Ulmanis J. Heteronuclear Efimov Scenario in Ultracold Quantum Gases. Universality in Systems with Large Mass Imbalance

Springer International Publishing, 2017 — 125p. — (Springer Theses) — ISBN: 978-3-319-51862-6 (eBook), 978-3-319-51861-9 (Hardcover).This thesis represents a decisive breakthrough in our understanding of the physics of universal quantum-mechanical three-body systems.
The Efimov scenario is a prime example of how fundamental few-body physics features universally across seemingly disparate fields of modern quantum physics. Initially postulated for nuclear physics more than 40 years ago, the Efimov effect has now become a new research paradigm not only in ultracold atomic gases but also in molecular, biological and condensed matter systems. Despite a lot of effort since its first observations, the scaling behavior, which is a hallmark property and often referred to as the “holy grail” of Efimov physics, remained hidden until recently. In this work, the author demonstrates this behavior for the first time for a heteronuclear mixture of ultracold Li and Cs atoms, and pioneers the experimental understanding of microscopic, non-universal properties in such systems. Based on the application of Born-Oppenheimer approximation, well known from molecular physics textbooks, an exceptionally clear and intuitive picture of heteronuclear Efimov physics is revealed.Two-Body Interactions Between Li and Cs Atoms
Universality of Li-Cs-Cs Efimov Resonances
Finite-Range Effects in Li-Cs-Cs Efimov Resonances
Conclusion and Outlook