Precise Feshbach resonance spectroscopy using tight anharmonic traps

Jachymski, Krzysztof

doi:10.1088/1361-6455/ab66d4

Cited by 2 publications

(2 citation statements)

References 44 publications

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“…The high densities achievable when there are two particles in the same tightly confining trapping potential aid the detection of extremely narrow resonances [14]. It has also been proposed that a double-well tweezer could be used to estimate the pole strength of Feshbach resonances [15]. By extension, effects involving three or more bodies could be measured by preparing exactly three or more atoms in the same tweezer [7].…”

Section: Introductionmentioning

confidence: 99%

Feshbach spectroscopy of Cs atom pairs in optical tweezers

Brooks

Guttridge²,

Frye³

et al. 2022

New J. Phys.

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We prepare pairs of $^{133}$Cs atoms in a single optical tweezer and perform Feshbach spectroscopy for collisions of atoms in the states $(f=3, m_f=\pm3)$. We detect enhancements in pair loss using a detection scheme where the optical tweezers are repeatedly subdivided. For atoms in the state $(3,-3)$, we identify resonant features by performing inelastic loss spectroscopy. We carry out coupled-channel scattering calculations and show that at typical experimental temperatures the loss features are mostly centred on zeroes in the scattering length, rather than resonance centres. We measure the number of atoms remaining after a collision, elucidating how the different loss processes are influenced by the tweezer depth. These measurements probe the energy released during an inelastic collision, and thus give information on the states of the collision products. We also identify resonances with atom pairs prepared in the absolute ground state $(f=3, m_f=3)$, where two-body radiative loss is engineered by an excitation laser blue-detuned from the Cs D$_2$ line. These results demonstrate optical tweezers to be a versatile tool to study two-body collisions with number-resolved detection sensitivity.

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Section: Introductionmentioning

confidence: 99%

Feshbach spectroscopy of Cs atom pairs in optical tweezers

Brooks

Guttridge²,

Frye³

et al. 2022

New J. Phys.

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“…Magnetically tuned Feshbach resonances (MFRs) [1][2][3][4][5][6][7][8][9][10][11][12][13][14] provide a tool for modulating the interaction between ultracold atoms or molecules. The scattering length can be modulated by a magnetic field to vary from positive to negative infinities in the vicinity of s-wave Feshbach resonance, which facilitates the observation and evaluation of the Bose-Einstein-condensation-Bardeen-Cooper-Schrieffer (BEC-BCS) crossover [15][16][17][18], BEC [19][20][21][22] and superfluid [23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Feshbach resonances of nonzero partial waves at different collision energies

Li¹,

Yang²,

Lyu³

et al. 2021

J. Phys. B: At. Mol. Opt. Phys.

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Taking the ultracold 85Rb–87Rb collision system as an example, we investigated the Feshbach resonances of nonzero partial waves above the threshold. The self-energy at the threshold, which represents the coupling strength between open and closed channels, is considered a critical parameter to quantitatively describe the properties of Feshbach resonances. The total elastic and inelastic cross sections are calculated as functions of the magnetic field B and collision energy E col, ranging from 0.1 to 600 μK. For a large absolute value of the self-energy at the threshold, the resonance decays rapidly with increasing collision energy, and narrow resonances of nonzero partial waves can be clearly resolved in the contour plot of the inelastic cross section versus the collision energy and magnetic field. It was found that the resonance tail appeared at the given magnetic field when the cross section decreased from the maximal value of the resonance peak to the minimum value, where a long resonance tail indicates an appreciable resonance in a relatively large region of collision energy. This relationship between the self-energy and the properties of Feshbach resonances still exists in the thermally averaged inelastic rate coefficient. The bound-state energies for nonzero partial waves split owing to the spin–spin interaction, which results in multiple nearly-overlapping resonances. Both the spin–spin and second-order spin–orbit effects are included. However, multiple nearly-overlapping resonances for nonzero partial waves are difficult to resolve in thermally averaged rate coefficients.

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Precise Feshbach resonance spectroscopy using tight anharmonic traps

Cited by 2 publications

References 44 publications

Feshbach spectroscopy of Cs atom pairs in optical tweezers

Feshbach spectroscopy of Cs atom pairs in optical tweezers

Feshbach resonances of nonzero partial waves at different collision energies

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