<> "The repository administrator has not yet configured an RDF license."^^ . <> . . "Quasiparticle formation and induced correlations in strongly coupled Bose-Fermi mixtures"^^ . "In this thesis, field theoretical and variational methods are applied to few- and\r\nmany-body problems of strongly interacting ultracold atomic gases and atomicallythin semiconductors. In strongly interacting mixtures of particles, the renormalizing\r\neffect of one species upon another is investigated to study the competition between\r\nthe formation of different quasiparticles and the associated quantum phases related\r\nto the appearance of such particles. Tracing back to the Fermi polaron problem in\r\nwhich an impurity interacts attractively with a bath of fermionic particles, a majority\r\nof the work presented in this thesis may be understood in the context of a transition\r\nbetween the molecule state, in which a bath particle binds tightly to the impurity,\r\nand a quasiparticle best described as an impurity dressed by a cloud of bath particles. Going from a few to many impurities, due to the small energy gap between\r\nthese quasiparticles, insights obtained in the Fermi polaron problem are leveraged\r\nto study the phase diagram of Fermi-Fermi and Bose-Fermi mixtures. First, the\r\nphase diagram of two- and three-dimensional Bose-Fermi mixtures is studied using\r\nthe functional renormalization group (fRG). Three-body correlations are considered,\r\nand the approach is suited to treat finite-density populations of both bosons and\r\nfermions to study the molecular phase. Concurrently, experimental data are analyzed\r\nto characterize the superfluid-to-normal transition encountered in three-dimensional\r\nBose-Fermi mixtures. A self-consistent, frequency- and momentum-resolved fRG approach is used to predict the transition point. This fRG method is then improved\r\nleveraging its analytical structure to obtain Greens functions at arbitrary complex\r\nfrequencies using exact analytical continuation at a reduced computational cost. This\r\nis used to study the momentum-dependent decay rates of low-lying excited states, and\r\npredictions for Ramsey and Raman measurements are made. A stochastic variational\r\napproach is used to study bound-state formation in few-body problems. Precursors of\r\nthe physics of the Fermi polaron problem are observed, and we find that finite interaction ranges, along with confinement, can greatly enhance trimer formation, relating to\r\nsuperfluid p-wave pairing. Finally, insights obtained in the study of strongly coupled\r\nBose-Fermi mixtures are leveraged to study superconductivity in two-dimensional heterostructures of transition metal dichalcogenides. Here, capturing the strong-coupling\r\nphysics of Bose-Fermi mixtures, boson-induced correlations are studied as a means to\r\ninduce/enhance superfluid pairing with high critical temperatures."^^ . "2024" . . . . . . . "Jonas von"^^ . "Milczewski"^^ . "Jonas von Milczewski"^^ . . . . . . "Quasiparticle formation and induced correlations in strongly coupled Bose-Fermi mixtures (PDF)"^^ . . . "Thesis_for_print.pdf"^^ . . . "Quasiparticle formation and induced correlations in strongly coupled Bose-Fermi mixtures (Other)"^^ . . . . . . "indexcodes.txt"^^ . . . "Quasiparticle formation and induced correlations in strongly coupled Bose-Fermi mixtures (Other)"^^ . . . . . . "lightbox.jpg"^^ . . . "Quasiparticle formation and induced correlations in strongly coupled Bose-Fermi mixtures (Other)"^^ . . . . . . "preview.jpg"^^ . . . "Quasiparticle formation and induced correlations in strongly coupled Bose-Fermi mixtures (Other)"^^ . . . . . . "medium.jpg"^^ . . . "Quasiparticle formation and induced correlations in strongly coupled Bose-Fermi mixtures (Other)"^^ . . . . . . "small.jpg"^^ . . "HTML Summary of #34437 \n\nQuasiparticle formation and induced correlations in strongly coupled Bose-Fermi mixtures\n\n" . "text/html" . .