Probing open- And closed-channel -wave resonances
| Autor: | Denise J. M. Ahmed-Braun, Servaas Kokkelmans, Joseph H. Thywissen, Ben A. Olsen, Scott Smale, Kenneth G. Jackson, Colin J. Dale, Paul S. Julienne |
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| Přispěvatelé: | Coherence and Quantum Technology, Center for Quantum Materials and Technology Eindhoven |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Physics
Shape resonance Atomic Physics (physics.atom-ph) Scattering Binding energy FOS: Physical sciences Resonance 01 natural sciences Physics - Atomic Physics 010305 fluids & plasmas symbols.namesake Amplitude Quantum Gases (cond-mat.quant-gas) 0103 physical sciences symbols van der Waals force Atomic physics Condensed Matter - Quantum Gases 010306 general physics Feshbach resonance Energy (signal processing) |
| Zdroj: | Physical Review Research, 3(3):033269. American Physical Society |
| ISSN: | 2643-1564 |
| Popis: | We study the near-threshold molecular and collisional physics of a strong $^{40}$K p-wave Feshbach resonance through a combination of measurements, numerical calculations, and modeling. Dimer spectroscopy employs both radio-frequency spin-flip association in the MHz band and resonant association in the kHz band. Systematic uncertainty in the measured binding energy is reduced by a model that includes both the Franck-Condon overlap amplitude and inhomogeneous broadening. Coupled-channels calculations based on mass-scaled $^{39}$K potentials compare well to the observed binding energies and also reveal a low-energy p-wave shape resonance in the open channel. Contrary to conventional expectation, we observe a nonlinear variation of the binding energy with magnetic field, and explain how this arises from the interplay of the closed-channel ramping state with the near-threshold shape resonance in the open channel. We develop an analytic two-channel model that includes both resonances as well as the dipole-dipole interactions which, we show, become important at low energy. Using this parameterization of the energy dependence of the scattering phase, we can classify the studied $^{40}$K resonance as broad. Throughout the paper, we compare to the well understood s-wave case, and discuss the significant role played by van der Waals physics. The resulting understanding of the dimer physics of p-wave resonances provides a solid foundation for future exploration of few- and many-body orbital physics. v4: new appendix |
| Databáze: | OpenAIRE |
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