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

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dc.contributor.advisorHulet, Randall Gen_US
dc.creatorFry, Jacob Alexanderen_US
dc.date.accessioned2022-09-23T21:53:10Zen_US
dc.date.available2022-09-23T21:53:10Zen_US
dc.date.created2022-05en_US
dc.date.issued2022-04-20en_US
dc.date.submittedMay 2022en_US
dc.date.updated2022-09-23T21:53:10Zen_US
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).en_US
dc.format.mimetypeapplication/pdfen_US
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>.en_US
dc.identifier.urihttps://hdl.handle.net/1911/113349en_US
dc.language.isoengen_US
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.en_US
dc.subjectUltracolden_US
dc.subjectatomicen_US
dc.subjectfermionen_US
dc.subjectlithiumen_US
dc.subjectsuperfluidityen_US
dc.subjectsuperconductivityen_US
dc.subjectorder parameteren_US
dc.subjectFFLOen_US
dc.subjectlower dimensionen_US
dc.subjectquasi-1Den_US
dc.subjectoptical latticeen_US
dc.subjectFeshbach resonanceen_US
dc.subjectphase contrast imagingen_US
dc.subjectFourier transformen_US
dc.subjectspectral subtractionen_US
dc.subjectincoherent averagingen_US
dc.subjectcoherent averagingen_US
dc.subjecteigenfaceen_US
dc.subjecteigencleaningen_US
dc.subjectimaging fringeen_US
dc.subjectbinding energyen_US
dc.subjectsuperconducting pairsen_US
dc.subjectFulde–Ferrell–Larkin–Ovchinnikoven_US
dc.subjecten_US
dc.titleThe Search For FFLO in a Quasi-One-Dimensional Ultracold Fermi Gasen_US
dc.typeThesisen_US
dc.type.materialTexten_US
thesis.degree.departmentPhysicsen_US
thesis.degree.disciplineNatural Sciencesen_US
thesis.degree.grantorRice Universityen_US
thesis.degree.levelDoctoralen_US
thesis.degree.nameDoctor of Philosophyen_US
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