The Search For FFLO in a Quasi-One-Dimensional Ultracold Fermi Gas

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dc.contributor.advisorHulet, Randall G
dc.creatorFry, Jacob Alexander
dc.date.accessioned2022-09-23T21:53:10Z
dc.date.available2022-09-23T21:53:10Z
dc.date.created2022-05
dc.date.issued2022-04-20
dc.date.submittedMay 2022
dc.date.updated2022-09-23T21:53:10Z
dc.description.abstractThe Fulde-Ferrell Larkin-Ovchinnikov (FFLO) type superconductor is an exotic form of matter known as a supersolid because it simultaneously supports superfluid and magnetic order. In both condensed matter and ultracold atomic gases, this phase has yet to be conclusively observed despite long interest in both theory and experiment. In one-dimension (1D), unlike expectations for higher dimensions, the FFLO phase is found in a large region of the phase diagram [1]. The effect of quantum and thermal fluctuations, however, are expected to be reduced in higher dimensions. These considerations motivated the proposal to search for FFLO near the 1D-3D dimensional crossover [2], which we have identified and characterized [3]. We confine a spin-imbalanced Fermi gas of lithium 6 to an array of 1D tubes using a 2D optical lattice. We bring the system into the dimensional crossover by increasing the inter-tube tunneling rate and using a Feshbach resonance to tune interactions. The periodicity of these domain walls, which depends on the magnitude of the polarization, is a definitive signature of the FFLO phase. In this work, we develop new experimental and analytical methods to extract periodic signals that, if they indeed are domain walls, lay the foundation for full confirmation of the FFLO phase. [1] Y. A. Liao, A. S. C. Rittner, T. Paprotta, W. Li, G. B. Partridge, R. G. Hulet, S. K. Baur, and E. J. Mueller, “Spin-imbalance in a one-dimensional Fermi gas,” Nature 467, 567 (2010). [2] M. M. Parish, S. K. Baur, E. J. Mueller, and D. A. Huse, “Quasi-One- Dimensional Polarized Fermi Superfluids,” Phys. Rev. Lett. 99, 250403 (2007). [3] M. C. Revelle, J. A. Fry, B. A. Olsen, and R. G. Hulet, “1D to 3D Crossover of a Spin-Imbalanced Fermi Gas,” Physical Review Letters 117 (2016).
dc.format.mimetypeapplication/pdf
dc.identifier.citationFry, Jacob Alexander. "The Search For FFLO in a Quasi-One-Dimensional Ultracold Fermi Gas." (2022) Diss., Rice University. <a href="https://hdl.handle.net/1911/113349">https://hdl.handle.net/1911/113349</a>.
dc.identifier.urihttps://hdl.handle.net/1911/113349
dc.language.isoeng
dc.rightsCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.
dc.subjectUltracold
dc.subjectatomic
dc.subjectfermion
dc.subjectlithium
dc.subjectsuperfluidity
dc.subjectsuperconductivity
dc.subjectorder parameter
dc.subjectFFLO
dc.subjectlower dimension
dc.subjectquasi-1D
dc.subjectoptical lattice
dc.subjectFeshbach resonance
dc.subjectphase contrast imaging
dc.subjectFourier transform
dc.subjectspectral subtraction
dc.subjectincoherent averaging
dc.subjectcoherent averaging
dc.subjecteigenface
dc.subjecteigencleaning
dc.subjectimaging fringe
dc.subjectbinding energy
dc.subjectsuperconducting pairs
dc.subjectFulde–Ferrell–Larkin–Ovchinnikov
dc.subject
dc.titleThe Search For FFLO in a Quasi-One-Dimensional Ultracold Fermi Gas
dc.typeThesis
dc.type.materialText
thesis.degree.departmentPhysics
thesis.degree.disciplineNatural Sciences
thesis.degree.grantorRice University
thesis.degree.levelDoctoral
thesis.degree.nameDoctor of Philosophy
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