Transport and subgap states in superconducting heterostructures of effective Dirac systems
Seiten
2022
Universitätsverlag Regensburg
978-3-86845-171-9 (ISBN)
Universitätsverlag Regensburg
978-3-86845-171-9 (ISBN)
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In recent years, effective Dirac systems recieved a lot of attention in solid state physics. These are systems whose dispersion can effectively be described by a Dirac cone, the most prominent examples beeing graphene and topological insulators (TIs). These systems exhibit intriguing phenomena---for example, TIs can host perfectly transmitted modes or, in conjunction with superconductors, Majorana zero modes.
This thesis deals with superconducting heterostructures of both of the aforementioned materials and examines transport phenomena as well as the formation of subgap states in such systems: In the first chapter, superconducting bilayer graphene with a chemisorbed adatom is investigated and the existence of peculiar subgab states, so-called Yu-Shiba-Rusinov states, is shown. The second chapter deals with T junction devices make out of three-dimensional (3D) TI nanowires.Together with proximity induced superconductivity in one arm and external magnetic fields, this setup allows for the occurence of crossed Andreev reflection, including perfect crossed Andreev reflection, and negative nonlocal conductances. In the third chapter, Josephson junctions of 3D TI nanowires are investigated. The origin of unusual, experimentally observed supercurrent oscillations in dependence of a parallel magnetic field is examinated in a semiclassical analysis.
This thesis deals with superconducting heterostructures of both of the aforementioned materials and examines transport phenomena as well as the formation of subgap states in such systems: In the first chapter, superconducting bilayer graphene with a chemisorbed adatom is investigated and the existence of peculiar subgab states, so-called Yu-Shiba-Rusinov states, is shown. The second chapter deals with T junction devices make out of three-dimensional (3D) TI nanowires.Together with proximity induced superconductivity in one arm and external magnetic fields, this setup allows for the occurence of crossed Andreev reflection, including perfect crossed Andreev reflection, and negative nonlocal conductances. In the third chapter, Josephson junctions of 3D TI nanowires are investigated. The origin of unusual, experimentally observed supercurrent oscillations in dependence of a parallel magnetic field is examinated in a semiclassical analysis.
https://download.schnell-und-steiner.de/ihv/9783868451719_inhaltsverzeichnis.pdf
| Erscheinungsdatum | 01.03.2023 |
|---|---|
| Reihe/Serie | Dissertationsreihe Physik |
| Sprache | englisch |
| Maße | 170 x 240 mm |
| Themenwelt | Naturwissenschaften ► Physik / Astronomie ► Atom- / Kern- / Molekularphysik |
| Schlagworte | Doppelschicht-Graphene • Gebundene Andreev-Zustände • Josephson-Kontakte • Mesoskopische Physik • Supraleitende Heterostrukturen • topologische Isolatoren • Yu-Shiba-Rusinov Zustände |
| ISBN-10 | 3-86845-171-4 / 3868451714 |
| ISBN-13 | 978-3-86845-171-9 / 9783868451719 |
| Zustand | Neuware |
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