Polarons in Bulk Materials and Systems with Reduced Dimensionality: Varenna on Lake Como, Villa Monastero, 21 June-1 July 2005
"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 research which produced many new materials such as the high Tc cuprates, the manganites and nickelates and the fullerines; (ii) as well as significant advances in the refinement of experimental analysis and, in particular, the spectroscopic means such as Angel Resolved Photoemission Spectroscopy, X Ray Absorption Spectroscopy (EXAFS, XANES), Pulsed Neutron Diffraction measurements allowing to study the local dynamical lattice de-formations and optical spectroscopy including time resolved measurements. The scope and purpose of this publication is to review both these theoretical and experimental advances which occurred over the last few decades and to introduce the study of such systems, where both strong electron-electron correlations and large electron-phonon coupling strengths play important roles."
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absorption spectrum adiabatic antiadiabatic approach approximation atomic bipolarons bond bosonic calculated charge carriers correlation corresponding coupling constant crossover Cu-O cuprates density density matrix Devreese J. T. displacements distortions DMFT DMRG doping dotted dynamical edited effective electron electron-lattice electron-phonon coupling electron-phonon interaction EP coupling EXAFS excitations experimental Fehske H Fermi fermions finite Fisica Frohlich polaron Green's function Hamiltonian high-Tc Hilbert space Holstein Holstein model Hubbard model insulating ionic ions large polarons lattice deformations Lett limit localised manganites many-polaron matrix metallic method Mn-O Mott insulating obtained optical absorption optical conductivity oscillator oxides pairs panel parameters peak phase phonon phonon frequency Phys Physics polarization polaron polaron band potential problem properties quantum quasiparticle Ranninger regime renormalization resonance self-energy self-trapped shows small polarons solid spectral function spectral weight spectrum spin strong-coupling structure superconducting t-J model temperature theory transition vector wave function weak-coupling