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SU(N) symmetry with ultracold alkali dimers: Weak dependence of scattering properties on hyperfine state (2025)
Journal Article
Mukherjee, B., & Hutson, J. M. (2025). SU(N) symmetry with ultracold alkali dimers: Weak dependence of scattering properties on hyperfine state. Physical Review Research, 7(1), Article 013099. https://doi.org/10.1103/PhysRevResearch.7.013099

We investigate the prospect of using ultracold alkali diatomic molecules to implement many-body quantum systems with SU(N) symmetry. Experimentally accessible molecules offer large N for both bosonic and fermionic systems, with both attractive and re... Read More about SU(N) symmetry with ultracold alkali dimers: Weak dependence of scattering properties on hyperfine state.

SU(N) magnetism with ultracold molecules (2025)
Journal Article
Mukherjee, B., Hutson, J. M., & Hazzard, K. R. A. (2025). SU(N) magnetism with ultracold molecules. New Journal of Physics, 27(1), Article 013013. https://doi.org/10.1088/1367-2630/ad89f2

Quantum systems with SU(N) symmetry are paradigmatic settings for quantum many-body physics. They have been studied for the insights they provide into complex materials and their ability to stabilize exotic ground states. Ultracold alkaline-earth ato... Read More about SU(N) magnetism with ultracold molecules.

Bose-Einstein condensation of non-ground-state caesium atoms (2024)
Journal Article
Horvath, M., Dhar, S., Das, A., Frye, M. D., Guo, Y., Hutson, J. M., …Nägerl, H. (2024). Bose-Einstein condensation of non-ground-state caesium atoms. Nature Communications, 15(1), Article 3739. https://doi.org/10.1038/s41467-024-47760-0

Bose-Einstein condensates of ultracold atoms serve as low-entropy sources for a multitude of quantum-science applications, ranging from quantum simulation and quantum many-body physics to proof-of-principle experiments in quantum metrology and quantu... Read More about Bose-Einstein condensation of non-ground-state caesium atoms.

Controlling collisional loss and scattering lengths of ultracold dipolar molecules with static electric fields (2024)
Journal Article
Mukherjee, B., & Hutson, J. M. (2024). Controlling collisional loss and scattering lengths of ultracold dipolar molecules with static electric fields. Physical Review Research, 6(1), Article 013145. https://doi.org/10.1103/physrevresearch.6.013145

Trapped samples of ultracold molecules are often short-lived because close collisions between them result in trap loss. We investigate the use of shielding with static electric fields to create repulsive barriers between polar molecules to prevent su... Read More about Controlling collisional loss and scattering lengths of ultracold dipolar molecules with static electric fields.

Making molecules by mergoassociation: Two atoms in adjacent nonspherical optical traps (2023)
Journal Article
Bird, R. C., Le Sueur, C. R., & Hutson, J. M. (2023). Making molecules by mergoassociation: Two atoms in adjacent nonspherical optical traps. Physical Review Research, 5(4), https://doi.org/10.1103/physrevresearch.5.043086

Mergoassociation of two ultracold atoms to form a weakly bound molecule can occur when two optical traps that each contain a single atom are merged. Molecule formation occurs at an avoided crossing between a molecular state and the lowest motional st... Read More about Making molecules by mergoassociation: Two atoms in adjacent nonspherical optical traps.

Shielding collisions of ultracold CaF molecules with static electric fields (2023)
Journal Article
Mukherjee, B., Frye, M. D., Le Sueur, C. R., Tarbutt, M. R., & Hutson, J. M. (2023). Shielding collisions of ultracold CaF molecules with static electric fields. Physical Review Research, 5(3), Article 033097. https://doi.org/10.1103/physrevresearch.5.033097

We study collisions of ultracold CaF molecules in strong static electric fields. These fields allow the creation of long-range barriers in the interaction potential, effectively preventing the molecules from reaching the short-range region where inel... Read More about Shielding collisions of ultracold CaF molecules with static electric fields.

Tunable Feshbach resonances in collisions of ultracold molecules in 2Σ states with alkali-metal atoms (2023)
Journal Article
Bird, R. C., Tarbutt, M. R., & Hutson, J. M. (2023). Tunable Feshbach resonances in collisions of ultracold molecules in 2Σ states with alkali-metal atoms. Physical Review Research, 5, https://doi.org/10.1103/physrevresearch.5.023184

We consider the magnetically tunable Feshbach resonances that may exist in ultracold mixtures of molecules in 2Σmstates and alkali-metal atoms. We focus on Rb +CaF as a prototype system. There are likely to be Feshbach resonances analogous to those b... Read More about Tunable Feshbach resonances in collisions of ultracold molecules in 2Σ states with alkali-metal atoms.

Formation of Ultracold Molecules by Merging Optical Tweezers (2023)
Journal Article
Ruttley, D. K., Guttridge, A., Spence, S., Bird, R. C., Le Sueur, C. R., Hutson, J. M., & Cornish, S. L. (2023). Formation of Ultracold Molecules by Merging Optical Tweezers. Physical Review Letters, 130(22), https://doi.org/10.1103/physrevlett.130.223401

We demonstrate the formation of a single RbCs molecule during the merging of two optical tweezers, one containing a single Rb atom and the other a single Cs atom. Both atoms are initially predominantly in the motional ground states of their respectiv... Read More about Formation of Ultracold Molecules by Merging Optical Tweezers.

Pinpointing Feshbach resonances and testing Efimov universalities in 39K (2023)
Journal Article
Etrych, J., Martirosyan, G., Cao, A., Glidden, J. A. P., Dogra, L. H., Hutson, J. M., Hadzibabic, Z., & Eigen, C. (2023). Pinpointing Feshbach resonances and testing Efimov universalities in 39K. Physical Review Research, 5(1), Article 013174. https://doi.org/10.1103/physrevresearch.5.013174

Using a combination of bound-state spectroscopy and loss spectroscopy, we pinpoint eight intrastate Feshbach resonances in 39K, as well as six previously unexplored interstate ones. We perform a detailed characterization of four of the intrastate res... Read More about Pinpointing Feshbach resonances and testing Efimov universalities in 39K.

Magnetic Feshbach resonances between atoms in $^2$S and $^3$P$_0$ states: mechanisms and dependence on atomic properties (2023)
Journal Article
Mukherjee, B., Frye, M. D., & Hutson, J. M. (2023). Magnetic Feshbach resonances between atoms in $^2$S and $^3$P$_0$ states: mechanisms and dependence on atomic properties. Physical Review Research, 5, Article 013102. https://doi.org/10.1103/physrevresearch.5.013102

Magnetically tunable Feshbach resonances exist in ultracold collisions between atoms in 2 S and 3 P 0 states, such as an alkali-metal atom colliding with Yb or Sr in a clock state. We investigate the mechanisms of these resonances and identify the te... Read More about Magnetic Feshbach resonances between atoms in $^2$S and $^3$P$_0$ states: mechanisms and dependence on atomic properties.

Feshbach Spectroscopy of Cs Atom Pairs in Optical Tweezers (2022)
Journal Article
Brooks, R. V., Guttridge, A., Frye, M. D., Ruttley, D. K., Spence, S., Hutson, J. M., & Cornish, S. L. (2022). Feshbach Spectroscopy of Cs Atom Pairs in Optical Tweezers. New Journal of Physics, 24, Article 113051. https://doi.org/10.1088/1367-2630/ac99f6

We prepare pairs of 133Cs atoms in a single optical tweezer and perform Feshbach spectroscopy for collisions of atoms in the states (f = 3, mf = ±3). We detect enhancements in pair loss using a detection scheme where the optical tweezers are repeated... Read More about Feshbach Spectroscopy of Cs Atom Pairs in Optical Tweezers.

Observation of magnetic Feshbach resonances between Cs and 173Yb (2022)
Journal Article
Franzen, T., Guttridge, A., Wilson, K. E., Segal, J., Frye, M. D., Hutson, J. M., & Cornish, S. L. (2022). Observation of magnetic Feshbach resonances between Cs and 173Yb. Physical Review Research, 4(4), Article 043072. https://doi.org/10.1103/physrevresearch.4.043072

We report the observation of magnetic Feshbach resonances between 173 Yb and 133 Cs . In a mixture of Cs atoms prepared in the ( f = 3 , m f = 3 ) state and unpolarized fermionic 173 Yb , we observe resonant atom loss due to two sets of magnetic Fesh... Read More about Observation of magnetic Feshbach resonances between Cs and 173Yb.

Diatomic-py: A Python module for calculating the rotational and hyperfine structure of 1Σ molecules (2022)
Journal Article
Blackmore, J. A., Gregory, P. D., Hutson, J. M., & Cornish, S. L. (2023). Diatomic-py: A Python module for calculating the rotational and hyperfine structure of 1Σ molecules. Computer Physics Communications, 282, Article 108512. https://doi.org/10.1016/j.cpc.2022.108512

We present a computer program to calculate the quantised rotational and hyperfine energy levels of diatomic molecules in the presence of dc electric, dc magnetic, and off-resonant optical fields. Our program is applicable to the bialkali molecules us... Read More about Diatomic-py: A Python module for calculating the rotational and hyperfine structure of 1Σ molecules.

Interaction potential for NaCs for ultracold scattering and spectroscopy (2022)
Journal Article
Brookes, S. G. H., & Hutson, J. M. (2022). Interaction potential for NaCs for ultracold scattering and spectroscopy. The Journal of Physical Chemistry A, 126(25), 3987-4001. https://doi.org/10.1021/acs.jpca.2c01810

We obtain the interaction potential for NaCs by fitting to experiments on ultracold scattering and spectroscopy in optical tweezers. The central region of the potential has been accurately determined from Fourier-Transform spectroscopy at higher temp... Read More about Interaction potential for NaCs for ultracold scattering and spectroscopy.

Improved characterization of Feshbach resonances and interaction potentials between 23Na and 87Rb atoms (2022)
Journal Article
Guo, Z., Jia, F., Zhu, B., Li, L., Hutson, J. M., & Wang, D. (2022). Improved characterization of Feshbach resonances and interaction potentials between 23Na and 87Rb atoms. Physical Review A, 105(2), Article 023313. https://doi.org/10.1103/physreva.105.023313

The ultracold mixture of 23Na and 87Rb atoms has become an important system for investigating physics in Bose-Bose atomic mixtures and for forming ultracold ground-state polar molecules. In this work, we provide an improved characterization of the mo... Read More about Improved characterization of Feshbach resonances and interaction potentials between 23Na and 87Rb atoms.

Feshbach resonances and molecule formation in ultracold mixtures of Rb and Yb(3P) atoms (2022)
Journal Article
Mukherjee, B., Frye, M. D., & Hutson, J. M. (2022). Feshbach resonances and molecule formation in ultracold mixtures of Rb and Yb(3P) atoms. Physical Review A, 105(2), Article 023306. https://doi.org/10.1103/physreva.105.023306

We have investigated magnetically tunable Feshbach resonances in ultracold collisions of Rb with Yb in its metastable 3P2 and 3P0 states, using coupled-channel scattering and bound-state calculations. For the 3P2 state, we find sharp resonances when... Read More about Feshbach resonances and molecule formation in ultracold mixtures of Rb and Yb(3P) atoms.

Complexes formed in collisions between ultracold alkali-metal diatomic molecules and atoms (2021)
Journal Article
Frye, M. D., & Hutson, J. M. (2021). Complexes formed in collisions between ultracold alkali-metal diatomic molecules and atoms. New Journal of Physics, 23(12), Article 125008. https://doi.org/10.1088/1367-2630/ac3ff8

We explore the properties of three-atom complexes of alkali-metal diatomic molecules with alkali-metal atoms, which may be formed in ultracold collisions. We estimate the densities of vibrational states at the energy of atom–diatom collisions, and fi... Read More about Complexes formed in collisions between ultracold alkali-metal diatomic molecules and atoms.