Charged Polarons and Molecules in a Bose-Einstein Condensate

Christensen, E.R.; Camacho-Guardián, Arturo; Bruun, Georg M.

doi:10.1103/physrevlett.126.243001

Cited by 25 publications

(38 citation statements)

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“…In the weakly interacting regime, the induced interaction corresponds to a Yukawatype of interaction in 3D [42] or exponential trend in 1D [44,53]. A two-body impurityimpurity (bipolaron state) bound state always exist for −1 < 1/k n a 12 < 0, hence it may favor the formation of few-body bound states, akin to the case of ionic polarons [54,55] where a many-body bound state emerges from bound two-body correlations. In fact, from our calculations, higher concentrations of impurities may drive the system into clusterization.…”

Section: Resultsmentioning

confidence: 99%

Ultra-Dilute Gas of Polarons in a Bose–Einstein Condensate

Ardila

2022

Atoms

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We investigate the properties of a dilute gas of impurities embedded in an ultracold gas of bosons that forms a Bose–Einstein condensate (BEC). This work focuses mainly on the equation of state (EoS) of the impurity gas at zero temperature and the induced interaction between impurities mediated by the host bath. We use perturbative field-theory approaches, such as Hugenholtz–Pines formalism, in the weakly interacting regime. In turn, for strong interactions, we aim at non-perturbative techniques such as quantum–Monte Carlo (QMC) methods. Our findings agree with experimental observations for an ultra dilute gas of impurities, modeled in the framework of the single impurity problem; however, as the density of impurities increases, systematic deviations are displayed with respect to the one-body Bose polaron problem.

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Section: Resultsmentioning

confidence: 99%

Ultra-Dilute Gas of Polarons in a Bose–Einstein Condensate

Ardila

2022

Atoms

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“…Furthermore, given the fact that very deep bound states are less likely populated, one can conclude that the fermionic statistic of the gas does not allow to populate more than the most loosely bound state of the polarization potential, thus losing eventually a single atom of the bath per ion. This would be not the case if the bath would be bosonic for which mesoscopic molecular ions can be formed [52,[72][73][74].…”

Section: Discussionmentioning

confidence: 99%

Quantum-limited thermometry of a Fermi gas with a charged spin particle

Oghittu,

Negretti

2022

Preprint

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We investigate the sensitivity of an ion sensor in determining the temperature of an atomic Fermi gas. Our study extends to charged impurities the proposal by M. T. Mitchison et al. Phys. Rev. Lett. 125, 080402 (2020), where atomic neutral impurities were used as an in situ thermometer of the quantum gas. We find that the long-range character of the atom-ion interaction enhances the thermometer's sensitivity for certain system parameters. In addition, we investigate the impact of the ion quantum motional state on the sensitivity by assuming that it is confined in a harmonic trap. We observe that the temperature sensitivity of the ion is noticeably influenced by its spatial extension, making the latter a versatile tool to be manipulated for improving the thermometer performance. We finally discuss our findings in the context of current experimental atom-ion mixtures.

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“…These experiments build on the earlier experimental work on hybrid systems (Smith et al, 2005;Grier et al, 2009;Zipkes et al, 2010;Schmid et al, 2010;Ravi et al, 2012;Haze et al, 2015;Meir et al, 2016;Schowalter et al, 2016;Kleinbach et al, 2018), which looked the reactions that take place (Härter et al, 2012;Ratschbacher et al, 2012Ratschbacher et al, , 2013Haze et al, 2015;Krükow et al, 2016;Saito et al, 2017) and studied the cold ion-atom collisions (Zipkes et al, 2011;Meir et al, 2016;. The ongoing work is further stimulated by the recent theory insights into, e.g., ion-atom interactions (Tscherbul et al, 2016;Schmid et al, 2018;Secker et al, 2017;Côté and Simbotin, 2018;Śmia lkowski and Tomza, 2020;Tomza and Lisaj, 2020;Wang et al, 2020;Dörfler et al, 2020;Bosworth et al, 2021;Pérez-Ríos, 2021b), quantum simulation of impurity and many-body physics (Bissbort et al, 2013;Negretti et al, 2014;Schurer et al, 2014;Midya et al, 2016;Pérez-Ríos, 2021a;Astrakharchik et al, 2021;Christensen et al, 2021Christensen et al, , 2022Oghittu et al, 2021;Ding et al, 2022) and proposals for applications in quantum information processing…”

Section: Introductionmentioning

confidence: 91%

“…By improving the control of the electric fields and the spatial resolution of the detection scheme, single collisions could be detectable. This opens the possibility to probe the quantum regime of ion impurity transport (Côté, 2000), formation of mesoscopic molecular ions (Côté et al, 2002) and more specifically charged polaron physics (Casteels et al, 2011;Astrakharchik et al, 2021;Christensen et al, 2021;Oghittu et al, 2021). Here, high resolution microscope techniques and momentum spectroscopy as developed for quantum gases could be useful, e.g.…”

Section: Ion Transportmentioning

confidence: 99%

Ultracold ion-atom experiments: cooling, chemistry, and quantum effects

Lous,

Gerritsma

2022

Preprint

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Experimental setups that study laser-cooled ions immersed in baths of ultracold atoms merge the two exciting and well-established fields of quantum gases and trapped ions. These experiments benefit both from the exquisite read-out and control of the few-body ion systems as well as the many-body aspects, tunable interactions, and ultracold temperatures of the atoms. However, combining the two leads to challenges both in the experimental design and the physics that can be studied. Nevertheless, these systems have provided insights into ion-atom collisions, buffer gas cooling of ions and quantum effects in the ion-atom interaction. This makes them promising candidates for ultracold quantum chemistry studies, creation of cold molecular ions for spectroscopy and precision measurements, and as test beds for quantum simulation of charged impurity physics. In this review we aim to provide an experimental account of recent progress and introduce the experimental setup and techniques that enabled the observation of quantum effects.

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Charged Polarons and Molecules in a Bose-Einstein Condensate

Cited by 25 publications

References 50 publications

Ultra-Dilute Gas of Polarons in a Bose–Einstein Condensate

Ultra-Dilute Gas of Polarons in a Bose–Einstein Condensate

Quantum-limited thermometry of a Fermi gas with a charged spin particle

Ultracold ion-atom experiments: cooling, chemistry, and quantum effects

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