{"id":38366,"date":"1998-01-07T00:00:00","date_gmt":"1998-01-07T00:00:00","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/electrones-correlacionados-en-torno-a-singularidades-de-van-hove\/"},"modified":"1998-01-07T00:00:00","modified_gmt":"1998-01-07T00:00:00","slug":"electrones-correlacionados-en-torno-a-singularidades-de-van-hove","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/fisica\/electrones-correlacionados-en-torno-a-singularidades-de-van-hove\/","title":{"rendered":"Electrones correlacionados en torno a singularidades de van hove"},"content":{"rendered":"<h2>Tesis doctoral de <strong> Jos\u00e9 Vicente Alvarez Carrera <\/strong><\/h2>\n<p>Se aborda el problema de los electrones correlacionados en las proximidades de singularidades de van hove. Esta cuestion es revelante para ayudar a comprender las propiedades fisicas de los superconductores de alta temperatura.  se ha elegido el modelo hubbard t-t\u00c2\u00bfpara centrar todas las discusiones y c\u00e1lculos que se han realizado. El modelo de hubbard t-t\u00c2\u00bf, ademas de contener todos los elementos esenciales para discutir este problema, tiene el interes adicional de que reproduce otras propiedades generales de los oxidos de cobre.  se deduce un modelo efectivo renormalizable para los electrones cercanos a una singularidad de van hove y se obtiene el diagrama de fases del modelo repulsivo en funcion de u y t\u00c2\u00bfal llenado de la singularidad con tecnicas de grupo de renormalizacion.  se determina el estado fundamental del modelo de hubbard t-t\u00c2\u00bfen la red 4&#215;4 en funcion de u y t\u00c2\u00bfpor el metodo de la diagonalizacion exacta. Tambien se calcula el valor medio del operador numero en espacio de momentos para el estado fundamental y se comprueba el llenado de los puntos de silla en el regimen de acoplo fuerte.  se deduce un modelo efectivo renormalizable con interrelaciones extendidas y se analiza el efecto de estas interrelaciones en el diagrama del modelo de hubbard reclusivo. Por ultimo se establece un diagrama de fases del modelo de hubbard t-t\u00c2\u00bfcon u menor que 0.  se incluye ap\u00e9ndice con el origen y la descripci\u00f3n del modelo de hubbard.  tambien se incluye bibliografia.<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Electrones correlacionados en torno a singularidades de van hove<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Electrones correlacionados en torno a singularidades de van hove <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Jos\u00e9 Vicente Alvarez Carrera <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Carlos III de Madrid<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 01\/07\/1998<\/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>Jose Gonzalez Carmona<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: Luis L\u00f3pez bonilla <\/li>\n<li>german Sierra rodero (vocal)<\/li>\n<li>enrique Louis cereceda (vocal)<\/li>\n<li>Jaime Ferrer rodr\u00edguez (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Jos\u00e9 Vicente Alvarez Carrera Se aborda el problema de los electrones correlacionados en las proximidades de singularidades [&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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