Andrade Hoyos, Jhon A. (2017) Propiedades ópticas y de transporte en arreglos de puntos cuáticos. / Optical and transport properties in quantum dot arrays. Tesis Doctoral en Física, Universidad Nacional de Cuyo, Instituto Balseiro.
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Resumen en español
En esta tesis se analizan las propiedades ópticas y de transporte de dispositivos de puntos cuánticos, donde las interacciones generan regímenes altamente correlacionados y fenómenos de muchos cuerpos. En esta tesis se presentan resultados obtenidos utilizando principalmente el grupo de renormalización numérica de Wilson, complementado con técnicas analíticas basadas en la teoría de líquidos de Fermi, bosones esclavos y cálculos variacionales. Con estas herramientas se exploran sistemas de arreglos de puntos cuánticos acoplados entre ellos y a conductores que proporcionan una rica variedad de fenómenos físicos tales como el efecto Kondo regular, sub-apantallado y ferromagnético. Estos podrían ser utilizados en aplicaciones que hagan uso de sus propiedades dinámicas, de transporte, termoeléctricas y termomagnéticas, gracias a la gran sensibilidad que tienen a campos eléctricos y magnéticos. Esta alta sensibilidad provee grandes valores en el poder termoeléctrico de carga y de espín, donde este último conlleva corrientes de polarización de espín, útil en aplicaciones de espintrónica. Por otro lado, analizamos resultados experimentales de fotoluminiscencia en el decaimiento de un trión y de excitones de diferentes cargas en un punto cuántico, en la que efectos de muchos cuerpos dan lugar a fenómenos como la catástrofe de ortogonalidad de Anderson, efectos de ensanchamiento en la intensidad en el espectro de fotoluminiscencia, corrimiento de las líneas de intensidad hacia el rojo o azul dependiendo del régimen de excitación.
Resumen en inglés
In this thesis, we analyze the optical and transport properties of quantum dots devices, where the interaction generates highly correlated regimes and many-body phenomena. In this thesis, we use Wilson's numerical renormalization group complemented by analytical techniques based on Fermi liquid theory, slave bosons and variational calculations. With those tools, we explore systems of quantum dot arrays coupled between themselves and to conductors which provide a rich variety of physical phenomena such as the regular, underscreened and ferromagnetic Kondo effects. Those systems could be used in applications that utilize their dynamics, transport, thermoelectric, and thermomagnetic properties, owing to the great sensitivity that they have to electric and magnetic fields. This great sensitivity provides large values in the charge and spin thermopower, the latter leading to spin polarization currents, useful in spintronic applications. On the other hand, we analyze experimental results of the photoluminescence in the trion and exciton decays of different charges of a quantum dot, where many body effects lead to phenomena such as the Anderson's orthogonality catastrophe, effects of widening on the intensity of the photoluminescence spectrum, and red and blue shift of intensity lines depending on the excitation regime.
| Tipo de objeto: | Tesis (Tesis Doctoral en Física) |
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| Información Adicional: | Área Temática: Teoría de la materia condensada. |
| Palabras Clave: | Kondo effect; Efecto Kondo, Optical properties, Propiedades ópticas, Ferrimagnetism; Ferrimangnétismo; [Quantum dot; Punto cuántico] |
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| Materias: | Física |
| Divisiones: | Gcia. de área de Investigación y aplicaciones no nucleares > Gcia. de Física > Materia condensada > Teoría de sólidos |
| Código ID: | 613 |
| Depositado Por: | Tamara Cárcamo |
| Depositado En: | 19 Jun 2017 13:53 |
| Última Modificación: | 19 Jun 2017 13:53 |
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