Observation of a Halo Trimer in an Ultracold Bose-Fermi Mixture
arXiv:2411.04820 · doi:10.1103/flty-9d72
Abstract
The quantum mechanics of three interacting particles gives rise to interesting universal phenomena, such as the staircase of Efimov trimers predicted in the context of nuclear physics and observed in ultracold gases. Here, we observe a novel type of halo trimer using radiofrequency spectroscopy in an ultracold mixture of Na and K atoms. The trimers consist of two light bosons and one heavy fermion, and have the structure of a Feshbach dimer weakly bound to one additional boson. We find that the trimer peak closely follows the dimer resonance over the entire range of explored interaction strengths across an order of magnitude variation of the dimer energy, as reproduced by our theoretical analysis. The presence of this halo trimer is of direct relevance for many-body physics in ultracold mixtures and the association of ultracold molecules.
9+3 pages, 7+1 figures
References in corpus (24)
- Observation of an Efimov spectrum in an atomic system
- Observation of an Efimov-like resonance in ultracold atom-dimer scattering
- Ultracold Fermionic Feshbach Molecules of NaK
- Observation of Efimov Resonances in a Mixture with Extreme Mass Imbalance
- Radio Frequency Association of Efimov Trimers
- Non-equilibrium quantum dynamics and formation of the Bose polaron
- Two and Three-body Contacts in the Unitary Bose Gas
- Universal three-body parameter in heteronuclear atomic systems
- Radio-Frequency Transitions on Weakly-Bound Ultracold Molecules
- Phase separation and collapse in Bose-Fermi mixtures with a Feshbach resonance
- Quantum behavior of a heavy impurity strongly coupled to a Bose gas
- From Efimov Physics to the Bose Polaron using Gaussian States
- Ground-state properties of unitary bosons: from clusters to matter
- Bose-Einstein condensation of Efimovian triples in the unitary Bose gas
- Probing few-body nuclear dynamics via 3H and 3He (e,e'p)pn cross-section measurements
- Suppression of Unitary Three-body Loss in a Degenerate Bose-Fermi Mixture
- Sound propagation in a Bose-Fermi mixture: from weak to strong interactions
- Phase diagram for strong-coupling Bose polarons
- Bunching, clustering, and the buildup of few-body correlations in a quenched unitary Bose gas
- Reshaped Three-Body Interactions and the Observation of an Efimov State in the Continuum
- Strongly interacting Bose-Fermi mixture: mediated interaction, phase diagram and sound propagation
- A coherent superposition of Feshbach dimers and Efimov trimers
- Emergent inflation of the Efimov spectrum under three-body spin-exchange interactions
- Mass Ratio Dependence of Three-Body Resonance Lifetimes in 1D and 3D