Experiments with Feshbach molecules in a Bose-Fermi mixture

<p>In this thesis, I present studies of the creation of ultracold heteronuclear molecules from a dilute gas mixture of 87Rb and 40K. Using a Fano-Feshbach resonance, atom pairs are associated into molecules via time-dependent magnetic fields. Slow magnetic-field sweeps are used to make large samples of highly vibrationally excited KRb molecules, while rapid magnetic-field pulses are used to create quantum superpositions of atom and molecule states. Rabi- and Ramsey-type experiments demonstrate coherent oscillations between atoms and molecules. This new type of quantum superposition involves particles of different statistics (i.e., bosons and fermions) and demonstrates atom-molecule coherence without a Bose-Einstein condensate (BEC). These atom-molecule oscillations may provide a unique way to probe the many-body behavior of a strongly interacting Bose-Fermi mixture.</p>
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University of Colorado Boulder
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