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- W1615637290 abstract "Decoherence in Optically Excited Semiconductors: a perspective from non-equilibrium Green functions Kuljit Singh Virk Doctor of Philosophy Graduate Department of Physics University of Toronto 2010 Decoherence is central to our understanding of the transition from the quantum to the classical world. It is also a way of probing the dynamics of interacting many-body systems. Photoexcited semiconductors are such systems in which the transient dynamics can be studied in considerable detail experimentally. Recent advances in spectroscopy of semiconductors provide powerful tools to explore many-body physics in new regimes. An appropriate theoretical framework is necessary to describe new physical effects now accessible for observation. We present a possible approach in this thesis, and discuss results of its application to an experimentally relevant scenario. The major portion of this thesis is devoted to a formalism for the multi-dimensional Fourier spectroscopy of semiconductors. A perturbative treatment of the electromagnetic field is used to derive a closed set of differential equations for the multi-particle correlation functions, which take into account the many-body effects up to third order in the field. A diagrammatic method is developed, in which we retain all features of the double-sided Feynman diagrams for bookkeeping the excitation scenario, and complement them by allowing for the description of interactions. We apply the formalism to study decoherence between the states of optically excited excitons embedded in an electron gas, and compare it with the decoherence between these states and the ground state. We derive a dynamical equation for the two-time" @default.
- W1615637290 created "2016-06-24" @default.
- W1615637290 creator A5004985593 @default.
- W1615637290 date "2010-04-21" @default.
- W1615637290 modified "2023-10-17" @default.
- W1615637290 title "Decoherence in Optically Excited Semiconductors: a perspective from non-equilibrium Green functions" @default.
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