Efficient optical schemes to create ultracold KRb molecules in their rovibronic ground state

Borsalino, Dimitri; Londoño-Flórez, Beatriz Elena; Véxiau, Romain; Dulieu, Olivier; Bouloufa-Maafa, Nadia; Luc‐Koenig, E.

doi:10.1103/physreva.90.033413

Cited by 35 publications

(36 citation statements)

References 101 publications

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“…The shift increased with level energies, reaching about 0.9 cm −1 for the highest levels. (5) corresponding to the deperturbed A 1 + and b 3 0 states. The parameters r ref and p were fixed during the fit.…”

Section: (4) 1 + → a − B Lifmentioning

confidence: 99%

Extended Fourier-transform spectroscopy studies and deperturbation analysis of the spin-orbit coupled A1Σ+ and b3Π states in RbCs

Kruzins

Alps

Docenko

et al. 2014

The Journal of Chemical Physics

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The article presents a study of the strongly spin-orbit coupled singlet A(1)Σ(+) and triplet b(3)Π states of the RbCs molecule, which provide an efficient optical path to transfer ultracold molecules to their rovibrational ground state. Fourier-transform A(1)Σ(+) - b(3)Π → X(1)Σ(+) and (4)(1)Σ(+) → A(1)Σ(+) - b(3)Π laser-induced fluorescence (LIF) spectra were recorded for the natural mixture of the (85)Rb(133)Cs and (87)Rb(133)Cs isotopologues produced in a heat pipe oven. Overall 8730 rovibronic term values of A(1)Σ(+) and b(3)Π states were determined with an uncertainty of 0.01 cm(-1) in the energy range [9012, 14087] cm(-1), covering rotational quantum numbers J ∈ [6, 324]. An energy-based deperturbation analysis performed in the framework of the four A(1)Σ(+) - b(3)Π(Ω = 0, 1, 2) coupled-channels approach reproduces 97% of the experimental term values of both isotopologues with a standard deviation of 0.0036 cm(-1). The reliability of the deperturbed mass-invariant potentials and spin-orbit coupling functions of the interacting A(1)Σ(+) and b(3)Π states is additionally proved by a good reproduction of the A - b → X and (4)(1)Σ(+) → A - b relative intensity distributions. The achieved accuracy of the A - b complex description allowed us to use the latter to assign the observed (5)(1)Σ(+) → A - b and (3)(1)Π → A - b transitions. As is demonstrated, LIF to the A - b complex becomes as informative as to the ground X(1)Σ(+) state, which is confirmed by comparing the results of (4)(1)Σ(+) state analysis based on (4)(1)Σ(+) → A - b LIF with the data from V. Zuters et al. [Phys. Rev. A 87, 022504 (2013)] based on (4)(1)Σ(+) → X LIF.

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Section: (4) 1 + → a − B Lifmentioning

confidence: 99%

Extended Fourier-transform spectroscopy studies and deperturbation analysis of the spin-orbit coupled A1Σ+ and b3Π states in RbCs

Kruzins

Alps

Docenko

et al. 2014

The Journal of Chemical Physics

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“…This term is less important for lighter molecules. For the quantum chemistry PECs of LiRb and NaRb we extrapolate the short-range potentials by comparing our ground state quantum chemistry PEC to the RKR potential [54]. For the other molecules this term is not included.…”

Section: Molecular Structure Datamentioning

confidence: 99%

“…the atomic spin-orbit splittings at infinite internuclear distances. For example for KRb we used rescaled NaRb SO couplings (see [54] for more details). We emphasize that table I is by no mean an exhaustive listing of spectroscopic studies on bialkali molecules.…”

Section: Molecular Structure Datamentioning

confidence: 99%

Dynamic dipole polarizabilities of heteronuclear alkali dimers: optical response, trapping and control of ultracold molecules

Véxiau

Borsalino

Lepers

et al. 2017

International Reviews in Physical Chemistry

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In this article we address the general approach for calculating dynamical dipole polarizabilities of small quantum systems, based on a sum-over-states formula involving in principle the entire energy spectrum of the system. We complement this method by a few-parameter model involving a limited number of effective transitions, allowing for a compact and accurate representation of both the isotropic and anisotropic components of the polarizability. We apply the method to the series of ten heteronuclear molecules composed of two of ( 7 Li, 23 Na, 39 K, 87 Rb, 133 Cs) alkali-metal atoms. We rely on both up-to-date spectroscopically-determined potential energy curves for the lowest electronic states, and on our systematic studies of these systems performed during the last decade for higher excited states and for permanent and transition dipole moments. Such a compilation is timely for the continuously growing researches on ultracold polar molecules. Indeed the knowledge of the dynamic dipole polarizabilities is crucial to model the optical response of molecules when trapped in optical lattices, and to determine optimal lattice frequencies ensuring optimal transfer to the absolute ground state of initially weakly-bound molecules. When they exist, we determine the so-called "magic frequencies" where the ac-Stark shift and thus the viewed trap depth, is the same for both weakly-bound and ground-state molecules.

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“…[31]. To subsequently produce ultracold samples of ground-state molecules [14][15][16] we plan on using stimulated Raman adiabatic passage (STIRAP) using a single Λ-configuration with branches at approximately 1000 nm and 1500 nm as suggested in [64] and as has already been mastered in our laboratory using RbCs [8]. We have set up two filter-cavity diode-laser systems capable of achieving linewidths in the vicinity of 1 Hz when locked to a vacuum-enclosed stable ultra-low expansion (ULE) reference resonator [65] with the aim to reach STIRAP efficiencies of 90% and above.…”

Section: Discussionmentioning

confidence: 99%

A new quantum gas apparatus for ultracold mixtures of K and Cs and KCs ground-state molecules

Gröbner

Weinmann

Meinert

et al. 2016

Journal of Modern Optics

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We present a new quantum gas apparatus for ultracold mixtures of K and Cs atoms and ultracold samples of KCs ground-state molecules. We demonstrate the apparatus' capabilities by producing Bose-Einstein condensates (BEC) of 39 K and 133 Cs in a manner that will eventually allow sequential condensation within one experimental cycle, precise sample overlap, and magnetic association of atoms into KCs molecules. The condensates are created independently without relying on sympathetic cooling. Our approach is universal and applicable to other species combinations when the two species show dramatically different behavior in terms of loss mechanisms and post laser cooling temperatures, i.e. species combinations that make parallel generation of quantum degenerate samples challenging. We give an outlook over the next experiments involving e.g. sample mixing, molecule formation, and transport into a science chamber for high-resolution spatial imaging of novel quantum-many body phases based on K-Cs.

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Efficient optical schemes to create ultracold KRb molecules in their rovibronic ground state

Cited by 35 publications

References 101 publications

Extended Fourier-transform spectroscopy studies and deperturbation analysis of the spin-orbit coupled A1Σ+ and b3Π states in RbCs

Extended Fourier-transform spectroscopy studies and deperturbation analysis of the spin-orbit coupled A1Σ+ and b3Π states in RbCs

Dynamic dipole polarizabilities of heteronuclear alkali dimers: optical response, trapping and control of ultracold molecules

A new quantum gas apparatus for ultracold mixtures of K and Cs and KCs ground-state molecules

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