Bulletin of the American Physical Society
41st Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 55, Number 5
Tuesday–Saturday, May 25–29, 2010; Houston, Texas
Session R2: Efimov Physics with Ultra-cold Atoms |
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Chair: Cheng Chin, University of Chicago Room: Imperial Center |
Friday, May 28, 2010 10:30AM - 11:00AM |
R2.00001: Efimov physics: what we can learn from cesium atoms Invited Speaker: Cesium is the first species that has revealed signatures of Efimov states and related few-body phenomena. I will first give an overview of the previous observations in this system for purely atomic samples, atom-dimer mixtures, and pure dimer samples, and discuss how all these observations fit together in the Efimov scenario with extensions to four-body systems. I will discuss open question on the interpretation of the results. I will then present our current experiments, which are dedicated to a comparison of Efimov features on different (broad) Feshbach resonances in the same atomic state and to the search for resonant dimer-dimer interactions. Work performed in collaboration with: M. Berninger, F. Ferlaino, W. Harm, J. P. D'Incao, S. Knoop, H.-C. N\"agerl, A. Zenesini. [Preview Abstract] |
Friday, May 28, 2010 11:00AM - 11:30AM |
R2.00002: Universality of few-body systems: Four-body and beyond Invited Speaker: Weakly-bound few-body systems have been studied extensively by the atomic, nuclear and condensed matter communities since the early days of quantum mechanics. Intriguingly, under certain circumstances these systems behave universal, i.e., their behavior is independent of the details of the underlying two-body interactions. Over the past few years, several experimental groups have reported observations of universal aspects of three- and four-body systems under controlled conditions, motivating further theoretical work. This talk summarizes our recent theoretical studies on universal few-particle systems consisting of four or more particles. We will discuss the energetics and structural properties of extremely weakly-bound few-boson systems consisting of four or more particles and discuss their connection to Efimov trimers. Furthermore, the universal properties of trapped equal-mass few-fermion systems will be illustrated. Lastly, a discussion of the universal behavior of two-component Fermi systems with unequal masses will be presented. [Preview Abstract] |
Friday, May 28, 2010 11:30AM - 12:00PM |
R2.00003: Efimov Physics in a Fermi Gas Invited Speaker: While Efimov's scenario is often described in the context of identical bosons, the Efimov effect also occurs for three distinguishable fermions provided that at least two of the three scattering lengths are large. I will describe experiments in which we observe the Efimov effect in a Fermi gas of 6Li atoms with equal populations in three different internal hyperfine states. In this system, the three scattering lengths can be tuned by three overlapping Feshbach resonances. We observe several resonantly enhanced three body loss features when either a ground or first excited Efimov trimer crosses the three atom scattering threshold. The variation in the three body recombination rate which spans eight orders of magnitude is well described by Efimov physics. We expect that the Efimov effect will play an important role in future studies of many body phenomena such as ``color'' superfluidity and quantum magnetism in this system. [Preview Abstract] |
Friday, May 28, 2010 12:00PM - 12:30PM |
R2.00004: Effective interaction of three bosons at low energy Invited Speaker: It is shown that the effective interaction strength of three bosons at small collision energies can be extracted from their wave function at zero energy. Asymptotic expansions of this wave function at large interparticle distances are derived, from which is defined a quantity $D$ named three-body scattering hypervolume, which is an analog of the two-body scattering length. Given any finite-range interactions, one can thus predict the effective three-body force from a numerical solution of the Schr\"odinger equation. In this way, the constant $D$ for hard-sphere bosons as well as that for bosons with large scattering length are computed (Efimov effect is present in the latter case). The ground state energy of three bosons in a low-frequency harmonic trap is computed, which depends on the constant $D$. [Preview Abstract] |
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