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Polarons in Bulk Materials and Systems With Reduced Dimensionality.

Author: G Iadonisi
Publisher: IOS Press, 2006.
Edition/Format:   eBook : Document : EnglishView all editions and formats
Summary:
An enormous theoretical effort has been made to treat electron-phonon coupled systems, with particular emphasis on Many Body aspects for dense electron systems, taking into account continuum as well as lattice polaron effects. Treating such aspects of polaron theory has been made possible because of powerful Many Body techniques which include: Exact Diagonalization techniques, Quantum Monte Carlo approaches, Density  Read more...
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Genre/Form: Electronic books
Additional Physical Format: Print version:
Material Type: Document, Internet resource
Document Type: Internet Resource, Computer File
All Authors / Contributors: G Iadonisi
ISBN: 1306464323 9781306464321 1614990174 9781614990178
OCLC Number: 871642568
Description: 1 online resource
Contents: Title Page; Indice; Preface; Gruppo fotografico dei partecipanti al Corso; Introduction to polaron physics: Basic concepts and models; Introduction; The Frohlich large polaron; Polarons in ionic crystals; Polarons in non-polar covalent materials; Polarons in metals; The Holstein small polaron; Self-trapping; Some early experimental insights; Bipolaron dissociation and recombination in WO 3-x; Photoinduced polaronic charge carriers in high-Tc cuprates; Bipolaronic charge ordering in Ti4O7; Summary; Frohlich polarons from 3D to 0D: Concepts and recent developments; The polaron concept The Frohlich HamiltonianThe structure of the polaron excitation spectrum and optical absorption by polarons; Optical absorption at weak coupling; Optical absorption at strong coupling; Optical absorption of continuum polarons at arbitrary coupling; Sum rules for the optical conductivity spectra; Scaling relations for Frohlich polarons; Check of the scaling relation for the path-integral Monte Carlo results for the polaron free energy; Magnetoabsorption spectra of polarons; Many-polaron systems; Ground state and the optical absorption spectra of many-polaron systems Many-polaron cyclotron resonance in quantum wellsInteracting polarons in a quantum dot; Appendix. On the contributions of the N-phonon states to the polaron ground state; Effects of strong charge-lattice coupling on the optical conductivity of transition metal oxides; Introduction; Large-polaron absorption in high-Tc cuprates; Small-polaron absorption in nickelates; Jahn-Teller and Hund's effects on the optical conductivity of manganites; Fano resonances in cobaltates and cuprates; Infrared signatures of charge ordering in transition metal oxides; Conclusion On the local lattice displacements in the correlated transition metal oxidesIntroduction; EXAFS as a probe of local lattice displacements; Local lattice displacements in the copper oxide superconductors; Local Cu-O displacements as a function of doping; Critical role of Cu-O displacements; Characteristic Cu-O displacements in the copper oxides; Mn-O displacements in the charge-ordered and CMR manganese oxides; Large local displacements in the charge-ordered nickel oxides; Concluding remarks; Polarons in complex oxides: CMR manganites and HTSC cuprates; Introduction; Polarons in CMR manganites Observation of spin-lattice polarons in manganites by neutron scattering and the percolative nature of metal-insulator transitionIonic size effect; Phonons and nanoscale phase separation in the cuprates; Electron-phonon interaction in HTSC cuprates; Dynamic polarons in HTSC cuprates; ARPES observations; Two-component model; Conclusions; Variational approaches to polarons; Introduction; Models for e-ph coupling models; A variational method for the Frohlich model; A variational method for the Holstein model; Coherent state basis for the Holstein model; Conclusions

Abstract:

An enormous theoretical effort has been made to treat electron-phonon coupled systems, with particular emphasis on Many Body aspects for dense electron systems, taking into account continuum as well as lattice polaron effects. Treating such aspects of polaron theory has been made possible because of powerful Many Body techniques which include: Exact Diagonalization techniques, Quantum Monte Carlo approaches, Density Matrix renormalization group and Dynamical Mean Field Theory. All these advances in polaron theory needed to be accompanied by: (i) an equally important advance in material researc.

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