High-resolution molecular spectroscopy for producing ultracold absolute-ground-state 
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 molecules

Guo, Minjie; Véxiau, Romain; Zhu, Bing; Lü, Bo; Bouloufa-Maafa, Nadia; Dulieu, Olivier; Wang, Dajun

doi:10.1103/physreva.96.052505

Cited by 26 publications

(24 citation statements)

References 32 publications

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“…Typically, the spectroscopy is done starting from a Feshbach molecule state, searching for excited states and the ground state by utilizing loss measurements including dark resonance (Autler-Townes) and dark state (electromagnetically induced transparency, EIT) effects. The findings are reported for example for 40 K 87 Rb [49], 23 Na 40 K [82], 23 Na 87 Rb [83,84] and 6 Li 40 K [85]. The excited states are chosen in a way that they provide a decent admixture of singlet and triplet character and therefore offer a good coupling strength to the mainly a 3 Σ + Feshbach molecule state as well as to the pure X 1 Σ + ground state.…”

Section: Ultracold Atomicmentioning

confidence: 99%

Ultracold Gas of Bosonic Na23K39 Ground-State Mo

et al. 2020

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Ultracold bialkali polar molecules play a leading part at the frontline of quantum physics. They recently attract a lot of attention in the field of ultracold quantum chemistry, quantum many-body physics and quantum simulations. The key for their success is the rich internal level structure with rotational and vibrational degrees of freedom and their large electric dipole moments. Still, only a handful of molecular species are available at ultracold temperatures until now, although it is highly desirable to produce new molecular species to further expand the range of applications. Besides direct laser cooling methods for molecules, the assembly of heteronuclear groundstate molecules from ultracold atomic mixtures is the most promising approach for the creation of polar molecules. It includes the formation of weakly bound Feshbach molecules from the diatomic mixture and the subsequent two-photon stimulated Raman adiabatic passage (STIRAP) transfer to the rovibrational ground state. This creation strategy has been successfully demonstrated for the first time in the pioneering experiments at JILA with ultracold 40 K 87 Rb molecules. Since then, only a few more molecular species from different alkali atoms have been created, namely 6 Li 23 Na, 23 Na 40 K, 23 Na 87 Rb and 87 Rb 133 Cs.In this thesis, I report the successful creation of a new species of ultracold polar ground-state molecules: 23 Na 39 K. Starting from an ultracold mixture of bosonic 23 Na and 39 K atoms, weakly bound molecules are created. For this purpose, a Feshbach resonance in a high angular momentum scattering channel is chosen, experimentally identified and characterized. Close to this resonance the weakly bound Feshbach molecules are formed using resonant radio frequency radiation. For the two-photon ground-state transfer, a unique, highly specialized two-color laser system is designed and realized. It is used for one-and two-photon spectroscopy to identify the relevant transitions for the ground-state transfer. Based on the obtained data, a local model of the singlet-triplet mixed excited state manifolds is developed, with which the hyperfine structure and the magnetic field dependence is predicted with high accuracy. According to these findings, a suitable pathway to a single hyperfine ground state is chosen considering selection rules and experimental conditions such as laser polarization and beam alignment. To precisely determine the two-photon resonance condition for STIRAP, electromagnetically induced transparency measurements are performed. The ground-state transfer is then performed using STIRAP. The experimental findings regarding the STIRAP are successfully supported theoretically by a model based on a five-level master equation. The pure molecular gas shows evidence for two-body dominated loss mechanisms, such as sticky four-body collisions. The molecule-atom mixture of 23 Na 39 K+ 39 K reveals an unexpectedly low loss rate coefficient although sticky three-body collisions are assumed to occur. This behavior demands further investigat...

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Section: Ultracold Atomicmentioning

confidence: 99%

Ultracold Gas of Bosonic Na23K39 Ground-State Mo

et al. 2020

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“…Here F and m F are the quantum numbers of the atomic hyperfine level and its projection, respectively. For the population transfer, the |v = 55, J = 1 level of the A 1 Σ + /b 3 Π mixed state was used as the intermediate level [18,30]. With a typical transfer efficiency of 93%, up to 1.5 × 10 4 optically trapped ground-state molecules could be created with near 100% quantum state purity [18].…”

Section: A Ground-state Molecule Preparation and Polarizationmentioning

confidence: 99%

“…[23], while the rotational coefficient C rot 6 follows directly from the dipole-dipole interaction in the second order. We also used the aforementioned experimental µ 0 [18] and B v [30] values in the calculation. The C rot 6 has a ±12% uncertainty mainly from the uncertainty of the µ 0 measurement.…”

Section: B Quantum Close-coupled Modelingmentioning

confidence: 99%

Dipolar Collisions of Ultracold Ground-State Bosonic Molecules

Guo

et al. 2018

Phys. Rev. X

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The dipolar collision between ultracold polar molecules is an important topic both by its own right from the fundamental point of view and for the successful exploration of many-body physics with strong and long-range dipolar interactions. Here, we report the investigation of collisions between ultracold ground-state sodium-rubidium molecules in electric fields with induced electric dipole moments as large as 0.7 D. We observe a step-wise enhancement of losses due to the coupling between different partial waves induced by the increasingly stronger anisotropic dipolar interactions. Varying the temperature of our sample, we find good agreement with theoretical loss rates assuming complex formation as the main loss process. Our results shed new light on the understanding of complex molecular collisions in the presence of strong dipolar interactions and also demonstrate the versatility of modifying molecular interactions with electric fields. * Present address: 5. Physikalisches

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“…the undressed, zero-temperature limit, the binding energy is given simply by the difference in photon energy of the two lasers, E b1 = (ω 2 − ω 1 ), when on two-photon resonance. This technique has been applied in a large number of single-species [62][63][64][65][66][67][68][69][70][71] and two-species ultracold atom experiments [13,[72][73][74][75][76] with considerable success.…”

Section: A Overviewmentioning

confidence: 99%

Two-photon photoassociation spectroscopy of CsYb: Ground-state interaction potential and interspecies scattering lengths

et al. 2018

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We perform two-photon photoassociation spectroscopy of the heteronuclear CsYb molecule to measure the binding energies of near-threshold vibrational levels of the X 2 Σ + 1/2 molecular ground state. We report results for 133 Cs 170 Yb, 133 Cs 173 Yb and 133 Cs 174 Yb, in each case determining the energy of several vibrational levels including the least-bound state. We fit an interaction potential based on electronic structure calculations to the binding energies for all three isotopologs and find that the ground-state potential supports 77 vibrational levels. We use the fitted potential to predict the interspecies s-wave scattering lengths for all seven Cs+Yb isotopic mixtures.

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High-resolution molecular spectroscopy for producing ultracold absolute-ground-state Na23Rb87 molecules

Cited by 26 publications

References 32 publications

Ultracold Gas of Bosonic Na23K39 Ground-State Mo

Ultracold Gas of Bosonic Na23K39 Ground-State Mo

Dipolar Collisions of Ultracold Ground-State Bosonic Molecules

Two-photon photoassociation spectroscopy of CsYb: Ground-state interaction potential and interspecies scattering lengths

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