Theory of excitation of Rydberg polarons in an atomic quantum gas

Schmidt, Richard; Whalen, J. D.; Ding, Roger; Camargo, Francisco; Woehl, Germano; Yoshida, S.; Burgdörfer, Joachim; Dunning, F. B.; Demler, Eugene; Sadeghpour, H. R.; Killian, T. C.

doi:10.1103/physreva.97.022707

Cited by 52 publications

(62 citation statements)

References 66 publications

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“…Studying the line shapes of the excitation spectra revealed sharp lines caused by the formation of molecules in the few-atom regime, which turn into a broad shift in the many-atom limit (Gaj et al, 2014), where a Rydberg polaron can be formed (Camargo et al, 2018). The theoretical description of Rydberg polarons has been provided by (Schmidt et al, , 2018b in terms of the functional determinant approach. The role of the atomic ion in such systems has so far been rather marginal.…”

Section: Schemes Involving Rydberg Excitationsmentioning

confidence: 99%

“…II.E). Polarons are attracting increasingly large interest in the ultracold quantum matter community (Ardila and Giorgini, 2016;Ashida et al, 2018;Camargo et al, 2018;Casteels et al, 2013;Guenther et al, 2018;Hu et al, 2016;Jørgensen et al, 2016;Levinsen et al, 2015;Parisi and Giorgini, 2017;Schmidt et al, 2016Schmidt et al, , 2018bShchadilova et al, 2016) as the simplest example of nontrivial quantum field theory. In this arena, ion-atom systems could provide new insight into the problem, especially in the strong coupling regime (Casteels et al, 2011;Grusdt et al, 2017;Schurer et al, 2017;Tempere et al, 2009), as well as allow to study the effects of long-range interactions.…”

Section: B Quantum Simulationmentioning

confidence: 99%

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Cold hybrid ion-atom systems

et al. 2019

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Hybrid systems of laser-cooled trapped ions and ultracold atoms combined in a single experimental setup have recently emerged as a new platform for fundamental research in quantum physics. This paper reviews the theoretical and experimental progress in research on cold hybrid ion-atom systems which aim to combine the best features of the two well-established fields. We provide a broad overview of the theoretical description of ion-atom mixtures and their applications, and report on advances in experiments with ions trapped in Paul or dipole traps overlapped with a cloud of cold atoms, and with ions directly produced in a Bose-Einstein condensate. We start with microscopic models describing the electronic structure, interactions, and collisional physics of ion-atom systems at low and ultralow temperatures, including radiative and non-radiative charge transfer processes and their control with magnetically tunable Feshbach resonances. Then we describe the relevant experimental techniques and the intrinsic properties of hybrid systems. In particular, we discuss the impact of the micromotion of ions in Paul traps on ion-atom hybrid systems. Next, we review recent proposals for using ions immersed in ultracold gases for studying cold collisions, chemistry, many-body physics, quantum simulation, and quantum computation and their experimental realizations. In the last part we focus on the formation of molecular ions via spontaneous radiative association, photoassociation, magnetoassociation, and sympathetic cooling. We discuss applications and prospects of cold molecular ions for cold controlled chemistry and precision spectroscopy.

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Section: Schemes Involving Rydberg Excitationsmentioning

confidence: 99%

Section: B Quantum Simulationmentioning

confidence: 99%

Cold hybrid ion-atom systems

et al. 2019

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“…The reverse RF scheme had been implemented for the observation of the full impurity spectral function by Kohstall et al [67], and found multiple applications in the observation of polaronic physics with ultracold atoms [31,58,67,70,[92][93][94][95].…”

Section: A Radio-frequency Spectroscopymentioning

confidence: 99%

Universal many-body response of heavy impurities coupled to a Fermi sea: a review of recent progress

et al. 2018

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In this report we discuss the dynamical response of heavy quantum impurities immersed in a Fermi gas at zero and at finite temperature. Studying both the frequency and the time domain allows one to identify interaction regimes that are characterized by distinct many-body dynamics. From this theoretical study a picture emerges in which impurity dynamics is universal on essentially all time scales, and where the high-frequency few-body response is related to the long-time dynamics of the Anderson orthogonality catastrophe by Tan relations. Our theoretical description relies on different and complementary approaches: functional determinants give an exact numerical solution for time- and frequency-resolved responses, bosonization provides accurate analytical expressions at low temperatures, and the theory of Toeplitz determinants allows one to analytically predict response up to high temperatures. Using these approaches we predict the thermal decoherence rate of the fermionic system and prove that within the considered model the fastest rate of long-time decoherence is given by [Formula: see text]. We show that Feshbach resonances in cold atomic systems give access to new interaction regimes where quantum effects can prevail even in the thermal regime of many-body dynamics. The key signature of this phenomenon is a crossover between different exponential decay rates of the real-time Ramsey signal. It is shown that the physics of the orthogonality catastrophe is experimentally observable up to temperatures [Formula: see text] where it leaves its fingerprint in a power-law temperature dependence of thermal spectral weight and we review how this phenomenon is related to the physics of heavy ions in liquid [Formula: see text]He and the formation of Fermi polarons. The presented results are in excellent agreement with recent experiments on LiK mixtures, and we predict several new phenomena that can be tested using currently available experimental technology.

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“…These are characterized in terms of Feynman diagrams by a vertex joining two impurity lines and two phonon lines. Such processes have also been shown to be crucial for the description of Rydberg polarons [30]. This realization has lead to intense theoretical efforts to explicitly incorporate the extended Fröhlich interactions in various analytical methods that were developed for and applied to the Fröhlich model [31][32][33][34].…”

Section: Introductionmentioning

confidence: 99%

Feynman path-integral treatment of the Bose polaron beyond the Fröhlich model

Ichmoukhamedov

Tempere

2019

Phys. Rev. A

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An impurity immersed in a Bose-Einstein condensate is no longer accurately described by the Fröhlich Hamiltonian as the coupling between the impurity and the boson bath gets stronger. We study the dominant effects of the twophonon terms beyond the Fröhlich model on the ground state properties of the polaron using Feynman's variational path-integral approach. The previously reported discrepancy in the effective mass between the renormalization group approach and this theory is shown to be absent in the beyond-Fröhlich model on the positive side of the Feshbach resonance. Self-trapping, characterized by a sharp and dramatic increase of the effective mass, is no longer observed for the repulsive polaron once the two-phonon interactions are included. For the attractive polaron we find a divergence of the ground state energy and effective mass at weaker couplings than previously observed within the Fröhlich model. * timour.ichmoukhamedov@uantwerpen.be arXiv:1905.07368v1 [cond-mat.quant-gas]

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Theory of excitation of Rydberg polarons in an atomic quantum gas

Cited by 52 publications

References 66 publications

Cold hybrid ion-atom systems

Cold hybrid ion-atom systems

Universal many-body response of heavy impurities coupled to a Fermi sea: a review of recent progress

Feynman path-integral treatment of the Bose polaron beyond the Fröhlich model

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