Quantum Theory

Download e-book for iPad: Coherent Dynamics of Complex Quantum Systems by Professor Vladimir M. Akulin (auth.)

By Professor Vladimir M. Akulin (auth.)

ISBN-10: 3540210520

ISBN-13: 9783540210528

ISBN-10: 3540292713

ISBN-13: 9783540292715

quite a few glossy difficulties in physics, chemistry, and quantum electronics require a attention of inhabitants dynamics in advanced multilevel quantum structures. the aim of this booklet is to supply a scientific therapy of those questions and to offer a few precisely solvable difficulties. It considers different dynamical difficulties often encountered in several components of physics from a similar point of view, dependent often at the basic principles of workforce concept and at the notion of ensemble typical. additionally handled are options of entire quantum regulate and correction of decoherence triggered mistakes which are complementary to the belief of ensemble regular. "Coherent Dynamics of complicated Quantum structures" is aimed toward senior-level undergraduate scholars within the components of Atomic, Molecular, and Laser Physics, actual Chemistry, Quantum Optics and Quantum Informatics. it's going to support them positioned specific difficulties in those fields right into a broader clinical context and thereby make the most of the well-elaborated means of the adjoining fields.

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Example text

Fig. 16. The classical trajectory of an electron (dashed line) in a hot cluster. Scattering of the electron occures at impurities (i), at phonons (p), and at the perturbed surface (s) of the spherical “in average” cluster. The random character of the thermal motion suggests the consideration of the perturbation as random. Indeed, in the classical limit the trajectory of an electron moving in the potential well resembles the trajectory of a particle in Sinai billiard theory (see Fig. 16): elastic scattering at thermal phonons at irregularities of the surface and at atomic cores makes the electronic motion chaotic.

36) of the cluster via a random matrix with the mean squared matrix element V 2 depending on temperature T . One can estimate this quantity by noticing that the electron–phonon coupling is the main mechanism of the temperaturedependent conductivity of metals, and the relaxation time of the electronic momentum τ (T ) equals the inverse of the relaxation probability 2π V 2 gf , 46 2 Examples of Complex Systems where gf is a typical one-electron state density near the Fermi energy of the cluster. 38) give the unperturbed Hamiltonian ˆ 0 .

The increasing density of resonances gn compensates for the decreasing coupling Vn . 19) where ψ 0 denotes the amplitude of the ground state of the system, and the excited states with the amplitudes ψ m are detuned from the resonant positions of one- or multiphoton resonances by the energy ∆m . One of the possibilities to tackle the problem is to model the interaction and detunings by random values. This model should however allow for large differences in the typical matrix elements of interactions, that correspond to different orders of resonances.

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Coherent Dynamics of Complex Quantum Systems by Professor Vladimir M. Akulin (auth.)

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