DC ElementWertSprache
dc.contributor.advisorMoritz, Henning-
dc.contributor.authorMozdzen, Alexandra-
dc.date.accessioned2024-09-17T07:31:52Z-
dc.date.available2024-09-17T07:31:52Z-
dc.date.issued2024-
dc.identifier.urihttps://ediss.sub.uni-hamburg.de/handle/ediss/11141-
dc.description.abstractThis thesis describes the experimental realisation of versatile and highly controllable quantum systems with ultracold quantum gases with the aim to study quantum many-body physics. In the first part we present the implementation of mesoscopic Fermi-Hubbard-type systems with potassium-40 in a bottom-up approach employing optical tweezers. The experimental setup features an in-vacuo microscope objective with a numerical aperture of 0.75 enabling high-resolution imaging, and allows for tunable interaction strengths via Feshbach resonances as well as for rapid repetition rates due to all-optical cooling schemes. However, reaching quantum degeneracy via Raman-sideband cooling turned out to be very challenging. The achieved 3D ground state fractions of ∼40% is not sufficient to make the study of quantum physics in the Hubbard model feasible. In the main part of the thesis we discuss how the experimental setup was re-designed and re-built in order to create two-dimensional bosonic bulk systems with potassium-39. The key feature is the rare combination of highly tunable interaction strengths via a variety of intra- as well as interstate Feshbach resonances with the ability to study spin mixtures with high-resolution imaging. We have been able to realise a three-dimensional quasi-pure Bose-Einstein condensate of ∼5 · 10^3 atoms. The sample is then brought into the quasi-two-dimensional regime by first pre-shaping it with a light sheet-like trap and then transferring it into a single layer of a blue-detuned optical lattice. As a result a degenerate two-dimensional Bose gas of ∼3 · 10^3 atoms with a temperature of ∼50nK corresponding to ∼0.2 T_{BKT} is created, where T_{BKT} is the BKT critical temperature. Finally, we discuss how 2D quantum droplets might be realised with the setup.en
dc.language.isoende_DE
dc.publisherStaats- und Universitätsbibliothek Hamburg Carl von Ossietzkyde
dc.rightshttp://purl.org/coar/access_right/c_abf2de_DE
dc.subject.ddc530: Physikde_DE
dc.titleCreating degenerate two-dimensional Bose gases with tunable interaction strengthen
dc.typedoctoralThesisen
dcterms.dateAccepted2024-09-04-
dc.rights.cchttps://creativecommons.org/licenses/by/4.0/de_DE
dc.rights.rshttp://rightsstatements.org/vocab/InC/1.0/-
dc.subject.bcl33.23: Quantenphysikde_DE
dc.type.casraiDissertation-
dc.type.dinidoctoralThesis-
dc.type.driverdoctoralThesis-
dc.type.statusinfo:eu-repo/semantics/publishedVersionde_DE
dc.type.thesisdoctoralThesisde_DE
tuhh.type.opusDissertation-
thesis.grantor.departmentPhysikde_DE
thesis.grantor.placeHamburg-
thesis.grantor.universityOrInstitutionUniversität Hamburgde_DE
dcterms.DCMITypeText-
dc.identifier.urnurn:nbn:de:gbv:18-ediss-121029-
item.creatorOrcidMozdzen, Alexandra-
item.creatorGNDMozdzen, Alexandra-
item.grantfulltextopen-
item.fulltextWith Fulltext-
item.advisorGNDMoritz, Henning-
item.languageiso639-1other-
Enthalten in den Sammlungen:Elektronische Dissertationen und Habilitationen
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