Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 52 for “"Feshbach"”.
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General theory of nuclear scattering : the Feshbach-Kerman-Koonin approach
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1995.
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BEC-BCS crossover with Feshbach resonance for three-hyperfine-species model
… and experimentally largely thanks to Feshbach resonances which allow us to tune the effective interaction between alkali atoms. In a Feshbach resonance, the effective s-wave scattering length grows when one moves toward the resonance point, and eventually diverges at this point. There …
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Herman Feshbach : what it meant to be a physicist in the twentieth century
… is a biographical snapshot of physicist Herman Feshbach (1917-2000). Herman Feshbach was a nuclear physics that spent over three-quarters of his life at the Massachusetts Institute of Technology. His life is a window through which I analyze the changes experienced by the physics community …
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Few- and Many-body Physics with Strongly Interacting Bose Gases
… interactions in the vicinity of scattering (Feshbach) resonances, and our experiments probe both equilibrium physics and post-quench dynamics. The thesis explores three main topics, focusing in turn on two-, three- and many-body physics. In the first set of experiments, we study the two-body …
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Experiments with interacting Bose and Fermi gases
… in the discovery of three interspecies 6Li-23Na Feshbach resonances, which opens up the possibility to study strongly interacting Bose-Fermi mixtures in this system. This investigations also led to the observation of other Feshbach resonances in 6Li and 23Na. Third, the properties of strongly …
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Dimers, Trimers and their Superpositions in a Bose-Fermi Mixture
… one heavier K atom, alongside the familiar NaK Feshbach dimer, using radiofrequency (rf) spectroscopy. We find that in proximity to a Feshbach resonance, the trimer feature closely follows the dimer resonance across an order-of-magnitude variation in binding energy. We show that the measured …
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Strongly interacting quantum mixtures of ultracold atoms
… -40K -41K. In particular, a broad interspecies Feshbach resonance between 40K -41K is observed, opening a new pathway to study a strongly interacting isotopic Bose-Fermi mixture of 40K -41K. Secondly, a new Bose-Fermi mixture of 23Na -40K is introduced. We show that 23Na is a very efficient …
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An ultracold gas of dipolar fermionic ²³Na⁴⁰K molecules
… of ²³Na and ⁴⁰K, and a systematic study of Feshbach resonances between the two atomic species. The study reveals more than 20 resonances in the s- and p-wave collision channels, and many of the s-wave resonances are exceptionally broad. Using two distinct s-wave resonances, we create loosely …
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LiNaK : multi-species apparatus for the study of ultracold quantum degenerate mixtures
… gas is reported. In addition, interspecies Feshbach resonances between ⁴¹K-⁴⁰K and ⁶Li-⁴¹K are observed, opening the way to the study of a strongly interacting isotopic Bose-Fermi mixture of ⁴¹K-⁴⁰K, which have similar mass. Thirdly, the creation of a quantum degenerate Bose-Fermi mixture of …
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Quantum Controlled Collisions and Magnetic Trapping of Ultracold NaLi Molecules
… The first two experiments are on molecular Feshbach resonances: in spin-polarized ²³Na⁶Li+²³Na collisions and in ²³Na⁶Li+²³Na⁶Li collisions. The first experiment focuses on the spectroscopic study of Feshbach resonances in two possible spin-polarized ²³Na⁶Li+²³Na collisions from near 0 to …
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Dynamical pairing states in cold gases
… dynamics can be explored in cold Fermi gas at a Feshbach resonance, a system with magnetically tunable interaction. Motivated by recent experiments, in Chapters 2 and 3 we study the pairing of fermions when a sudden switch of interaction induces the Bardeen-Cooper-Schrieffer (BCS) instability of …
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High-temperature superfluidity in an ultracold Fermi gas
… regime. The strong interactions are induced by a Feshbach scattering resonance that allows to tune the interfermion scattering length via an external magnetic field. When a Fermi mixture was cooled on the molecular side of such a Feshbach resonance, Bose-Einstein condensation of up to 107 …
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Quantum Computation and Simulation using Fermion Pair Registers
… by adjusting the fermion hopping as well as the Feshbach interaction between two fermions. These gates, together with previously demonstrated single-qubit rotations, form a universal gate set. Furthermore, by modulating the strength of the Feshbach interaction, one can realize 2D quantum Ising …
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Ultracold ²³Na⁶Li molecules in the triplet ground state
… we use magneto-association to form weakly bound Feshbach molecules. The Feshbach molecules are then transfered to the ro-vibrational triplet ground state using a two-photon stimulated Raman adiabatic passage (STIRAP) technique, forming 3 x 10⁴ molecules at a density of 5 x 10¹⁰ cm⁻³ and …
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Reactive Scattering of an Atom by a Diatom: The Coupled Arrangement Wavefunction Method
… of up to three functions. These results find a Feshbach resonance below the first excitation threshold, in agreement with experiments and previous calculations.
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Realization of Bose-Einstein condensation with Lithium-7 atoms
… the interaction between atoms in a BEC using the Feshbach resonance with a magnetic bias field of up to ~~ 1000G.
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Atoms and Molecules Immersed in a Bose-Einstein Condensate
… a ²³Na Bose-Einstein condensate. In contrast to Feshbach molecules, Bose polarons at negative scattering length are long-lived in the presence of the BEC. We demonstrate direct photoassociation from Bose polarons to electron- ically excited molecular states, dark resonance spectroscopy of the …
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Simultaneous cooling and trapping of 6Li and 85/87Rb
… the experimental setup needed for the study of Feshbach resonances between 85/87Rb and 6Li and the photoassociative formation of molecules.
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Studies of neutron inelastic scattering in crystal and liquid scintillators
… cross sections calculated using a Hauser-Feshbach model of Auerbach and Moore. Experimental data were; found to be in reasonable agreement with the calculated cross sections based on neutron transmission coefficients given by Auerbach and Perey.
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