{"id":36567,"date":"1998-01-01T00:00:00","date_gmt":"1998-01-01T00:00:00","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/resonancias-en-la-dinamica-cuantica-de-sistemas-magneticos-pequenos\/"},"modified":"1998-01-01T00:00:00","modified_gmt":"1998-01-01T00:00:00","slug":"resonancias-en-la-dinamica-cuantica-de-sistemas-magneticos-pequenos","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/fisica\/resonancias-en-la-dinamica-cuantica-de-sistemas-magneticos-pequenos\/","title":{"rendered":"Resonancias en la dinamica cuantica de sistemas magneticos peque\u00f1os."},"content":{"rendered":"<h2>Tesis doctoral de <strong>  Garcia Pablos Miro Daniel <\/strong><\/h2>\n<p>Las investigaciones presentadas en esta memoria de tesis doctoral constituyen un estudio computacional, desarrollado mediante c\u00e1lculos din\u00e1mico cu\u00e1nticos, de la respuesta de la imanaci\u00f3n de diferentes modelos de part\u00edculas magn\u00e9ticas ante la aplicaci\u00f3n de un campo magn\u00e9tico. Se ha centrado en la investigaci\u00f3n en profundidad de los fen\u00f3menos del efecto t\u00fanel cu\u00e1ntico de la imanaci\u00f3n y la coherencia cu\u00e1ntica temporal. Estos fen\u00f3menos han sido analizados mediante el c\u00f3mputo seg\u00fan las leyes de la mec\u00e1nica cu\u00e1ntica de la evoluci\u00f3n temporal a temperatura cero de part\u00edculas magn\u00e9ticas representadas por modelos de espines en presencia de campos magn\u00e9ticos que, en general, var\u00edan en el tiempo.  para ello se ha procedido a resolver num\u00e9ricamente la ecuaci\u00f3n de schrodinger dependiente del tiempo. Este enfoque no hab\u00eda sido adoptado previamente para el examen del problema que nos ocupa, la mayor\u00eda de las veces abordado mediante estudios semicl\u00e1sicos que no tienen en cuenta el car\u00e1cter discreto del espectro energ\u00e9tico de los sistema. El tratamiento del problema desde un punto de vista estrictamente mec\u00e1nico-cu\u00e1ntico permite explorar los fen\u00f3menos cu\u00e1nticos en diferentes sistemas magn\u00e9ticos de inter\u00e9s con el planteamiento m\u00e1s riguroso posible.  entre los resultados principales podemos destacar que, tras analizar la evoluci\u00f3n temporal en funci\u00f3n del campo magn\u00e9tico, el tama\u00f1o, la configuraci\u00f3n de los sistemas, el tipo de anisotrop\u00eda magn\u00e9tica y las diferentes clases de modelos, se ha encontrado que el \u00fanico mecanismo de efecto t\u00fanel relevante en estos sistemas es el efecto t\u00fanel resonante de la imanaci\u00f3n. Las resonancias ocurren cuando para un valor concreto del campo magn\u00e9tico aplicado dos niveles de energ\u00eda del sistema est\u00e1n pr\u00e1cticamente degenerados. La evoluci\u00f3n de los espines es coherente \u00fanicamente para estos valores resonantes del campo. Este resultado no hab\u00eda sido obtenido previame<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Resonancias en la dinamica cuantica de sistemas magneticos peque\u00f1os.<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Resonancias en la dinamica cuantica de sistemas magneticos peque\u00f1os. <\/li>\n<li><strong>Autor:<\/strong>\u00a0  Garcia Pablos Miro Daniel <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Aut\u00f3noma de Madrid<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 01\/01\/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>Nicolas Garcia Garcia<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal:  Fdez\/ra\u00f1ada Menendez De Luarca Antonio <\/li>\n<li>Hans De Raedt (vocal)<\/li>\n<li>Antonio Hernando Grande (vocal)<\/li>\n<li>Bernard Barbara (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Garcia Pablos Miro Daniel Las investigaciones presentadas en esta memoria de tesis doctoral constituyen un estudio computacional, [&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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