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dc.contributor.advisorTanatar, Bilalen_US
dc.contributor.authorAkatürk, Emreen_US
dc.date.accessioned2019-08-09T10:04:11Z
dc.date.available2019-08-09T10:04:11Z
dc.date.copyright2019-07
dc.date.issued2019-07
dc.date.submitted2019-07-25
dc.identifier.urihttp://hdl.handle.net/11693/52330
dc.descriptionCataloged from PDF version of article.en_US
dc.descriptionThesis (Ph.D.): Bilkent University, Department of Physics, İhsan Doğramacı Bilkent University, 2019.en_US
dc.descriptionIncludes bibliographical references (leaves 49-59).en_US
dc.description.abstractHere, we present our work and findings on ultracold atomic systems. We first present a semi-analytical work on density wave instability (DWI) and collective modes of a bilayer dipolar system of bosons and fermions. We then show our results for quantum Monte Carlo (QMC) simulations on a bosonic system with an impurity in two-dimensions (2D). We investigate DWI on two parallel layers with antiparallel dipoles that have little to no pairing between interlayer particles. We observe that for both fermionic and bosonic bilayers, below a threshold intralayer coupling strength, no density wave instability emerges. At higher couplings, DWI forms below a critical layer spacing. We also investigate collective modes in this system. For the second problem, we present our investigations of a 2D Bose polaron, which is a system with bosonic particles and a mobile impurity. We use diffusion Monte Carlo (DMC) simulations to calculate physical quantities such as polaron energy and effective mass of the polaron as well as quantities that give insight to structural properties of the system such as pair correlation function and density profile. We model the boson-boson and boson-impurity interaction with hard spheres.en_US
dc.description.statementofresponsibilityby Emre Akatürken_US
dc.format.extentx, 59 leaves : charts ; 30 cm.en_US
dc.language.isoEnglishen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectAntiparallel dipolar bilayersen_US
dc.subjectDensity-wave instabilityen_US
dc.subjectCollective modesen_US
dc.subjectBose polaronen_US
dc.subjectImpurity-boson interactionsen_US
dc.subjectTwo-dimensionsen_US
dc.titleQuantum Monte Carlo simulations of ultracold atomic systemsen_US
dc.title.alternativeAşırı soğuk atomik sistemlerin Kuvantum Monte Carlo simulasyonlarıen_US
dc.typeThesisen_US
dc.departmentDepartment of Physicsen_US
dc.publisherBilkent Universityen_US
dc.description.degreePh.D.en_US
dc.identifier.itemidB160104


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