Hyperfine structure of electronically-excited states of the <sup>39</sup>K<sup>133</sup>Cs molecule

Orbán, A.; Xie, Ting; Véxiau, Romain; Dulieu, Olivier; Bouloufa-Maafa, Nadia

doi:10.1088/1361-6455/ab1d94

Cited by 10 publications

(10 citation statements)

References 41 publications

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“…The hyperfine interactions are neglected in our framework based on two facts: On one hand, the shielding probability relies on the relative slopes of the ground and excited states and the position of the resonant point R C . Though the hyperfine splitting energy is comparable with the light detuning we use here, our calculations show it has no effect on the slope of fine structure potential curves [47]. On the other hand, the influence of hyperfine interaction on the shielding efficiency can be ignored completely if a strong magnetic field is applied [31].…”

Section: Theory Of Optical Shieldingmentioning

confidence: 74%

“…We choose the example of 39 K-Cs binary collisions, following our previous investigations on this system [45][46][47], which is of experimental interest [48], but still rarely explored. An overview of the relevant potential energy curves (PECs) relevant for the present study is displayed in Fig.…”

Section: Introductionmentioning

confidence: 99%

“…2), and thus are possible candidates for OS. In particular the (3) 3 Σ + PEC has a high barrier at short distance [47], and one expects that efficient OS could be achieved based on such a state. This paper is organized as follows: In Section II the theory of OS is presented in a general atom-atom case, relying on a Hamiltonian expressed in the light-dressedstate picture.…”

Section: Introductionmentioning

confidence: 99%

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Engineering long-range interactions between ultracold atoms with light

Xie,

Orbán,

Xing

et al. 2021

Preprint

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Ultracold temperatures in dilute quantum gases opened the way to an exquisite control of matter at the quantum level. Here we focus on the control of ultracold atomic collisions using a laser to engineer their interactions at large interatomic distances. We show that the entrance channel of two colliding ultracold atoms can be coupled to a repulsive collisional channel by the laser light so that the overall interaction between the two atoms becomes repulsive: this prevents them to come close together and to undergo inelastic processes, thus protecting the atomic gases from unwanted losses. We illustrate such an optical shielding mechanism with potassium and cesium atoms colliding at ultracold temperature (<1 microkelvin). The process is described in the framework of the dressedstate picture and we then solve the resulting staionary coupled Schrödinger equations. The role of spontaneous emission and photoinduced inelastic scattering is also investigated as possible limitations of the shielding efficiency. We predict an almost complete suppression of inelastic collisions using a laser-induced coupling characterized by a Rabi frequency of ω = 200 MHz and a frequency detuned from the potassium D2 transition by ∆ = 200 MHz. We found the polarization of the laser has no influence on this efficiency. This proposal could easily be formulated for other bi-alkali-metal pairs as their long-range interaction are all very similar to each other.

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Section: Theory Of Optical Shieldingmentioning

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Engineering long-range interactions between ultracold atoms with light

Xie,

Orbán,

Xing

et al. 2021

Preprint

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“…The potential-energy curves that we compute present shallow long-range wells with a few vibrational levels, strong magnetic moments and non-zero induced electric dipole moments, even though the considered molecule is homonuclear [60,61]. We also find numerous repulsive curves that may be used for optical shielding of collisions between ground-level holmium atoms [62][63][64][65][66].…”

Section: Introductionmentioning

confidence: 85%

Purely long-range polar molecules composed of identical lanthanide atoms

Quéméner

Wyart

et al. 2019

Phys. Rev. A

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Doubly polar molecules, possessing an electric dipole moment and a magnetic dipole moment, can strongly couple to both an external electric field and a magnetic field, providing unique opportunities to exert full control of the system quantum state at ultracold temperatures. We propose a method for creating a purely long-range doubly polar homonuclear molecule from a pair of strongly magnetic lanthanide atoms, one atom being in its ground level and the other in a superposition of quasi-degenerate opposite-parity excited levels [Phys. Rev. Lett. 121, 063201 (2018)]. The electric dipole moment is induced by coupling the excited levels with an external electric field. We derive the general expression of the long-range, Stark, and Zeeman interaction energies in the properly symmetrized and fully-coupled basis describing the diatomic complex. Taking the example of holmium, our calculations predict shallow long-range wells in the potential energy curves that may support vibrational levels accessible by direct photoassociation from pairs of ground-level atoms.arXiv:1907.03853v1 [physics.atom-ph]

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“…[5,6] new PECs and various matrix non-adiabatic elements were calculated, necessary to treat the strongly coupled excited electronic states. The series of theoretical papers on KCs was supplemented by models of the hyperfine structure (HFS) of excited electronic states [7].…”

Section: Introductionmentioning

confidence: 99%

The $a^3Σ^+$ state of KCs revisited: hyperfine structure analysis and potential refinement

Krumins,

Tamanis,

Ferber

et al. 2022

Preprint

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Laser-induced fluorescence spectra of the c 3 Σ + (vc, Jc = Nc) → a 3 Σ + (va, Na = Jc ± 1) transitions excited from the ground X 1 Σ + state of 39 K 133 Cs molecule were recorded with Fourier-transform spectrometer IFS125-HR (Bruker) at the highest achievable spectral resolution of 0.0063 cm −1 . Systematic study of the hyperfine structure (HFS) of the a 3 Σ + state for levels with va ∈ [0, 27] and Na ∈ [24, 90] shows that the splitting monotonically increases with va. The spectroscopic study was supported by ab initio calculations of the magnetic hyperfine interaction in X 1 Σ + and a 3 Σ + states. The discovered variation of the electronic matrix elements with the internuclear distance R is in a good agreement with the observed va-dependencies of the HFS. Overall set of available experimental data on the a 3 Σ + state was used to improve the potential energy curve particularly near a bottom, providing the refined dissociation energy De=267.21(1) cm −1 . The ab initio HFS matrix elements, combined with the empirical X 1 Σ + and a 3 Σ + PECs in the framework of the invented coupled-channel deperturbation model, reproduce the experimental term values of both ground states within 0.003 cm −1 accuracy up to their common dissociation limit.

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Hyperfine structure of electronically-excited states of the ³⁹K¹³³Cs molecule

Cited by 10 publications

References 41 publications

Engineering long-range interactions between ultracold atoms with light

Engineering long-range interactions between ultracold atoms with light

Purely long-range polar molecules composed of identical lanthanide atoms

The $a^3Σ^+$ state of KCs revisited: hyperfine structure analysis and potential refinement

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Hyperfine structure of electronically-excited states of the 39K133Cs molecule

Cited by 10 publications

References 41 publications

Engineering long-range interactions between ultracold atoms with light

Engineering long-range interactions between ultracold atoms with light

Purely long-range polar molecules composed of identical lanthanide atoms

The $a^3Σ^+$ state of KCs revisited: hyperfine structure analysis and potential refinement

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Hyperfine structure of electronically-excited states of the ³⁹K¹³³Cs molecule