Bulletin of the American Physical Society
2013 Joint Meeting of the APS Division of Atomic, Molecular & Optical Physics and the CAP Division of Atomic, Molecular & Optical Physics, Canada
Volume 58, Number 6
Monday–Friday, June 3–7, 2013; Quebec City, Canada
Session N1: Dynamics of Ultracold Few-Atom Systems |
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Chair: Doerte Blume, Washington State University Room: 200A |
Thursday, June 6, 2013 10:30AM - 11:00AM |
N1.00001: Experimental studies of ultracold few-fermion systems Invited Speaker: Selim Jochim |
Thursday, June 6, 2013 11:00AM - 11:30AM |
N1.00002: Effective multibody interactions of confined ultracold bosons Invited Speaker: Philip Johnson Effective multibody interactions are central to quantum field theories, and play an important role in the dynamics of tightly confined few-body systems. For example, collapse-and-revival oscillations of quenched superfluids in optical lattices show strong signatures of effective three-body interactions. Their effects are also seen in precision measurements of Mott-insulator states of ultracold atoms, and recent studies suggest they can be used to generate exotic quantum phases. These applications require accurate calculations of effective two- and three-body interaction strengths; moreover, effective four-body interactions, which require working to at least third order in perturbation theory, may also yield important corrections and new physics. In this talk, I describe our recent analysis of effective two-, three-, and four-body interactions for confined ultracold bosons. Unexpectedly, comparisons between our numerical simulations and analytic results show that finite-range corrections to the boson-boson interaction potential must also be taken into account. Utilizing an energy-dependent pseudopotential and renormalized perturbation theory, we have constructed a simple yet accurate model of interacting ultracold bosons that captures the combined physics of multibody interactions and finite-range corrections through third order. [Preview Abstract] |
Thursday, June 6, 2013 11:30AM - 12:00PM |
N1.00003: Effect of Spin-Orbit Coupling to Interacting Ultracold Atoms Invited Speaker: Xiaoling Cui The recent realization of spin-orbit (SO) coupling in neutral atoms has opened up new directions to explore novel SO effects in a diversity of new physical settings. In this talk, I shall discuss two important effects of SO coupling to interacting ultracold atoms. First, the presence of SO coupling will inevitably induce mixed scatterings and interference between different partial-waves, and as a result it could significantly affect the validity of widely-used pseudo-potentials. Explicitly, the s-wave pseudo-potential alone is approximately valid under more stringent conditions, while the p-wave pseudo-potential alone can no longer be used even near p-wave resonance. These results indicate a fundamental change of short-range physics for interacting atoms in high orbits, due to destructive interference with lower ones. Second, the presence of SO coupling will induce exotic scattering between spin-1/2 bosons confined in a quasi-one-dimensional waveguide, and lead to a Tonks gas with unique properties that have not been unveiled before. Explicitly, SO coupling will break the magnetization conservation during the scattering process, and also induce a sequence of scattering resonances (or Tonks limit) simultaneously in all scattering channels. Unlike the usual Tonks gas of identical bosons, the Tonks gas here, with strong spin-orbit entanglement, exhibits rich textures in spin and density distributions. These features can be directly observed in current cold atom experiment. [Preview Abstract] |
Thursday, June 6, 2013 12:00PM - 12:30PM |
N1.00004: Few-body dynamics of dipolar and finite-range systems Invited Speaker: Chris Greene The physics of few-body universality has progressed recently in leaps and bounds. This talk will discuss some of the exciting recent theoretical developments as well as some of the experimental headway in this realm. One topic to be covered is the universal physics of 3 dipolar fermions and 3 dipolar bosons and their relationship to Efimov physics. Other recent headway relates to the universality of the 3-body parameter, again in the Efimov domain, for both homonuclear and heteronuclear systems with short-range interactions. Collaborators in various aspects of the research to be discussed include Jose D'Incao, Brett Esry, Jia Wang, and Yujun Wang. [Preview Abstract] |
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