arXiv:1905.11977 · Physical Review A

Magnetic Feshbach resonances in ultracold collisions between Cs and Yb atoms

Bing Yang, Matthew D. Frye, Alexander Guttridge, J. Aldegunde, Piotr Szymon Żuchowski, Simon L. Cornish, Jeremy M. Hutson

Published Aug 15, 2019• 18 citations

arXiv HTML PDF

Abstract

We investigate magnetically tunable Feshbach resonances in ultracold collisions between ground-state Yb and Cs atoms, using coupled-channel calculations based on an interaction potential recently determined from photoassociation spectroscopy. We predict resonance positions and widths for all stable isotopes of Yb, together with resonance decay parameters where appropriate. The resonance patterns are richer and more complicated for fermionic Yb than for spin-zero isotopes, because there are additional level splittings and couplings due to scalar and tensorial Yb hyperfine interactions. We examine collisions involving Cs atoms in a variety of hyperfine states and identify resonances that appear most promising for experimental observation and for magnetoassociation to form ultracold CsYb molecules.

DOI: 10.1103/physreva.100.022704

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arXiv:1905.11977 · Physical Review A

Magnetic Feshbach resonances in ultracold collisions between Cs and Yb atoms

Bing Yang, Matthew D. Frye, Alexander Guttridge, J. Aldegunde, Piotr Szymon Żuchowski, Simon L. Cornish, Jeremy M. Hutson

Published Aug 15, 2019• 18 citations

arXiv HTML PDF

Abstract

DOI: 10.1103/physreva.100.022704

Related papers

Feshbach resonances and molecule formation in ultracold mixtures of Rb and Yb(P3) atoms

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We have investigated magnetically tunable Feshbach resonances in ultracold collisions of Rb with Yb in its metastable

{}^{3}{P}_{2}

and

{}^{3}{P}_{0}

states, using coupled-channel scattering and bound-state calculations. For the

{}^{3}{P}_{2}

state, we find sharp resonances when both atoms are in their lowest Zeeman sublevels. However, these resonances are decayed by inelastic processes that produce Yb atoms in

{}^{3}{P}_{1}

and

{}^{3}{P}_{0}

states. The molecules that might be produced by magnetoassociation at the

{}^{3}{P}_{2}

thresholds can decay by similar pathways and would have lifetimes no more than a few microseconds. For the

{}^{3}{P}_{0}

state, by contrast, there are resonances that are promising for magnetoassociation. There are resonances due to both rotating and nonrotating molecular states that are significantly stronger than the analogous resonances for

\mathrm{Yb}{(}^{1}S

). The ones due to rotating states are denser in magnetic field; in contrast to

\mathrm{Yb}{(}^{1}S

), they exist even for bosonic isotopes of

\mathrm{Yb}{(}^{3}{P}_{0}

Magnetically tunable Feshbach resonances exist in ultracold collisions between atoms in

^{2}\mathrm{S}

and

{}^{3}{\mathrm{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 terms in the collision Hamiltonian responsible for them. They involve indirect coupling between the open and closed channels, via intermediate channels involving atoms in

{}^{3}{\mathrm{P}}_{1}

states. The resonance widths are generally proportional to the square of the magnetic field and are strongly enhanced when the magnitude of the background scattering length is large. For any given pair of atoms, the scattering length can be tuned discretely by choosing different isotopes of the

{}^{3}{\mathrm{P}}_{0}

atom. For each combination of an alkali-metal atom and either Yb or Sr, we consider the prospects of finding an isotopic combination that has both a large background scattering length and resonances at a high but experimentally accessible field. We conclude that

^{87}\mathrm{Rb}+\mathrm{Yb}

\mathrm{Cs}+\mathrm{Yb}

, and

^{85}\mathrm{Rb}+\mathrm{Sr}

are particularly promising combinations.

Observation of magnetic Feshbach resonances between Cs and

{}^{173}

We report the first 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 Feshbach resonances around 622~G and 702~G. Resonances for individual Yb nuclear spin components

m_{i,\mathrm{Yb}}

are split by its interaction with the Cs electronic spin, which also provides the main coupling mechanism for the observed resonances. The observed splittings and relative resonance strengths are in good agreement with theoretical predictions from coupled-channel calculations.