Phase protection of Fano-Feshbach resonances
| Autor: | Christiane P. Koch, Natan Bibelnik, John W. Rosenberg, Daniel M. Reich, Prerna Paliwal, Yuval Shagam, Edvardas Narevicius, Oded Heber, Alexander Blech, Wojciech Skomorowski, Nicolas Hölsch |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Atomic Physics (physics.atom-ph)
Science FOS: Physical sciences General Physics and Astronomy Imaging techniques 02 engineering and technology Quantum mechanics 01 natural sciences Article General Biochemistry Genetics and Molecular Biology Physics - Atomic Physics Quantum state 0103 physical sciences Bound state Polariton Quantum system lcsh:Science Quantum Condensed Matter::Quantum Gases Physics Quantum Physics Multidisciplinary 500 Naturwissenschaften und Mathematik::530 Physik::539 Moderne Physik 010304 chemical physics Excited states General Chemistry 021001 nanoscience & nanotechnology Orders of magnitude (time) Excited state Atomic and molecular collision processes Quasiparticle lcsh:Q Atomic physics Quantum Physics (quant-ph) 0210 nano-technology |
| Zdroj: | Nature Communications Nature Communications, Vol 11, Iss 1, Pp 1-7 (2020) Nature Communications, 11 (1) |
| ISSN: | 2041-1723 |
| Popis: | Decay of bound states due to coupling with free particle states is a general phenomenon occurring at energy scales from MeV in nuclear physics to peV in ultracold atomic gases. Such a coupling gives rise to Fano-Feshbach resonances (FFR) that have become key to understanding and controlling interactions—in ultracold atomic gases, but also between quasiparticles, such as microcavity polaritons. Their energy positions were shown to follow quantum chaotic statistics. In contrast, their lifetimes have so far escaped a similarly comprehensive understanding. Here, we show that bound states, despite being resonantly coupled to a scattering state, become protected from decay whenever the relative phase is a multiple of π. We observe this phenomenon by measuring lifetimes spanning four orders of magnitude for FFR of spin–orbit excited molecular ions with merged beam and electrostatic trap experiments. Our results provide a blueprint for identifying naturally long-lived states in a decaying quantum system. Nature Communications, 11 (1) ISSN:2041-1723 |
| Databáze: | OpenAIRE |
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