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dc.contributor.advisorBlakie, Blair
dc.contributor.advisorBradley, Ashton
dc.contributor.authorWilliamson, Lewis Alexander
dc.date.available2017-11-09T01:14:40Z
dc.date.copyright2017
dc.identifier.citationWilliamson, L. A. (2017). Phase ordering dynamics in a ferromagnetic spin-1 Bose-Einstein condensate (Thesis, Doctor of Philosophy). University of Otago. Retrieved from http://hdl.handle.net/10523/7718en
dc.identifier.urihttp://hdl.handle.net/10523/7718
dc.description.abstractSpinor Bose-Einstein condensates exhibit both superfluid and magnetic order, and accommodate phases with rich symmetry properties and topological defects. Transitions between these phases can be induced by tuning external fields. In this thesis we explore the dynamics of order formation in a quasi-2D spin-1 ferromagnetic condensate following a quench from an unmagnetised phase to one of three ferromagnetic phases. The ferromagnetic phases exhibit distinct symmetry properties (easy-plane, easy-axis or isotropic) and support distinct topological defects. In each phase we observe scale invariant ordering and identify the relevant topological defect affecting the order parameter growth. We find that each phase is characterised by a distinct dynamic critical exponent. In the easy-plane phase we identify a persistent turbulent cascade that affects spin ordering long after all topological defects have annihilated. In addition to our exploration of phase ordering dynamics, we study a microscopic model of spin vortex dynamics in the easy-plane phase. Our work provides a comprehensive theoretical study of phase ordering in a conservative system, provides a thorough foundation for studies of phase ordering in antiferromagnetic and higher spin condensates, and offers prospects for further research into fundamental questions regarding the ordering properties of spin systems. Our work is pertinent to current experiments, which have explored the initial stages of phase ordering in both ferromagnetic and antiferromagnetic spin-1 condensates.
dc.format.mimetypeapplication/pdf
dc.language.isoen
dc.publisherUniversity of Otago
dc.rightsAll items in OUR Archive are provided for private study and research purposes and are protected by copyright with all rights reserved unless otherwise indicated.
dc.subjectBose-Einstein
dc.subjectcondensate
dc.subjectspinor
dc.subjectcoarsening
dc.subjectphase
dc.subjectordering
dc.subjectdynamics
dc.subjectthermalisation
dc.subjectvortices
dc.subjectturbulence
dc.titlePhase ordering dynamics in a ferromagnetic spin-1 Bose-Einstein condensate
dc.typeThesis
dc.date.updated2017-11-09T00:07:34Z
dc.language.rfc3066en
thesis.degree.disciplinePhysics
thesis.degree.nameDoctor of Philosophy
thesis.degree.grantorUniversity of Otago
thesis.degree.levelDoctoral
otago.openaccessOpen
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