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dc.contributor.authorDekker, Tina Elayne
dc.date.accessioned2019-04-23 20:10:09 (GMT)
dc.date.issued2019-04-23
dc.date.submitted2019-04-22
dc.identifier.urihttp://hdl.handle.net/10012/14558
dc.description.abstract2H-NbSe2 is a superconducting transition metal dichalcogenide that retains its superconductivity in its two-dimensional (2D) form. Owing to strong spin orbit coupling, 2D 2H-NbSe2 demonstrates unconventional superconductivity that allows both spin-singlet and spin-triplet Cooper pairing. There is experimental and theoretical evidence that 2D 2H-NbSe2 is an Ising superconductor. However, a direct measurement of its Ising nature has not yet been proven. In this thesis, I present the results of measurements on a 2H-NbSe2 superconducting spin filter tunnel junction fabricated with mechanically exfoliated 2D flakes. Using this device geometry, it may be possible to elucidate the pairing nature in 2H-NbSe2. Intense ultrashort laser pulses can photo-excite non-equilibrium states in materials leading to transient new phases and exotic states. In bulk materials these photo-excited states are short-lived. 1T′-MoTe2 in bulk form undergoes a reversible transition at ~250 K from the monoclinic phase (1T′-MoTe2) to the inversion-symmetry breaking, orthorhombic phase (Td-MoTe2). Td-MoTe2 is a candidate type II Weyl semimetal that is predicted to demonstrate exotic quantum phenomena. These phases in 2D MoTe2 flakes are characterized using ultrafast optical-pump probe techniques. The results indicate a permanent photo-induced structural change occurs in thin Td-MoTe2 at high fluences. Given the durability of this structural change, further characterization of the sample is achieved using magnetotransport measurements.en
dc.language.isoenen
dc.publisherUniversity of Waterlooen
dc.titleProbing Ising Superconductivity and Light-Induced Phase Transitions in Two-Dimensional Transition Metal Dichalcogenidesen
dc.typeMaster Thesisen
dc.pendingfalse
uws-etd.degree.departmentElectrical and Computer Engineeringen
uws-etd.degree.disciplineElectrical and Computer Engineering (Nanotechnology)en
uws-etd.degree.grantorUniversity of Waterlooen
uws-etd.degreeMaster of Applied Scienceen
uws-etd.embargo.terms4 monthsen
uws.contributor.advisorTsen, Adam Wei
uws.contributor.advisorKim, Na Young
uws.contributor.affiliation1Faculty of Engineeringen
uws.published.cityWaterlooen
uws.published.countryCanadaen
uws.published.provinceOntarioen
uws-etd.embargo2019-08-21T20:10:09Z
uws.typeOfResourceTexten
uws.peerReviewStatusUnrevieweden
uws.scholarLevelGraduateen


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