Effects of an electric field on Feshbach resonances and the thermal-average scattering rate of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mrow /><mml:mn>6</mml:mn></mml:msup></mml:math>Li-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mrow /><mml:mn>40</mml:mn></mml:msup></mml:math>K collisions

Xie, Ting; Wang, Gao‐Ren; Zhang, Wei; Huang, Yin; Cong, Shu‐Lin

doi:10.1103/physreva.86.032713

Cited by 6 publications

(3 citation statements)

References 29 publications

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“…is the sum of the cross sections of the individual partial waves. The rate coefficient at temperature T is given by [49] vσ…”

Section: Hamiltonian and Basis Representationmentioning

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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“…is the sum of the cross sections of the individual partial waves. The rate coefficient at temperature T is given by [49] vσ…”

Section: Hamiltonian and Basis Representationmentioning

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.

Self Cite

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“…The electric-induced FRs have first been demonstrated in heteronuclear mixtures of bi-alkali atomic gases. [11,12,15,20] The anisotropic interaction between the instantaneous dipole moment of a heteronuclear collision complex with the external electric field, couples the states of different orbital angular momenta with ∆L = L − L = ±1, and results in multiple resonances. The mechanism is thus different from that described here.…”

Section: J = −1 Res1 and Res2mentioning

confidence: 99%

“…The use of combined electric and magnetic fields to control interatomic and intermolecular interactions has also been suggested. It has been demonstrated that dynamics of molecules in a regime of ultracold temperature may be sensitive to the magnitude of an applied field, [15][16][17][18][19] and the combination of electric and magnetic fields may be used to control both the position and width of FRs independently, leading to total control over the character of ultracold collisions. [20] In addition, the magnetic control of collision dynamics is limited to paramagnetic molecules; therefore, the application of electric fields may expand the scope of studies of correlative phenomena in ultracold polar gas.…”

Section: Introductionmentioning

confidence: 99%

Electric-field-modified Feshbach resonances in ultracold atom–molecule collision

Cheng¹,

Wang²,

Feng³

et al. 2017

Chinese Phys. B

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We present a detailed analysis of near zero-energy Feshbach resonances in ultracold collisions of atom and molecule, taking the He-PH system as an example, subject to superimposed electric and magnetic static fields. We find that the electric field can induce Feshbach resonance which cannot occur when only a magnetic field is applied, through couplings of the adjacent rotational states of different parities. We show that the electric field can shift the position of the magnetic Feshbach resonance, and change the amplitude of resonance significantly. Finally, we demonstrate that, for narrow magnetic Feshbach resonance as in most cases of ultracold atom-molecule collision, the electric field may be used to modulate the resonance, because the width of resonance in electric field scale is relatively larger than that in magnetic field scale.

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