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Peer-reviewedCC BY 4.0Physical Review Research

Long-range states in collisions of ultracold molecules

  • James F. E. Croft1
  • Brian K. Kendrick2
  • Jeremy M. Hutson1
  1. 1Durham University
  2. 2Los Alamos National Laboratory
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Abstract

We use coupled-channel calculations to explore the nature of near-threshold bound states in a simplified model of Rb + KRb . This is a prototype for systems with very strong coupling at short range and chaotic behavior for the short-range states. We find that there are states with strong long-range character that exist close to threshold and probably persist to depths at least 100 GHz below each threshold. These states are only weakly coupled to the short-range states and do not form part of the chaotic manifold. Since they spend little time at short range, they are relatively insensitive to destruction by laser light. They can thus have long lifetimes that are unrelated to the density of states and can cause narrow Feshbach resonances when the states are shifted across thresholds by external fields.

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Cite

BibTeXRIS
BibTeX
@article{croft2026longrange,
  title = {{Long-range states in collisions of ultracold molecules}},
  author = {James F. E. Croft and Brian K. Kendrick and Jeremy M. Hutson},
  journal = {Physical Review Research},
  year = {2026},
  month = oct,
  doi = {10.1103/fvjz-ymg4},
  url = {http://link.aps.org/doi/10.1103/fvjz-ymg4},
  note = {CC BY 4.0},
}
RIS
TY  - JOUR
TI  - Long-range states in collisions of ultracold molecules
AU  - James F. E. Croft
AU  - Brian K. Kendrick
AU  - Jeremy M. Hutson
PY  - 2026
DA  - 2026/10/23
JO  - Physical Review Research
DO  - 10.1103/fvjz-ymg4
UR  - http://link.aps.org/doi/10.1103/fvjz-ymg4
AB  - We use coupled-channel calculations to explore the nature of near-threshold bound states in a simplified model of Rb + KRb . This is a prototype for systems with very strong coupling at short range and chaotic behavior for the short-range states. We find that there are states with strong long-range character that exist close to threshold and probably persist to depths at least 100 GHz below each threshold. These states are only weakly coupled to the short-range states and do not form part of the chaotic manifold. Since they spend little time at short range, they are relatively insensitive to destruction by laser light. They can thus have long lifetimes that are unrelated to the density of states and can cause narrow Feshbach resonances when the states are shifted across thresholds by external fields.
SN  - 2643-1564
ER  -