Jacob Fuchs

Transport and subgap states in superconducting heterostructures of effective Dirac systems

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.

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Reihe:
Bandnummer: 57

1. Auflage (2022), 144 Seiten, 17 x 24 cm, Klebebindung,

Erscheinungstermin: 20. Dezember 2022
ISBN: 978-3-86845-171-9

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.

  • In this thesis, T junctions out of topological insulators are investigated theoretically and the occurence of (perfect) crossed Andreev reflection is shown.
  • Furthermore, the physical origin of supercurrent oscillations of a 3D TI nanowire Josephson junction in dependence of a magentic field is discussed.

Jacob Fuchs

Reihe: (BR706)
Bandnummer: 57
Warengruppe: 1645
Sprache: Englisch
Auflage: 1 (2022)
Medium: Buch
Einbandart: Klebebindung
Seitenzahl: 144
Format: 17 x 24 cm
Erscheinungsdatum: 20. Dezember 2022
ISBN: 978-3-86845-171-9
Verlag: Universitätsverlag Regensburg
Cover: Cover download

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