Order Phonon Spectra
Neutron Scattering and Interactions Between Excitations
Optical Response of Quantum Crystals
Anharmonic Interference in Scattering Experiments
List of Contributors.
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登録日 2020.06.27
更新日 2020.06.28