Control of anomalous diffusion of a Bose polaron

Charalambous, Christos; García-March, Miguel Ángel; Muñoz-Gil, Gorka; Grzybowski, Przemysław R.; Lewenstein, Maciej

doi:10.22331/q-2020-02-20-232

Cited by 17 publications

(12 citation statements)

References 87 publications

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“…Furthermore, Binary BECs due to their multiple tunable interactions and other parameters can manifest significant features such as phase separation and the droplet phase, which does not occur in the case of a single bath. These characters impact the properties of Bose polarons leading to more fruitful and interesting results [26][27][28][29][30]. The possible results of this theme provide insights to understand the behaviors of polarons in intricate systems, and opportunities to test previous polaron theories.…”

Section: Introductionmentioning

confidence: 89%

Polarons in Binary Bose-Einstein Condensates

Liu¹,

Tu²

2022

Preprint

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Impurities coupled with collective excitations of Bose-Einstein condensates lead to the emergence of Bose polarons. In this paper, we investigate the properties of a single impurity immersed in binary Bose-Einstein condensates in the framework of the Lee-Low-Pines variational approach.We derive an effective Fröhlich Hamiltonian with two kinds of effective impurity-phonon interactions, i.e., the interactions of the impurity-density branch and impurity-spin branch. The stability criterion against phase separation limits the impurity-spin branch's behavior. We show that the Bose polaron in a small momentum has explicit analytical results in single and interacting binary baths. In the case of bosons with equal mass, we find the polaron properties are proportional or inversely proportional to √ a +(−) , a +(−) is a reduced scattering length of density branch (+) and spin branch (−). Whereas in the case of unequal mass bosons, we illustrate that the density and spin branch can transform each other via a permutation of mass of two kinds of bosons. These integral results provide fundamental understandings of behaviors of polarons in Bose baths with multiple components.

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Section: Introductionmentioning

confidence: 89%

Polarons in Binary Bose-Einstein Condensates

Liu¹,

Tu²

2022

Preprint

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“…Interestingly, it was predicted [36,38] that there is also the possibility of mediating repulsive impurity-impurity interactions when two impurities are coupled with different signs to a bosonic bath. In this sense, the underlying experimentally relevant three-component system [16,18] al-lows to unravel additional polaronic properties as it has been also argued by immersing impurities into a two-component pseudospinor mixture [4][5][6][49][50][51][52] in order to create, for instance, spinwave excitations and magnetic polarons [4,5], impurities diffusive response [50] or to facilitate the detection of the dressing cloud via interferometry [4]. However, quasiparticle formation in three-component systems is largely unexplored, besides the few above-mentioned recent studies.…”

Section: Introductionmentioning

confidence: 95%

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

Theel¹,

Mistakidis²,

Schmelcher³

2023

Preprint

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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 trimer state in the strongly attractive regime, where the latter consists of two impurities and a medium atom. Our results open the way for controlling polaron induced correlations and creating relevant bound states.

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“…A proposal to detect the polaron cloud, composed of many-body bound states in the strong-coupling regime, using interferometric techniques in a ferromagnetic gas was made [37]. Also, it was argued that a spinor bath can lead to polaronic subdiffusive behavior [38].…”

Section: Introductionmentioning

confidence: 99%

Inducing spin-order with an impurity: phase diagram of the magnetic Bose polaron

et al. 2022

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We investigate the formation of magnetic Bose polaron, an impurity atom dressed by spin-wave excitations, in a one-dimensional spinor Bose gas. In terms of an effective potential model the impurity is strongly confined by the host excitations which can even overcome the impurity-medium repulsion leading to a self-localized quasi-particle state. The phase diagram of the attractive and self-bound repulsive magnetic polaron, repulsive non-magnetic (Fr{" o}hlich-type) polaron and impurity-medium phase-separation regimes is explored with respect to the Rabi-coupling between the spin components, spin-spin interactions and impurity-medium coupling. The residue of such magnetic polarons decreases substantially in both strong attractive and repulsive branches with strong impurity-spin interactions, illustrating significant dressing of the impurity. The impurity can be used to probe and maneuver the spin polarization of the magnetic medium while suppressing ferromagnetic spin-spin correlations. It is shown that mean-field theory fails as the spinor gas approaches immiscibility since the generated spin-wave excitations are prominent. Our findings illustrate that impurities can be utilized to generate controllable spin-spin correlations and magnetic polaron states which can be realized with current cold atom setups.

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Control of anomalous diffusion of a Bose polaron

Cited by 17 publications

References 87 publications

Polarons in Binary Bose-Einstein Condensates

Polarons in Binary Bose-Einstein Condensates

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

Inducing spin-order with an impurity: phase diagram of the magnetic Bose polaron

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