Cesium Bose-Einstein condensates in confined geometriesMežnaršič, Tadej (Avtor) Jeglič, Peter (Mentor) Žitko, Rok (Komentor) Bose-Einstein condensatesolitonsoliton trainGross-Pitaevskii equationmatter-wave jetsBose fireworkssub-Poissonian correlationsI present the first cold atom setup in Slovenia capable of producing a Bose-Einstein condenstate (BEC) of cesium. This thesis describes the experimental apparatus, the path to the BEC and two experiments in a quasi-one-dimensional trapping geometry. In the first experiment we investigated the formation of solitary matter-waves (solitons), which maintain their shape indefinitely inside the confining channel potential. This is the first experimental realization of solitons with cesium atoms. In addition to single solitons, soliton trains are formed inside the potential and train like structures outside the confining channel. Along with experiments the theory of solitons in the framework of Gross-Pitaevskii equation (GPE) is presented. In the second experiment we used the solitons as a source of matter-wave jets, which form when the condensate is subjected to periodic modulation of interatomic interaction. The jets are characterized with respect to the modulation amplitude and frequency as well as its duration. Conditions for the formation of jets in different velocity modes are explored with numerical simulations of GPE, resulting in a phase diagram for jet formation. The relatively rare incommensurate jets are confirmed experimentally. Finally, we show that jet number correlations are sub-Poissonian, indicating the possibility of quantum entanglement between the jets.20222022-03-26 08:15:01Doktorsko delo/naloga135693sl