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RMIT University

1. Wilkinson, S. Quasicharge models of Josephson junction arrays.

Degree: 2019, RMIT University

Josephson junction arrays (JJAs) are engineered many-body quantum systems consisting of several superconducting islands connected by thin tunnel barriers - Josephson junctions (JJs). They are of interest both from a fundamental point of view (e.g. addressing questions of macroscopic quantum physics, providing model systems in which to study complex many-body phenomena) and from the prospect of technological applications (e.g. quantum computing, metrology, metamaterials). In this thesis we present various tools and techniques for the theoretical study of JJAs, and then put these tools to use in the modelling of two particular experiments on JJAs. In our presentation of the physics of JJAs, we emphasise phenomena unique to arrays (i.e. not seen in single junction devices such as qubits). We investigate charge transport through the the bilinear array, consisting of two linear chains of JJs, and show that it exhibits both Coulomb drag and depinning. We predict new phenomena arising from the interplay between Coulomb drag and depinning at voltages higher than have so far been experimentally reported. We then turn our attention to recent experiments in which planar JJAs were placed in 3-D microwave cavities, with vortices being injected via an externally applied magnetic eld. We calculate the impedance spectrum using linear response theory, which enables us to see when new vortices enter the system in the form of sharp changes in the resonance frequency.

Subjects/Keywords: Fields of Research; superconductivity; Josephson junction; quantum physics; mesoscopic physics; condensed matter physics; quantum engineering; Mathieu'; s equation; phase transitions; linear response theory; circuit theory

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Wilkinson, S. (2019). Quasicharge models of Josephson junction arrays. (Thesis). RMIT University. Retrieved from http://researchbank.rmit.edu.au/view/rmit:162703

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Wilkinson, S. “Quasicharge models of Josephson junction arrays.” 2019. Thesis, RMIT University. Accessed December 15, 2019. http://researchbank.rmit.edu.au/view/rmit:162703.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Wilkinson, S. “Quasicharge models of Josephson junction arrays.” 2019. Web. 15 Dec 2019.

Vancouver:

Wilkinson S. Quasicharge models of Josephson junction arrays. [Internet] [Thesis]. RMIT University; 2019. [cited 2019 Dec 15]. Available from: http://researchbank.rmit.edu.au/view/rmit:162703.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Wilkinson S. Quasicharge models of Josephson junction arrays. [Thesis]. RMIT University; 2019. Available from: http://researchbank.rmit.edu.au/view/rmit:162703

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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