Observation of collisions between cold Li atoms and 
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Joger, J.; Fürst, H.; Ewald, N. V.; Feldker, T.; Tomza, Michał; Gerritsma, R.

doi:10.1103/physreva.96.030703

Cited by 69 publications

(81 citation statements)

References 44 publications

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“…We construct and solve a quantum microscopic model of cold atom-ion interactions and collisions based on the ab initio multi-channel description of the Yb + -Li system as we presented in Refs. [15,30]. The Hamiltonian used for the nuclear motion accounts completely for all relevant degrees of freedom including the singlet and triplet molecular electronic states, the molecular rotation, and the hyperfine and Zeeman interactions.…”

Section: E Quantum Scattering Calculationsmentioning

confidence: 99%

Buffer gas cooling of a trapped ion to the quantum regime

et al. 2020

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Great advances in precision quantum measurement have been achieved with trapped ions and atomic gases at the lowest possible temperatures [1-3]. These successes have inspired ideas to merge the two systems [4]. In this way one can study the unique properties of ionic impurities inside a quantum fluid [5][6][7][8][9][10][11] or explore buffer gas cooling of the trapped ion quantum computer [12]. Remarkably, in spite of its importance, experiments with atom-ion mixtures remained firmly confined to the classical collision regime [13]. We report a collision energy of 1.15(0.23) times the s-wave energy (or 9.9(2.0) µK) for a trapped ytterbium ion in an ultracold lithium gas. We observed a deviation from classical Langevin theory by studying the spin-exchange dynamics, indicating quantum behavior in the atom-ion collisions. Our results open up numerous opportunities, such as the exploration of atom-ion Feshbach resonances [14,15], in analogy to neutral systems [16].

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Section: E Quantum Scattering Calculationsmentioning

confidence: 99%

Buffer gas cooling of a trapped ion to the quantum regime

et al. 2020

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“…Alkaline-earth-metal ions and alkali-metal atoms are employed because of their electronic sturcture favorable for laser cooling. Several cold atomic ion-atom combinations have already been experimentally investigated, including: Yb + +Yb [9], Ca + +Rb [10], Ba + +Ca [11], Yb + +Ca [12], Yb + +Rb [13], Ca + +Li [14], Ca + +Rb [15], Ca + +Na [16], Yb + +Li [17,18], Sr + +Rb [19], Rb + +Rb [20,21], Na + +Na [22].…”

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Interactions and chemical reactions in ionic alkali-metal and alkaline-earth-metal diatomic AB+ and triatomic A2B+ systems

Śmiałkowski

Tomza

2020

Phys. Rev. A

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We theoretically characterize interactions, energetics, and chemical reaction paths in ionic twobody and three-body systems of alkali-metal and alkaline-earth-metal atoms in the context of modern experiments with cold hybrid ion-atom mixtures. Using ab initio techniques of quantum chemistry such as the coupled-cluster method, we calculate ground-state electronic properties of all diatomic AB + and most of triatomic A2B + molecular ions consisting of Li, Na, K, Rb, Cs, Mg, Ca, Sr, Ba, and Yb atoms. Different geometries and wave-function symmetries of the ground state are found for different classes of molecular ions. We analyze intermolecular interactions in the investigated systems including additive two-body and nonadditive three-body ones. As an example we provide twodimensional interaction potential energy surfaces for KRb + +K and Rb + +Sr2 mixtures. We identify possible channels of chemical reactions based on the energetics of the reactants. The present results may be useful for investigating controlled chemical reactions and other applications of molecular ions formed in cold hybrid ion-atom systems.

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“…The energy threshold for realizing quantum scattering in atom-ion systems is also strongly affected by the mass as given by E th = 4 2C4µ 2 , where µ is an atom-ion reduced mass. Therefore, the mixture composed of Li atoms presented here is considered suitable for ultracold atom-ion physics, as well as the recently realized Li-Yb + mixture [11].…”

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Cooling Dynamics of a Single Trapped Ion via Elastic Collisions with Small-Mass Atoms

et al. 2018

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We demonstrated sympathetic cooling of a single ion in a buffer gas of ultracold atoms with small mass. Efficient collisional cooling was realized by suppressing collision-induced heating. We attempt to explain the experimental results with a simple rate equation model and provide a quantitative discussion of the cooling efficiency per collision. The knowledge we obtained in this work is an important ingredient for advancing the technique of sympathetic cooling of ions with neutral atoms.PACS numbers: 37.10. Ty,03.67.Lx Sympathetic cooling, where we thermally contact two distinct systems at different temperatures, is an effective method for cooling an object to a desired energy regime. Nowadays, this is commonly used in the field of low-temperature physics for producing a cold sample for a molecular beam or degenerate atomic gases. The elemental mechanism of this technique extracts energy from a target object through interaction (normally by collisions) with a coolant system. In cooling of translational motion, for example, an exchange of moment between the two systems can remove kinetic energy from the thermal system, and eventually they reach thermal equilibrium, resulting in cooling of the target object.To introduce an ultracold atomic gas as a coolant for trapped ions is attractive, since collisions with ultracold atoms enable efficient cooling of a number of vibrational modes simultaneously. It is beneficial for many applications, for example, continuous cooling of ion qubits in quantum information processing. In addition, this method has been proven to be effective for the cooling of atomic or molecular systems, especially when no conventional laser cooling transition is accessible, as demonstrated in rotational-vibrational cooling of molecular ions [1,2].In buffer-gas cooling of a charged particle, however, the situation is not as simple as in the usual schemes, e.g., evaporation or sympathetic cooling in a mixture of neutral gases. This is simply attributed to the dynamics of trapping it in a radiofrequency (RF) trap, where slow (secular) and rapid (micro) motion are superimposed on the motion of the ion. The main point is that an abrupt interception of coherent ion motion by an atom-ion collision complicates the kinetics of the ion. Importantly, an ion can be either cooled or even heated, depending on the instantaneous phase of micromotion at the moment of a collision, which prevents efficient collisional cooling [3]. In addition, this peculiar feature modifies the energy distribution of an ion by inducing a deviation from a normal (Maxwell-Boltzmann) distribution to * haze@ils.uec.ac.jp a super-statistical (so-called Tsallis) distribution accompanied with a power-law tail in a high-energy region [4][5][6]. These subjects have been pointed out since the early stages of ion trapping experiments [7], and they were recently revisited again in conjunction with the rapidly growing field of ultracold atom-ion hybrid systems [8].A key parameter for characterizing the kinetics of the ion in a buffer gas is t...

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Observation of collisions between cold Li atoms and Yb+ ions

Cited by 69 publications

References 44 publications

Buffer gas cooling of a trapped ion to the quantum regime

Buffer gas cooling of a trapped ion to the quantum regime

Interactions and chemical reactions in ionic alkali-metal and alkaline-earth-metal diatomic AB+ and triatomic A2B+ systems

Cooling Dynamics of a Single Trapped Ion via Elastic Collisions with Small-Mass Atoms

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