2010/08/31 by S. Tölle, H. -W. Hammer, B. C. Metsch · 1 citation
Physics and Astronomy · #cond-mat.quant-gas #nucl-th
paper · pdf · doi:10.1016/j.crhy.2010.11.011
published as Comptes Rendus Physique 12:59-70,2011 · 20 pages, 10 figures, final version, new references added
arxiv created 2012/08/15 · arxiv updated 2012/08/16
Few-body systems with resonant short-range interactions display universal properties that do not depend on the details of their structure or their interactions at short distances. In the three-body system, these properties include the existence of a geometric spectrum of three-body Efimov states and a discrete scaling symmetry. Similar universal properties appear in 4-body and possibly higher-body systems as well. We set up an effective theory for few-body systems in a harmonic trap and study the modification of universal physics for 3- and 4-particle systems in external confinement. In particular, we focus on systems where the Efimov effect can occur and investigate the dependence of the 4-body spectrum on the experimental tuning parameters.