Formation of ultracold $^{39}$K$^{133}$Cs Feshbach molecules
Fuente:
arXiv
Saved in:
| Main Authors: | , , , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2025
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866912607270600704 |
|---|---|
| author | Beulenkamp, Charly Zamarski, Krzysztof P. Bird, Robert C. Sueur, C. Ruth Le Hutson, Jeremy M. Landini, Manuele Nägerl, Hanns-Christoph |
| author_facet | Beulenkamp, Charly Zamarski, Krzysztof P. Bird, Robert C. Sueur, C. Ruth Le Hutson, Jeremy M. Landini, Manuele Nägerl, Hanns-Christoph |
| contents | We report the creation of an ultracold gas of bosonic $^{39}$K$^{133}$Cs molecules. We first demonstrate a cooling strategy relying on sympathetic cooling of $^{133}$Cs to produce an ultracold mixture. From this mixture, weakly bound molecules are formed using a Feshbach resonance at 361.7 G. The molecular gas contains $7.6(10)\times 10^3$ molecules with a lifetime of about 130 ms, limited by two-body decay. We perform Feshbach spectroscopy to observe several new interspecies resonances and characterize the bound state used for magnetoassociation. Finally, we fit the combined results to obtain improved K-Cs interaction potentials. This provides a good starting point for the creation of ultracold samples of ground-state $^{39}$K$^{133}$Cs molecules. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_16520 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Formation of ultracold $^{39}$K$^{133}$Cs Feshbach molecules Beulenkamp, Charly Zamarski, Krzysztof P. Bird, Robert C. Sueur, C. Ruth Le Hutson, Jeremy M. Landini, Manuele Nägerl, Hanns-Christoph Quantum Gases Atomic Physics We report the creation of an ultracold gas of bosonic $^{39}$K$^{133}$Cs molecules. We first demonstrate a cooling strategy relying on sympathetic cooling of $^{133}$Cs to produce an ultracold mixture. From this mixture, weakly bound molecules are formed using a Feshbach resonance at 361.7 G. The molecular gas contains $7.6(10)\times 10^3$ molecules with a lifetime of about 130 ms, limited by two-body decay. We perform Feshbach spectroscopy to observe several new interspecies resonances and characterize the bound state used for magnetoassociation. Finally, we fit the combined results to obtain improved K-Cs interaction potentials. This provides a good starting point for the creation of ultracold samples of ground-state $^{39}$K$^{133}$Cs molecules. |
| title | Formation of ultracold $^{39}$K$^{133}$Cs Feshbach molecules |
| topic | Quantum Gases Atomic Physics |
| url | https://arxiv.org/abs/2506.16520 |