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Exciton theory. --- Quasiparticles (Physics) --- Elementary excitations --- Excitations, Elementary --- Quasi particles (Physics) --- Particles (Nuclear physics) --- Quantum theory --- Electron-hole pair theory --- Excitons, Theory of --- Electrons --- Photons --- Solids --- Transport theory

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Excitons are considered as the basic concept used by describing the spectral properties of photosynthetic pigment-protein complexes and excitation dynamics in photosynthetic light-harvesting antenna and reaction centers. Following the recently obtained structures of a variety of photosynthetic pigment-protein complexes from plants and bacteria our interest in understanding the relation between structure, function and spectroscopy has strongly increased. These data demonstrate a short interpigment distance (of the order of 1 nm or even smaller) and/or a highly symmetric (ring-like) arrangement

Exciton theory. --- Photosynthesis. --- Electronic excitation. --- Energy transfer. --- Molecular spectroscopy. --- Energy storage --- Force and energy --- Transport theory --- Excitation, Electronic --- Electrons --- Exciton theory --- Photobiology --- Plants --- Gases from plants --- Electron-hole pair theory --- Excitons, Theory of --- Photons --- Quantum theory --- Solids --- Spectroscopy, Molecular --- Spectrum analysis --- Molecular spectra --- Effect of light on --- Photorespiration

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A new class of insulating solids was recently discovered. Whenirradiated by a few visible photons, these solids give rise to amacroscopic excited domain that has new structural and electronicorders quite different from the starting ground state. This occurrenceis called ""photoinduced phase transition"", and this multi-authoredbook reviews recent theoretical and experimental studies of this newphenomenon.

Exciton theory. --- Phase transformations (Statistical physics) --- Charge transfer --- Ionic crystals --- High spin physics. --- High energy spin physics --- High spin nuclear levels --- High spin states (Physics) --- Nuclear physics --- Transfer, Charge --- Collisions (Nuclear physics) --- Electron donor-acceptor complexes --- Electrons --- Ion exchange --- Mass transfer --- Phase changes (Statistical physics) --- Phase transitions (Statistical physics) --- Phase rule and equilibrium --- Statistical physics --- Electron-hole pair theory --- Excitons, Theory of --- Photons --- Quantum theory --- Solids --- Transport theory --- Research. --- Spectra.

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This book discusses group theory investigations of zincblende and wurtzite semiconductors under symmetry-breaking conditions. The text presents the group theory elements required to develop a multitude of symmetry-breaking problems, giving scientists a fast track to bypass the need for recalculating electronic states. The text is not only a valuable resource for speeding up calculations but also illustrates the construction of effective Hamiltonians for a chosen set of electronic states in crystalline semiconductors. Since Hamiltonians have to be invariant under the transformations of the point group, the crystal symmetry determines the multiplet structure of these states in the presence of spin-orbit, crystal-field, or exchange interactions. Symmetry-breaking leads to additional coupling of the states, resulting in shifts and/or splittings of the multiplets. Such interactions may be intrinsic, as in the case of the quasi-particle dispersion, or extrinsic, induced by magnetic, electric, or strain fields. Using a power expansion of the perturbations these interaction terms can be determined in their parameterized form in a unique way. The hierarchic structure of this invariant development allows to estimate the importance of particular symmetry-breaking effects in the Hamiltonian. A number of selected experimental curves are included to illustrate the symmetry-based discussions, which are especially important in optical spectroscopy. This text is written for graduate students and researchers who want to understand and simulate experimental findings reflecting the fine structure of electronic or excitonic states in crystalline semiconductors. .

Mathematical physics. --- Solid State Physics. --- Semiconductors. --- Mathematical Methods in Physics. --- Physical mathematics --- Physics --- Mathematics --- Symmetry (Physics) --- Exciton theory. --- Electron-hole pair theory --- Excitons, Theory of --- Electrons --- Photons --- Quantum theory --- Solids --- Transport theory --- Invariance principles (Physics) --- Symmetry (Chemistry) --- Conservation laws (Physics) --- Crystalline semiconductors --- Semi-conductors --- Semiconducting materials --- Semiconductor devices --- Crystals --- Electrical engineering --- Electronics --- Solid state electronics --- Materials --- Solid state physics. --- Physics. --- Natural philosophy --- Philosophy, Natural --- Physical sciences --- Dynamics --- Condensed matter. --- Condensed Matter Physics. --- Condensed materials --- Condensed media --- Condensed phase --- Materials, Condensed --- Media, Condensed --- Phase, Condensed --- Liquids --- Matter

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This thesis presents results crucial to the emerging field of indirect excitons. These specially designed quasiparticles give the unique opportunity to study fundamental properties of quantum degenerate Bose gases in semiconductors. Furthermore, indirect excitons allow for the creation of novel optoelectronic devices where excitons are used in place of electrons. Excitonic devices are explored for the development of advanced signal processing seamlessly coupled with optical communication. The thesis presents and describes the author's imaging experiments that led to the discovery of spin transport of excitons. The many firsts presented herein include the first studies of an excitonic conveyer, leading to the discovery of the dynamical localization-delocalization transition for excitons, and the first excitonic ramp and excitonic diode with no energy-dissipating voltage gradient. .

Physics. --- Quantum physics. --- Phase transformations (Statistical physics). --- Condensed materials. --- Condensed matter. --- Low temperature physics. --- Low temperatures. --- Semiconductors. --- Quantum Gases and Condensates. --- Quantum Physics. --- Low Temperature Physics. --- Optics, Lasers, Photonics, Optical Devices. --- Exciton theory. --- Electron-hole pair theory --- Excitons, Theory of --- Electrons --- Photons --- Quantum theory --- Solids --- Transport theory --- Quantum theory. --- Quantum dynamics --- Quantum mechanics --- Quantum physics --- Physics --- Mechanics --- Thermodynamics --- Lasers. --- Photonics. --- New optics --- Optics --- Light amplification by stimulated emission of radiation --- Masers, Optical --- Optical masers --- Light amplifiers --- Light sources --- Optoelectronic devices --- Nonlinear optics --- Optical parametric oscillators --- Cryogenics --- Low temperature physics --- Temperatures, Low --- Temperature --- Cold --- Condensed materials --- Condensed media --- Condensed phase --- Materials, Condensed --- Media, Condensed --- Phase, Condensed --- Liquids --- Matter --- Phase changes (Statistical physics) --- Phase transitions (Statistical physics) --- Phase rule and equilibrium --- Statistical physics --- Crystalline semiconductors --- Semi-conductors --- Semiconducting materials --- Semiconductor devices --- Crystals --- Electrical engineering --- Electronics --- Solid state electronics --- Materials