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A Study of Josephson Junction Characteristics.
KTH, School of Engineering Sciences (SCI), Theoretical Physics.
KTH, School of Engineering Sciences (SCI), Theoretical Physics.
2011 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

This Bachelor thesis has as its aim to investigate Josephson junctions by examining

their I-V characteristics and to visualize various phenomena associated with Josephson

junctions. Primarily, everything considered in this thesis uses a semi-classical model

where quantum eects have been excluded. The thesis focuses on 1D arrays of Josephson

junctions fed with direct current with the goal to study what occurs when many junctions

are placed in a row. First a single Josephson junction is simulated and we observe a

hysteresis in the I-V characteristics that is examined. Secondly a 1-D array is considered

and the coupled system of dierential equations that follows is solved numerically, and

from this data the properties of Josephson junctions are deduced. We discovered that this

array generally has similar properties to a single Josephson junction. We also sought to

replicate results obtained experimentally in the lab by David Haviland and his co-workers

at KTH, but by simulations, to see how good our models are. We have produced data

agreeing partly with the experimental results and we have had no directly contradicting

outcomes from our simulations. An explicit relation between the number of Josephson

junctions and the feature of the I-V characteristics was derived and the validity of our

model was strengthened by the consistency of our results.

Place, publisher, year, edition, pages
2011. , 29 p.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-103461OAI: oai:DiVA.org:kth-103461DiVA: diva2:560204
Uppsok
Technology
Available from: 2012-10-12 Created: 2012-10-12 Last updated: 2012-11-21Bibliographically approved

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