Bulletin of the American Physical Society
46th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 60, Number 7
Monday–Friday, June 8–12, 2015; Columbus, Ohio
Session J8: Invited Session: Few-body Experiments and Theory |
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Sponsoring Units: GFB Chair: Chris Greene, Purdue Uniersity Room: Franklin CD |
Wednesday, June 10, 2015 2:00PM - 2:30PM |
J8.00001: Interfering and entangling single neutral atoms Invited Speaker: Cindy Regal Optical tweezers have become a powerful and versatile tool for quantum control of single neutral atoms. I will present two experiments that demonstrate these capabilities, which rely on the ability to control all spin, motional and spatial degrees of freedom of two single atoms. In the first experiment, we interfere two atoms on an atomic beamsplitter formed by a tunnel-coupled double-well potential. The interference is directly analogous to that observed with photons in the original Hong-Ou-Mandel experiment, and demonstrates the indistinguishability and quantum state purity reached for the independently prepared atoms. The second experiment focuses on the generation of non-local entanglement via local interactions. We utilize a spin-exchange effect mediated by the contact interaction between the atoms to create entanglement between motional and spin degrees of freedom, which we then convert to entanglement between spatial and spin degrees of freedom by separating the atoms and verifying the persistence of their two-particle coherence. [Preview Abstract] |
Wednesday, June 10, 2015 2:30PM - 3:00PM |
J8.00002: Efimov physics in an ultracold Bose-Fermi mixture with large mass imbalance Invited Speaker: Matthias Weidemueller An ultracold Bose-Fermi mixture of Cs and Li atoms constitutes a prototypical system with large mass imbalance that allows the exploration of many intriguing phenomena in few- and many-body physics. One of such is the heteronuclear Efimov effect, due to which an infinite geometrical series of bound three-body states can be formed, given that the two-body interactions are resonant. Here we present the recent observations of consecutive Efimov resonances through measurements of three-body loss coefficients near the broad Feshbach resonance.\footnote{R. Pires {\emph et al.}, PRL 112, 250404 (2014); PRA 90, 012710 (2014). See also: S.-K. Tung \emph{et al.}, PRL 113, 240402 (2014).} A refined analysis of the Feshbach resonance\footnote{J. Ulmanis {\emph et al.}, arXiv:1501.04799.} allows us to obtain an improved determination of the scaling of the Efimov resonances, which slightly deviates from the predicted universal scaling factor for the LiCs system. In a recent study, we have determined the effect of the Cs-Cs scattering length on the three-body parameter of the Efimov resonances. [Preview Abstract] |
Wednesday, June 10, 2015 3:00PM - 3:30PM |
J8.00003: Boson droplets without and with an impurity: The large two-body s-wave scattering length limit Invited Speaker: D. Blume Universal behavior in ultracold atomic systems emerges when the magnitude of the s-wave scattering length is much larger than the other length scales of the underlying two-body potentials. For example, in the large scattering length regime, three identical bosons at zero temperature exhibit the Efimov effect. This talk discusses extensions of the Efimov scenario to more than three particles. Two different systems are considered: First, the properties of N identical bosons interacting through finite- and zero-range two-body potentials are discussed. The dependence of the N-boson energy and structural properties on the interaction model and, where appropriate, the regularization scheme in the three-body sector is investigated. Second, motivated by recent experimental investigations of Cs-Cs-Li Efimov resonances, the few-body properties of N-1 non-interacting identical heavy bosons, which interact with a light impurity through a large s-wave scattering length, are investigated. For Cs-Cs-Cs-Li, the existence of two four-body states, which are universally linked to the energy of the n-th Cs-Cs-Li Efimov trimer, is predicted. [Preview Abstract] |
Wednesday, June 10, 2015 3:30PM - 4:00PM |
J8.00004: Universal bound states in confined geometries Invited Speaker: Meera Parish The dimensionality of a system can fundamentally impact the behavior of interacting quantum particles. As a general rule, particles are more likely to cluster and bind together when they are confined to a plane and their motion is restricted. However, attractively interacting bosons apparently defy this expectation: While three identical bosons in three dimensions can support an infinite tower of Efimov trimers, only two universal trimers exist in the two-dimensional case. In this talk, I will show how these two limits are connected by investigating the problem of three identical bosons confined by a harmonic potential along one direction. I find that the deepest bound Efimov trimer hybridizes with the two-dimensional trimers, yielding a superposition of trimer configurations that effectively involves tunneling through a short-range repulsive barrier. This suggest a way to use strong confinement to engineer more stable Efimov-like trimers, which have so far proved elusive. [Preview Abstract] |
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