Polarons and their induced interactions in highly imbalanced triple mixtures

Keiler, Kevin; Mistakidis, S. I.; Schmelcher, Peter

doi:10.1103/physreva.104.l031301

Cited by 17 publications

(20 citation statements)

References 103 publications

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“…Additionally, the intervals where either the nonmagnetic polaron takes place or the quasiparticle picture is no longer valid (due to medium-impurity phaseseparation) are delineated. The latter two phases are known to also occur in the genuine three-component system [45,46]. However, here we demonstrate that it is the presence of Rabi-coupling that proliferates the development of magnetization phenomena and consequently the magnetic polaron [37].…”

Section: Introductionmentioning

confidence: 47%

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

Mistakidis,

Koutentakis,

Grusdt

et al. 2022

Preprint

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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 (Fröhlich-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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Section: Introductionmentioning

confidence: 47%

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

Mistakidis,

Koutentakis,

Grusdt

et al. 2022

Preprint

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“…In addition, the case of an impurity in a strongly interacting Bose gas or with long-range interactions [90][91][92][93] is interesting to study, where perturbative and mean-field approaches are of limited use or invalid. A more complex system with two impurity atoms, known as the bipolaron problem [27,[94][95][96][97], at non-zero momentum is also interesting due to its connection to high-temperature superconductivity [95,96]. .…”

Section: Discussionmentioning

confidence: 99%

Polaron-Depleton Transition in the Yrast Excitations of a One-Dimensional Bose Gas with a Mobile Impurity

et al. 2022

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We present exact numerical data for the lowest-energy momentum eigenstates (yrast states) of a repulsive spin impurity in a one-dimensional Bose gas using full configuration interaction quantum Monte Carlo (FCIQMC). As a stochastic extension of exact diagonalization, it is well suited for the study of yrast states of a lattice-renormalized model for a quantum gas. Yrast states carry valuable information about the dynamic properties of slow-moving mobile impurities immersed in a many-body system. Based on the energies and the first and second-order correlation functions of yrast states, we identify different dynamical regimes and the transitions between them: The polaron regime, where the impurity’s motion is affected by the Bose gas through a renormalized effective mass; a regime of a gray soliton that is weakly correlated with a stationary impurity, and the depleton regime, where the impurity occupies a dark or gray soliton. Extracting the depleton effective mass reveals a super heavy regime where the magnitude of the (negative) depleton mass exceeds the mass of the finite Bose gas.

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“…2 ) along its diagonal. In this particular case the impurities can be understood as dressed particles which then form a bound state also referred to as a bipolaron [35,36,39].…”

Section: Characterization Of the Ground Statementioning

confidence: 99%

“…Recently, more attention has been placed on the interplay between several impurities immersed in a quantum gas [28][29][30][31]. Among others, the coalescence of two bosonic impurities coupled to a harmonically trapped bosonic medium has been predicted [32] as well as the existence of their induced interactions [33][34][35]. In the strongly attractive interaction regime, the formation of bipolarons referring to impurity bound states was also unraveled [36,37].…”

Section: Introductionmentioning

confidence: 99%

Counterflow dynamics of two correlated impurities immersed in a bosonic gas

Theel,

Mistakidis,

Keiler

et al. 2021

Preprint

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The counterflow many-body dynamics of two impurities in a double-well coupled to an onedimensional bosonic medium is explored. We determine the ground state phase diagram of the system according to the impurity-medium entanglement and the impurities two-body correlations. Specifically, bound impurity structures reminiscent of bipolarons for strong attractive couplings as well as configurations with two clustered or separated impurities in the repulsive case are identified. The interval of existence of these phases depends strongly on the impurity-impurity interactions and external confinement of the medium. Accordingly the impurities dynamical response, triggered by ramping down the central potential barrier, is affected by the medium's trapping geometry. In particular, for a box-confined medium repulsive impurity-medium couplings lead, due to attractive induced interactions, to the localization of the impurities around the trap center. In contrast, for a harmonically trapped medium the impurities perform a periodic collision and expansion dynamics further interpreted in terms of a two-body effective model. Our findings elucidate the correlation aspects of the collisional physics of impurities which should be accessible in recent cold atom experiments.

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Polarons and their induced interactions in highly imbalanced triple mixtures

Cited by 17 publications

References 103 publications

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

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

Polaron-Depleton Transition in the Yrast Excitations of a One-Dimensional Bose Gas with a Mobile Impurity

Counterflow dynamics of two correlated impurities immersed in a bosonic gas

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