Densidad de estados y transporte eléctrico en superconductores y sistemas periódicos nanoestructurados
ilustraciones, gráficas
- Autores:
-
Martínez Montero, Camilo Andrés
- Tipo de recurso:
- Doctoral thesis
- Fecha de publicación:
- 2021
- Institución:
- Universidad Nacional de Colombia
- Repositorio:
- Universidad Nacional de Colombia
- Idioma:
- spa
- OAI Identifier:
- oai:repositorio.unal.edu.co:unal/80401
- Palabra clave:
- 530 - Física
Superconductors
Electric conductivity
Superconductores
Conductividad eléctrica
Funciones de Green
Superconductividad
Grafeno
Bicapas de grafeno
Reflexiones de Andreev
Lentes de Veselago
Green functions
Superconductivity
Graphene
Bilayers graphene
Andreev reflection
Veselago lens
Carbono
Carbon
- Rights
- openAccess
- License
- Atribución-CompartirIgual 4.0 Internacional
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Densidad de estados y transporte eléctrico en superconductores y sistemas periódicos nanoestructurados |
| dc.title.translated.eng.fl_str_mv |
Density of states and electric transport in superconductors and systems with periodic nanoestructure |
| title |
Densidad de estados y transporte eléctrico en superconductores y sistemas periódicos nanoestructurados |
| spellingShingle |
Densidad de estados y transporte eléctrico en superconductores y sistemas periódicos nanoestructurados 530 - Física Superconductors Electric conductivity Superconductores Conductividad eléctrica Funciones de Green Superconductividad Grafeno Bicapas de grafeno Reflexiones de Andreev Lentes de Veselago Green functions Superconductivity Graphene Bilayers graphene Andreev reflection Veselago lens Carbono Carbon |
| title_short |
Densidad de estados y transporte eléctrico en superconductores y sistemas periódicos nanoestructurados |
| title_full |
Densidad de estados y transporte eléctrico en superconductores y sistemas periódicos nanoestructurados |
| title_fullStr |
Densidad de estados y transporte eléctrico en superconductores y sistemas periódicos nanoestructurados |
| title_full_unstemmed |
Densidad de estados y transporte eléctrico en superconductores y sistemas periódicos nanoestructurados |
| title_sort |
Densidad de estados y transporte eléctrico en superconductores y sistemas periódicos nanoestructurados |
| dc.creator.fl_str_mv |
Martínez Montero, Camilo Andrés |
| dc.contributor.advisor.none.fl_str_mv |
Gómez Páez, Shirley Javier Herrera, William |
| dc.contributor.author.none.fl_str_mv |
Martínez Montero, Camilo Andrés |
| dc.contributor.researchgroup.spa.fl_str_mv |
Superconductividad y nanotecnología |
| dc.subject.ddc.spa.fl_str_mv |
530 - Física |
| topic |
530 - Física Superconductors Electric conductivity Superconductores Conductividad eléctrica Funciones de Green Superconductividad Grafeno Bicapas de grafeno Reflexiones de Andreev Lentes de Veselago Green functions Superconductivity Graphene Bilayers graphene Andreev reflection Veselago lens Carbono Carbon |
| dc.subject.lemb.eng.fl_str_mv |
Superconductors Electric conductivity |
| dc.subject.lemb.spa.fl_str_mv |
Superconductores Conductividad eléctrica |
| dc.subject.proposal.spa.fl_str_mv |
Funciones de Green Superconductividad Grafeno Bicapas de grafeno Reflexiones de Andreev Lentes de Veselago |
| dc.subject.proposal.eng.fl_str_mv |
Green functions Superconductivity Graphene Bilayers graphene Andreev reflection Veselago lens |
| dc.subject.unesco.spa.fl_str_mv |
Carbono |
| dc.subject.unesco.eng.fl_str_mv |
Carbon |
| description |
ilustraciones, gráficas |
| publishDate |
2021 |
| dc.date.accessioned.none.fl_str_mv |
2021-10-06T17:51:55Z |
| dc.date.available.none.fl_str_mv |
2021-10-06T17:51:55Z |
| dc.date.issued.none.fl_str_mv |
2021 |
| dc.type.spa.fl_str_mv |
Trabajo de grado - Doctorado |
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info:eu-repo/semantics/doctoralThesis |
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info:eu-repo/semantics/acceptedVersion |
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http://purl.org/coar/resource_type/c_db06 |
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Text |
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http://purl.org/redcol/resource_type/TD |
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http://purl.org/coar/resource_type/c_db06 |
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acceptedVersion |
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https://repositorio.unal.edu.co/handle/unal/80401 |
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Universidad Nacional de Colombia |
| dc.identifier.reponame.spa.fl_str_mv |
Repositorio Institucional Universidad Nacional de Colombia |
| dc.identifier.repourl.spa.fl_str_mv |
https://repositorio.unal.edu.co/ |
| url |
https://repositorio.unal.edu.co/handle/unal/80401 https://repositorio.unal.edu.co/ |
| identifier_str_mv |
Universidad Nacional de Colombia Repositorio Institucional Universidad Nacional de Colombia |
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spa |
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spa |
| dc.relation.references.spa.fl_str_mv |
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Atribución-CompartirIgual 4.0 Internacionalhttp://creativecommons.org/licenses/by-sa/4.0/info:eu-repo/semantics/openAccesshttp://purl.org/coar/access_right/c_abf2Gómez Páez, Shirley0ea6badbbdb8f46c8a4cee73695e0fc3600Javier Herrera, Williamb9f233192430d2bb28179cf27953f2c0Martínez Montero, Camilo Andrésc2566057eef935b8ad51fdf8b03fc387Superconductividad y nanotecnología2021-10-06T17:51:55Z2021-10-06T17:51:55Z2021https://repositorio.unal.edu.co/handle/unal/80401Universidad Nacional de ColombiaRepositorio Institucional Universidad Nacional de Colombiahttps://repositorio.unal.edu.co/ilustraciones, gráficasEn este trabajo analizamos el efecto de un potencial de pares periódico sobre la densidad de estados y las propiedades de transporte en superconductores no convencionales, así como el efecto de superredes periódicas semi-infinitas o finitas que se presentan en heteroestructuras conformadas por grafeno y superconductores. Se analiza un material superconductor con un potencial de pares periódico en una red cuadrada, encontrado las bandas de energía y la densidad de estados. Se encuentran y analizan la aparición de nuevas brechas de energía, que no aparecen en sistemas homogéneos, las cuales pueden ser relevantes cerca de la temperatura crítica. Para sistemas basados en grafeno se estudian superredes de bloques $pn$ acopladas a un superconductor, encontrando que el número de nuevos puntos de Dirac no es afectado por la región superconductora, pero debido a las reflexiones de Andreev locales, se puede determinar su aparición e incrementar su intensidad, lo cual podría utilizarse para su detección. Adicionalmente se analizan los casos de bloques pn asimétricos en voltajes "gate, donde se demuestra que se puede recobrar el caso simétrico haciendo un cambio en el dopaje efectivo en la lámina de grafeno, mientras que cuando los anchos son asimétricos los nuevos puntos de Dirac pueden no crearse. Se analizan los mapas de probabilidad de transmisión electrón-electrón y electrón-hueco en sistemas de lentes de Veselago GSG y G-SL-S-SL-G, con G grafeno dopado tipo n, SL una superred y S un superconductor dopado tipo p. En estos sistemas los puntos focales pueden ser mejorados cambiando los parámetros del sistema, adicionalmente, con la introducción de las superredes se puede colimar la corriente de electrones y que la señal de enfoque de huecos sea mayoritaria. Con bicapas de grafeno se estudian las lentes de Veselago encontrando cómo los fenómenos de interferencia entre las dos monocapas afectan los mapas de probabilidad de transmisión electrón-electrón, creando diferencias respecto a los resultados con monocapas de grafeno. (Texto tomado de la fuente).In this work we analyze the effect of a periodic pair potential on the density of states and transport properties in unconventional superconductors. The effect of semi-infinite or finite periodic superlattices in heterostructures formed by graphene and superconductors is also studied. A two-dimensional superconductor with a periodic pair potential in a square lattice is analyzed, finding the energy bands and the density of states. The appearance of new energy gaps, which do not appear for homogeneous systems, and which may be relevant near the critical temperature, are found and analyzed. Block $ pn $ superlattices are studied for graphene-based systems coupled to a superconductor. Thus, the number of new Dirac points is not affected by the superconducting region; however, due to local Andreev reflections, its emergence can be determined, and its intensity increased, which could be used for its detection. In addition, the cases of asymmetric $ pn $ blocks at gate voltages are analyzed, where the symmetric case can be recovered by making a change in the effective doping in the graphene sheet, while no new Dirac points can be created when the widths are asymmetric. The electron-electron and electron-hole transmission probability maps are analyzed in Veselago $GSG$ and $ G-SL-S-SL-G $ lens systems, with $ G $ doped graphene type $ n $, $ SL $ a superlattice and $ S $ a $ p $-type doped superconductor. In these systems, the focal points can be improved by changing the system parameters. Additionally, with the introduction of the superlattice, the electron current can be collimated and the hole focusing signal can be increased. Veselago lenses with graphene bilayers are studied, showing that the interference between the two monolayers affects the electron-electron transmission probability maps, creating differences concerning the results with graphene monolayers.DoctoradoDoctor en Ciencias - FísicaEstado sólidoxv, 136 páginasapplication/pdfspaUniversidad Nacional de ColombiaBogotá - Ciencias - Doctorado en Ciencias - FísicaDepartamento de FísicaFacultad de CienciasBogotá, ColombiaUniversidad Nacional de Colombia - Sede Bogotá530 - FísicaSuperconductorsElectric conductivitySuperconductoresConductividad eléctricaFunciones de GreenSuperconductividadGrafenoBicapas de grafenoReflexiones de AndreevLentes de VeselagoGreen functionsSuperconductivityGrapheneBilayers grapheneAndreev reflectionVeselago lensCarbonoCarbonDensidad de estados y transporte eléctrico en superconductores y sistemas periódicos nanoestructuradosDensity of states and electric transport in superconductors and systems with periodic nanoestructureTrabajo de grado - Doctoradoinfo:eu-repo/semantics/doctoralThesisinfo:eu-repo/semantics/acceptedVersionhttp://purl.org/coar/resource_type/c_db06Texthttp://purl.org/redcol/resource_type/TD[1] J. 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Lett., vol. 107, p. 086801, 2011. https://link.aps.org/doi/10.1103/ PhysRevLett.107.086801Programa de becas doctorales de ColcienciasColcienciasPúblico generalLICENSElicense.txtlicense.txttext/plain; charset=utf-83964https://repositorio.unal.edu.co/bitstream/unal/80401/1/license.txtcccfe52f796b7c63423298c2d3365fc6MD51ORIGINAL80190330.2021.pdf80190330.2021.pdfTesis de Doctorado en Ciencias - Físicaapplication/pdf7923340https://repositorio.unal.edu.co/bitstream/unal/80401/2/80190330.2021.pdf7ed235ac95e0e0e475d9a6ac110093ebMD52THUMBNAIL80190330.2021.pdf.jpg80190330.2021.pdf.jpgGenerated Thumbnailimage/jpeg4713https://repositorio.unal.edu.co/bitstream/unal/80401/3/80190330.2021.pdf.jpgf3361d7d4f14fdecaf0b77526ff4f739MD53unal/80401oai:repositorio.unal.edu.co:unal/804012024-07-30 23:11:11.511Repositorio Institucional Universidad Nacional de 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