Many-body bound states and induced interactions of charged impurities in a bosonic bath

Astrakharchik, G. E.; Ardila, L. A. Peña; Jachymski, Krzysztof; Negretti, Antonio

doi:10.1038/s41467-023-37153-0

Cited by 17 publications

(9 citation statements)

References 71 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…which is the most commonly-used for an ion interacting with a dilute quantum gas [8][9][10]33 ; it has the physical long-range interaction ∝ −C 4 /R 4 and a smooth behavior at short-range. Next, noticing that Eq.…”

Section: Theoretical Approachmentioning

confidence: 99%

“…The unique properties of charged-neutral interactions make a single ion in a neutral bath a testbed for cold chemistry [1][2][3][4][5] , cluster physics 6 , solvation dynamics 7 , and many-body physics [8][9][10][11][12][13] . When an ion is submerged in a sea of neutrals, the ion induces a dipole moment on the atoms that translates into the interaction V (R) = − α 2R 4 , where α is the polarizability of the atom and R is the atom-ion distance.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Ion solvation in atomic baths: from snowballs to polarons

Chowdhury,

RIOS

2024

Preprint

View full text Add to dashboard Cite

Solvation, the result of the complicated interplay between solvent-solute and solvent-internal interactions, is one of the most important chemical processes. Consequently, a complete theoretical understanding of solvation seems a heroic task. However, it is possible to elucidate fundamental solvation mechanisms by looking into simpler systems, such as ion solvation in atomic baths. In this work, we study ion solvation by calculating the ground state properties of a single ion in a neutral bath from the high-density regime to the low-density regime, finding common ground for these two, in principle, disparate regimes. Our results indicate that a single $^{174}$Yb$^+$ ion in a bath of $^{7}$Li atoms forms a coordination complex at high densities with a coordination number of 8, with strong electrostriction, characteristic of the snowball effect. On the contrary, treating the atomic bath as a dilute quantum gas at low densities, we find that the short range of the ion-atom interaction plays a significant role in the physics of many-body bound states and polarons. Furthermore, in this regime, we explore the role of a putative ion trap, which drastically affects the binding mechanism of the ion and atoms from a quantum gas. Therefore, our results give a novel insight into the universality of ion-neutral systems in the ultracold regime and the possibilities of observing exotic many-body effects.

show abstract

Section: Theoretical Approachmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ion solvation in atomic baths: from snowballs to polarons

Chowdhury,

RIOS

2024

Preprint

View full text Add to dashboard Cite

show abstract

“…In particular, induced interactions between two impurities are solely attractive as long as they couple in the same way (i.e. in terms of sign and strength) to the fluctuating medium [38][39][40][41][42][43][44][45][46]. The magnitude of this induced attraction, in general, increases for larger impurity-medium coupling strength and specifically for sufficiently strong attractive ones the impurities assemble in a bound state that can be a bipolaron [32,43,45,[47][48][49] or a trimeron [50].…”

Section: Introductionmentioning

confidence: 99%

Crossover from attractive to repulsive induced interactions and bound states of two distinguishable Bose polarons

Theel,

Mistakidis,

Schmelcher

2024

SciPost Phys.

View full text Add to dashboard Cite

We study the impact of induced correlations and quasiparticle properties by immersing two distinguishable impurities in a harmonically trapped bosonic medium. It is found that when the impurities couple both either repulsively or attractively to their host, the latter mediates a two-body correlated behavior between them. In the reverse case, namely the impurities interact oppositely with the host, they feature anti-bunching. Monitoring the impurities relative distance and constructing an effective two-body model to be compared with the full many-body calculations, we are able to associate the induced (anti-) correlated behavior of the impurities with the presence of attractive (repulsive) induced interactions. Furthermore, we capture the formation of a bipolaron and a trimer state in the strongly attractive regime. The trimer refers to the correlated behavior of two impurities and a representative atom of the bosonic medium and it is characterized by an ellipsoidal shape of the three-body correlation function. Our results open the way for controlling polaron induced correlations and creating relevant bound states.

show abstract

“…The Bose polaron problem [57][58][59][60][61][62] of an impurity immersed in a BEC has proven to be more challenging. We focus on the case of a charge-neutral impurity, but also the case of an ionic impurity has drawn recent theoretical interest [63][64][65]. Despite much effort, a unified understanding is lacking of what happens to the impurity as a function of interaction strength.…”

Section: Introductionmentioning

confidence: 99%

Phase diagram for strong-coupling Bose polarons

Christianen,

Cirac,

Schmidt

2024

SciPost Phys.

View full text Add to dashboard Cite

Important properties of complex quantum many-body systems and their phase diagrams can often already be inferred from the impurity limit. The Bose polaron problem describing an impurity atom immersed in a Bose-Einstein condensate is a paradigmatic example. The interplay between the impurity-mediated attraction between the bosons and their intrinsic repulsion makes this model rich and interesting, but also complex to describe theoretically. To tackle this challenge, we develop a quantum chemistry-inspired computational technique and compare two variational methods that fully include both the boson-impurity and interboson interactions. We find one regime where the impurity-mediated interactions overcome the repulsion between the bosons, so that a sweep of the boson-impurity interaction strength leads to an instability of the polaron due to the formation of many-body clusters. If instead the interboson interactions dominate, the impurity will experience a crossover from a polaron into a few-body bound state. We achieve a unified understanding incorporating both of these regimes and show that they are experimentally accessible. Moreover, we develop an analytical model that allows us to interpret these phenomena in the Landau framework of phase transitions, revealing a deep connection of the Bose polaron model to both few- and many-body physics.

show abstract

Many-body bound states and induced interactions of charged impurities in a bosonic bath

Cited by 17 publications

References 71 publications

Ion solvation in atomic baths: from snowballs to polarons

Ion solvation in atomic baths: from snowballs to polarons

Crossover from attractive to repulsive induced interactions and bound states of two distinguishable Bose polarons

Phase diagram for strong-coupling Bose polarons

Contact Info

Product

Resources

About