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Supercurrents in a Topological Josephson Junction with a Magnetic Quantum Dot
Linnaeus University, Faculty of Technology, Department of Physics and Electrical Engineering.
2018 (English)Independent thesis Advanced level (degree of Master (Two Years)), 40 credits / 60 HE creditsStudent thesis
Abstract [en]

The purpose of this master thesis is to investigate theoretically the influence of a nanomagnet on the Josephson effect displayed by phase biased point contacts consisting of topological superconductors. The device is modeled using the nonequilibrium Keldysh Green’s function technique. First, the Gor’kov Green’s functions are calculated. From these Green’s functions, the quasi-classical ones, relevant for energies around the Fermi energy, are obtained. Transport properties such as charge currents are calculated and analyzed in terms of the junction’s density of states displaying Andreev and Majorana states. The combination of the nanomagnet coupling and the spin-momentum locking of the topological superconductors generates a magneto-electric effect causing the supercurrent to depend strongly on the nanomagnet’s direction.

Place, publisher, year, edition, pages
2018. , p. 108
Keywords [en]
Majorana, Andreev, Keldysh, Josephson, density of states, quantum transport, topological superconductor, magnet
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:lnu:diva-79327OAI: oai:DiVA.org:lnu-79327DiVA, id: diva2:1274078
Educational program
Physics, masterprogramme, 120 credits
Supervisors
Examiners
Available from: 2018-12-29 Created: 2018-12-27 Last updated: 2018-12-29Bibliographically approved

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Supercurrents in a Topological Josephson Junction with a Magnetic Quantum Dot(14304 kB)54 downloads
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Department of Physics and Electrical Engineering
Condensed Matter Physics

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CiteExportLink to record
Permanent link

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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
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