Dissipative Quantum Chaos And Decoherence

Employing a two dimensional electron gas in a semiconductor as a normal conductor opens up the possibility to observe effects not found in purely metallic junctions.By combining heterostructures with su perconductors, many of the effects found in purely semiconductor systems can in a sense, be transferred to the superconducting state. Special care is taken on explaining the underlying theoretical concepts related to the transport mech anisms.

Recent advances in semiconductor technology have made it possible to fabricate microcavity structures in which both photon fields and electron-hole pairs (or excitons) are confined in a small volume comparable to their wavelength. The radiative properties of the electron-hole pairs and excitons are modified owing to the drastic change in the structure of the electromagnetic-field modes. Semiconductor Cavity Quantum Electrodynamics.This book is the first to give a comprehensive account of the theory of semiconductor cavity quantum electrodynamics for such systems in the weak-coupling and strong-coupling regimes.

The Hubbard model describes a Mott transition with a mere minimum of tunable par- eters, and various exact statements and even exact solutions exist in certain limiting cases. Little do we reliably know about the Mott transition, and we are far from a complete understanding of the metal --insulator transition due to electr- electron interactions.

On the other hand it contains the author's own results in the field of preparation and characterization.In order to produce suitable conductors with material properties which meet the challenge imposed by energy technology, detailed understanding of the phase formation and physical properties of the high temperature super conductors is necessary. The goal of this book is on one hand to provide the basic information on phase formation and physical properties, and to give a short overview of the state of the art in conductor preparation and character ization. High-Tc Superconductors for Magnet and Energy Technology.

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These tools allow for the accurate determination of the composition of ternary semiconductor nanostructures with a spatial resolution at near atomic scales.

. It includes more than 100 illustrations, figures and tables as well as many previously unpublished results.The text gives an overview of the topic and discusses possible applications. Electronic Defect States in Alkali Halides rare earth elements) and neighbouring molecular defects (OH-, CN-) in alkali halides.

The main emphasis is on the development of a semiclassical formalism that allows one to incorporate the effect of dissipation and decoherence in a precise, yet tractable way into the quantum mechanics of classically chaotic systems.. The formalism is employed to reveal how the spectrum of the quantum mechanical propagator of a density matrix is determined by the spectrum of the corresponding classical propagator of phase space density.

It includes more than 100 illustrations, figures and tables as well as many previously unpublished results. Electronic Defect States in Alkali Halides rare earth elements) and neighbouring molecular defects (OH-, CN-) in alkali halides. It covers a wide range of spectroscopic methods applied to the systems and reviews several approaches for their theoretical interpretation.

Dissipative Quantum Chaos and Decoherence Simple quantum--classical hybrid formulae for experimentally relevant correlation functions and time-dependent expectation values of observables are derived. The formalism is employed to reveal how the spectrum of the quantum mechanical propagator of a density matrix is determined by the spectrum of the corresponding classical propagator of phase space density.. The problem of decoherence is treated in detail, and highly unexpected cases of very slow decoherence are revealed, with important consequences for the long-debated realizability of Schrödinger cat states as well as for the construction of quantum computers.