Tosi, Leandro (2015) Interferencia y acoplamiento electrón-fonón en las propiedades de transporte de sistemas nanoscópicos fuertemente correlacionados. / Interference and electron-phonon coupling in the transport properties of strongly correlated nanoscopic system. Tesis Doctoral en Física, Universidad Nacional de Cuyo, Instituto Balseiro.
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Resumen en español
En esta tesis se ha abordado la cuestión del efecto de las correlaciones fuertes y del acoplamiento electrón-fonón en las propiedades de transporte de los sistemas nanoscópicos que exhiben fenómenos de interferencia. Hemos desarrollado un modelo para describir la interferencia en los sistemas interactuantes de muchos cuerpos y caracterizado este modelo en diferentes límites relevantes de alta simetría. El modelo consiste en dos dobletes que están acoplados a un par de cables de fuente-sumidero. De los cuatro coeficientes de acoplamiento, tres se pueden hacer reales y positivos. La fase compleja que queda en uno de los acoplamientos permite tener en cuenta la interferencia y puede ser relacionada con la simetría de los estados y la geometría de la conexión. Las propiedades de transporte se han calculado mediante la extensión de la aproximación non-crossing (NCA) fuera de equilibrio en el formalismo de Keldysh. Los resultados muestran las consecuencias de la interacción entre la interferencia cuántica y el efecto Kondo que puede conducir incluso a una conductancia cero causada por la interferencia total destructiva en el límite de alta simetría. También hemos explorado el papel de los grados de libertad orbitales en un sistema de dos puntos cuánticos. Hemos llevado a cabo un cálculo fuera de equilibrio de las propiedades de transporte que describen cualitativamente experimentos recientes. Con el fin de incluir el efecto de las vibraciones, que pueden ser muy importantes en las moléculas, hemos tratado primero el caso de un único doblete en el límite Kondo acoplado a un único modo bosónico. Hemos resuelto el problema completo del acoplamiento a los cables conductores y a los fonones en pie de igualdad con NCA y presentamos el efecto sobre las propiedades de transporte en el régimen Kondo. También presentamos los primeros resultados del efecto de las vibraciones en nuestro modelo de interferencia calculados en equilibrio. En la última parte presento mis resultados experimentales sobre el efecto Hall cuántico entero medido en gases de electrones bidimensionales.
Resumen en inglés
In this thesis we have addressed the question of the effect of strong correlations and electron-phonon coupling on the transport properties of nanoscopic systems exhibiting interference phenomena.We have developed a model to describe interference in many-body interacting systems and characterized this model in different relevant limits of high symmetry. The model consists on two doublets which are coupled to a pair of source-drain conducting leads. From the four coupling coefficients, three can be made real and positive. The remaining complex phase in one of the couplings allows to take into account the interference. It can be related with the symmetry of the states and with the geometry of the conection. The transport properties have been calculated using the extension of the non-crossing approximation (NCA) out of equilibrium in the Keldysh formalism. The results show the consequences of the interplay between quantum interference and Kondo effect which may lead to a zero conductance due to the total destructive interference in the high symmetry limit.We have also explored the role of orbital degrees of freedom in a double-quantum dot system. We have performed a full out of equilibrium calculation of the transport properties which describe cualitatively recent experiments. In order to include the effect of vibrations, which may be very important in molecules, we have first treated the case of one doublet in the Kondo limit coupled to a single bosonic mode. We have solved the complete problem of the coupling to the conducting leads and the phonons in equal footing with NCA and present here the effect of vibrations on the transport properties in the Kondo regime. We also present the first results of the effect of phonons in our interference model calculated in equilibrium. In the last part I present my experimental results on the integer quantum Hall effect measured on two-dimensional electron gases.
| Tipo de objeto: | Tesis (Tesis Doctoral en Física) |
|---|---|
| Palabras Clave: | Kondo effect; Efecto Kondo; Hall effect; Efecto hall; [Quantum transport; Transporte cuántico; Quantum interference; Correlated systems; Sistemas correlacionados; Molecular electronics; Electrónica molecular] |
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| Materias: | Física > Transporte cuántico |
| Divisiones: | Investigación y aplicaciones no nucleares > Física > Bajas temperaturas |
| Código ID: | 865 |
| Depositado Por: | Tamara Cárcamo |
| Depositado En: | 24 Feb 2021 10:49 |
| Última Modificación: | 24 Feb 2021 10:49 |
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