PROPAGATION OF ELECTROMAGNETIC WAVES

Author: DELGADO ACOSTA FERNANDO.
Year: 2005.
University: PAÍS VASCO [www.ehu.es].
Place of defense: FACULTAD DE CIENCIA Y TECNOLOGÍA.
Place of preparation: FACULTAD DE CIENCIAS Y TECNOLOGÍA.

Summary: This thesis deals with the characteristic times and controlling the dynamics in one-dimensional quantum systems. It covers both fundamentals and practical dela unit temporarily. The investigation of the most fundamental fall "tuneleo" ultra spread, times of arrival and the dynamic stress handling of the transport properties of a semiconductor device and the control of ultra-cold atoms in atomic chips. One aspect of the work is to highlight that although the issue of time in Quantum Mechanics is now a matter of debate, the same treatment in most of the thesis has been done following the standard tools and concepts of quantum theory, avoiding most controversial issues, trying to characterize, understand and possibly control of time-dependent phenomena. Among the results found would emphasize the spread "superlumínica" signal means slightly absorbent and full description of the precursors of quantum waves in a position to tuneleo, both in the case and in the non-relativistic relativistic, while from the point of practically speaking, we have found explicit formulas for the process of loading and unloading as well as resonances for the entrapment permanent resonant states in the so-called "quantum dots", also considering some non-linear effects of the electronic interaction. Finally, we study, the arrival times proposing a description by an operator time auto-adjunto, avoiding known objection Pauli through confinement in a box.

Author: NAVARRO TORRES BEATRIZ.
Year: 2005.
University: PAÍS VASCO [www.ehu.es].
Place of defense: FACULTAD DE CIENCIAS.
Place of preparation: FACULTAD DE CIENCIAS Y TECNOLOGÍA DE LA UPV/EHU.

Summary: The research project in this thesis fits within the field of quantum optics, and its main objective has been studying the effects that occur due to the interaction between an atom ultrafío two levels and a moving laser field located in a certain region of space. One of the effects encountered is the removal of the Rabi oscillations when the atom enters the region illuminated by the laser, which depends on the speed of impact of the atom in the region and is a method of selecting states: regardless of the state of incidence, the final state can be selected by varying parameters such as laser intensity and untuned. It has studied the optical analogy of this suppression effect in terms of the optical activity and the polarization of light interacting with half optically active. To model the physical interaction between the atom and the laser, we obtained a potential complex accurate, and not dependent on local power, which in certain limit can be approximated by a potential local and dependent on the energy, which can be approximated by a certain limit a potential local and independent energy, which in turn justifies the use of this type of potential models of measurement times, in particular measures arrival times of particles subject to potential external. Finally, using the potential complex have proposed two methods of detection perfect ultracold atoms and have this potential compared with other potential perfect absorbent based arguments semiclásicos.