Speaker
Description
Resonances in quantum few-body systems are inherently unstable, decaying into continuum states of their constituent subsystems with a finite lifetime. In this talk, we present a mechanism by which three-body resonances can be stabilized into so-called bound states in the continuum (BICs), states embedded in the continuum spectrum that nevertheless exhibit vanishing decay width. Using a two-channel framework, we show that the lifetime can be made arbitrarily long through continuous tuning of system parameters. We illustrate the mechanism in two complementary examples: a mass-imbalanced one-dimensional system and a three-dimensional system of identical bosons in the Efimov regime. In the latter case, we demonstrate that a three-body BIC can be reached by tuning an external magnetic field, a standard experimental tool in cold-atom experiments.
| Theoretical or experimental | Theoretical |
|---|