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Universality in Three- and Four-Body Bound States of Ultracold Atoms
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Universality in Three- and Four-Body Bound States of Ultracold Atoms
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Journal Article
Universality in Three- and Four-Body Bound States of Ultracold Atoms
2009
Overview
Under certain circumstances, three or more interacting particles may form bound states. Although the general few-body problem is not analytically solvable, the so-called Efimov trimers appear for a system of three particles with resonant two-body interactions. The binding energies of these trimers are predicted to be universally connected to each other, independent of the microscopic details of the interaction. By exploiting a Feshbach resonance to widely tune the interactions between trapped ultracold lithium atoms, we find evidence for two universally connected Efimov trimers and their associated four-body bound states. A total of 11 precisely determined three- and four-body features are found in the inelastic-loss spectrum. Their relative locations on either side of the resonance agree well with universal theory, whereas a systematic deviation from universality is found when comparing features across the resonance.
Publisher
American Association for the Advancement of Science,The American Association for the Advancement of Science
Subject
