{"id":57044,"date":"2018-03-09T22:44:50","date_gmt":"2018-03-09T22:44:50","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/estudio-numerico-y-asintotico-de-modelos-discretos-en-fisica-de-semiconductores\/"},"modified":"2018-03-09T22:44:50","modified_gmt":"2018-03-09T22:44:50","slug":"estudio-numerico-y-asintotico-de-modelos-discretos-en-fisica-de-semiconductores","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/matematicas\/estudio-numerico-y-asintotico-de-modelos-discretos-en-fisica-de-semiconductores\/","title":{"rendered":"Estudio numerico y asintotico de modelos discretos en fisica de semiconductores"},"content":{"rendered":"<h2>Tesis doctoral de <strong> Guido Dell Acqua <\/strong><\/h2>\n<p>Esta tesis presenta el estudio y el desarrollo de modelos de transporte de carga el\u00e9ctrica en superredes semiconductoras. Las superredes semiconductoras son sistemas fuertemente no lineales cuasi-unidimensionales, formados por una sucesi\u00f3n de barreras y pozos de potencial, y cuya riqueza radica en la gran variedad de patrones y comportamientos distintos que se encuentran variando los par\u00e1metros f\u00edsicos involucrados.  despu\u00e9s una breve introducci\u00f3n en la que se presentan las caracter\u00edsticas principales del transporte electr\u00f3nico en estos sistemas, el contenido de la tesis se centra en el caso particular de las superredes d\u00e9bilmente acopladas. El comportamiento de dispositivos basados en estas superredes lo describe un modelo, propuesto por luis l. Bonilla en 1994, en el que el mecanismo de t\u00fanel resonante secuencial es el principal responsable del transporte de carga. El modelo consiste en un sistema de ecuaciones diferenciales no lineales acopladas, cuyo n\u00famero viene determinado por el n\u00famero de periodos de la superred, y que representan la continuidad de carga y la ecuaci\u00f3n de poisson en cada pozo de la superred. En este modelo, toda la informaci\u00f3n cu\u00e1ntica est\u00e1 recogida en la funci\u00f3n de densidad de corriente t\u00fanel a trav\u00e9s de la barrera que separa dos pozos cu\u00e1nticos. tras la descripci\u00f3n del modelo, la memoria presenta los resultados principales del estudio realizado. Estudiamos entonces los estados estacionarios del sistema, construimos  num\u00e9ricamente la curva estacionaria i-v, y elaboramos un an\u00e1lisis de estabilidad lineal de las ramas estacionarias. Este an\u00e1lisis presenta la posible existencia de bifurcaciones de hopf,     que son a su vez estudiamos mediante un desarrollo en escalas m\u00faltiples que nos lleva a una ecuaci\u00f3n de amplitud. Por otra parte, la memoria presenta una amplia descripci\u00f3n de los m\u00e9todos num\u00e9ricos utilizados mediante los cuales hemos podido caracterizar num\u00e9ricamente la respuesta del sistema a diferentes manip<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Estudio numerico y asintotico de modelos discretos en fisica de semiconductores<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Estudio numerico y asintotico de modelos discretos en fisica de semiconductores <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Guido Dell Acqua <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Carlos III de Madrid<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 15\/02\/2007<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h3>Direcci\u00f3n y tribunal<\/h3>\n<ul>\n<li><strong>Director de la tesis<\/strong>\n<ul>\n<li>Luis L\u00f3pez Bonilla<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: Gloria Platero Coello <\/li>\n<li>T Grahn Holger (vocal)<\/li>\n<li>Ana Carpio Rodriguez (vocal)<\/li>\n<li>Renato Spigler (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Guido Dell Acqua Esta tesis presenta el estudio y el desarrollo de modelos de transporte de carga [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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