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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.

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.

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.

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.

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.

Molecule-molecule and atom-molecule collisions with ultracold RbCs molecules (2021)
Journal Article
Gregory, P., Blackmore, J., Frye, M., Fernley, L., Bromley, S., Hutson, J. M., & Cornish, S. L. (2021). Molecule-molecule and atom-molecule collisions with ultracold RbCs molecules. New Journal of Physics, 23, Article 125004. https://doi.org/10.1088/1367-2630/ac3c63

Understanding ultracold collisions involving molecules is of fundamental importance for current experiments, where inelastic collisions typically limit the lifetime of molecular ensembles in optical traps. Here we present a broad study of optically t... Read More about Molecule-molecule and atom-molecule collisions with ultracold RbCs molecules.

Magnetic Feshbach resonances in collisions of 23Na40K with 40K (2021)
Journal Article
Wang, X., Frye, M. D., Su, Z., Cao, J., Liu, L., Zhang, D., …Pan, J. (2021). Magnetic Feshbach resonances in collisions of 23Na40K with 40K. New Journal of Physics, 23(11), Article 115010. https://doi.org/10.1088/1367-2630/ac3318

We present measurements of more than 80 magnetic Feshbach resonances in collisions of ultracold 23Na40K with 40K. We assign quantum numbers to a group of low-field resonances and show that they are probably due to long-range states of the triatomic c... Read More about Magnetic Feshbach resonances in collisions of 23Na40K with 40K.

Collisions in a dual-species magneto-optical trap of molecules and atoms (2021)
Journal Article
Jurgilas, S., Chakraborty, A., Rich, C. J. H., Sauer, B. E., Frye, M. D., Hutson, J. M., & Tarbutt, M. R. (2021). Collisions in a dual-species magneto-optical trap of molecules and atoms. New Journal of Physics, 23(7), Article 075004. https://doi.org/10.1088/1367-2630/ac0c9a

We study inelastic collisions between CaF molecules and 87Rb atoms in a dual-species magneto-optical trap. The presence of atoms increases the loss rate of molecules from the trap. By measuring the loss rates and density distributions, we determine a... Read More about Collisions in a dual-species magneto-optical trap of molecules and atoms.

Collisions between Ultracold Molecules and Atoms in a Magnetic Trap (2021)
Journal Article
Jurgilas, S., Chakraborty, A., Rich, C., Caldwell, L., Williams, H., Fitch, N., …Tarbutt, M. (2021). Collisions between Ultracold Molecules and Atoms in a Magnetic Trap. Physical Review Letters, 126(15), Article 153401. https://doi.org/10.1103/physrevlett.126.153401

We prepare mixtures of ultracold CaF molecules and Rb atoms in a magnetic trap and study their inelastic collisions. When the atoms are prepared in the spin-stretched state and the molecules in the spin-stretched component of the first rotationally e... Read More about Collisions between Ultracold Molecules and Atoms in a Magnetic Trap.

Observation of Efimov Universality across a Nonuniversal Feshbach Resonance in K39 (2020)
Journal Article
Xie, X., Van de Graaff, M. J., Chapurin, R., Frye, M. D., Hutson, J. M., D’Incao, J. P., …Cornell, E. A. (2020). Observation of Efimov Universality across a Nonuniversal Feshbach Resonance in K39. Physical Review Letters, 125(24), Article 243401. https://doi.org/10.1103/physrevlett.125.243401

We study three-atom inelastic scattering in ultracold 39 K near a Feshbach resonance of intermediate coupling strength. The nonuniversal character of such resonance leads to an abnormally large Efimov absolute length scale and a relatively small effe... Read More about Observation of Efimov Universality across a Nonuniversal Feshbach Resonance in K39.

Prospects of Forming High-Spin Polar Molecules from Ultracold Atoms (2020)
Journal Article
Frye, M. D., Cornish, S. L., & Hutson, J. M. (2020). Prospects of Forming High-Spin Polar Molecules from Ultracold Atoms. Physical Review X, 10(4), Article 041005. https://doi.org/10.1103/physrevx.10.041005

We investigate Feshbach resonances in collisions of high-spin atoms such as Er and Dy with closed-shell atoms such as Sr and Yb, using coupled-channel scattering and bound-state calculations. We consider both low-anisotropy and high-anisotropy limits... Read More about Prospects of Forming High-Spin Polar Molecules from Ultracold Atoms.

Characterizing quasibound states and scattering resonances (2020)
Journal Article
Frye, M. D., & Hutson, J. M. (2020). Characterizing quasibound states and scattering resonances. Physical Review Research, 2(1), Article 013291. https://doi.org/10.1103/physrevresearch.2.013291

Characterizing quasibound states from coupled-channel scattering calculations can be a laborious task, involving extensive manual iteration and fitting. We present an automated procedure, based on the phase shift or S-matrix eigenphase sum, that reli... Read More about Characterizing quasibound states and scattering resonances.

Time delays in ultracold atomic and molecular collisions (2019)
Journal Article
Frye, M. D., & Hutson, J. M. (2019). Time delays in ultracold atomic and molecular collisions. Physical Review Research, 1(3), Article 033023. https://doi.org/10.1103/physrevresearch.1.033023

We study the behavior of the Eisenbud-Wigner collisional time delay around Feshbach resonances in cold and ultracold atomic and molecular collisions. We carry out coupled-channel scattering calculations on ultracold Rb and Cs collisions. In the low-e... Read More about Time delays in ultracold atomic and molecular collisions.

Ultracold collisions of Cs atoms in excited Zeeman and hyperfine states (2019)
Journal Article
Frye, M. D., Yang, B., & Hutson, J. M. (2019). Ultracold collisions of Cs atoms in excited Zeeman and hyperfine states. Physical Review A, 100(2), Article 022702. https://doi.org/10.1103/physreva.100.022702

We investigate Cs + Cs scattering in excited Zeeman and hyperfine states. We calculate the real and imaginary parts of the s-wave scattering length; the imaginary part directly provides the rate coefficient for two-body inelastic loss, while the real... Read More about Ultracold collisions of Cs atoms in excited Zeeman and hyperfine states.

Sticky collisions of ultracold RbCs molecules (2019)
Journal Article
Gregory, P. D., Frye, M. D., Blackmore, J. A., Bridge, E. M., Sawant, R., Hutson, J. M., & Cornish, S. L. (2019). Sticky collisions of ultracold RbCs molecules. Nature Communications, 10(1), Article 3104. https://doi.org/10.1038/s41467-019-11033-y

Understanding and controlling collisions is crucial to the burgeoning field of ultracold molecules. All experiments so far have observed fast loss of molecules from the trap. However, the dominant mechanism for collisional loss is not well understood... Read More about Sticky collisions of ultracold RbCs molecules.

Near-threshold bound states of the dipole-dipole interaction (2018)
Journal Article
Karman, T., Frye, M. D., Reddel, J. D., & Hutson, J. M. (2018). Near-threshold bound states of the dipole-dipole interaction. Physical Review A, 98(6), Article 062502. https://doi.org/10.1103/physreva.98.062502

We study the two-body bound states of a model Hamiltonian that describes the interaction between two field-oriented dipole moments. This model has been used extensively in the many-body physics of ultracold polar molecules and magnetic atoms, but its... Read More about Near-threshold bound states of the dipole-dipole interaction.

Characterizing Feshbach resonances in ultracold scattering calculations (2017)
Journal Article
Frye, M. D., & Hutson, J. M. (2017). Characterizing Feshbach resonances in ultracold scattering calculations. Physical Review A, 96(4), Article 042705. https://doi.org/10.1103/physreva.96.042705

We describe procedures for converging on and characterizing zero-energy Feshbach resonances that appear in scattering lengths for ultracold atomic and molecular collisions as a function of an external field. The elastic procedure is appropriate for p... Read More about Characterizing Feshbach resonances in ultracold scattering calculations.