Critical slowdown of non-equilibrium polaron dynamics

Nielsen, K. Knakkergaard; Ardila, L. A. Peña; Bruun, Georg M.; Pohl, Thomas

doi:10.1088/1367-2630/ab0a81

Cited by 59 publications

(91 citation statements)

References 53 publications

(114 reference statements)

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“…figure 6(f) at t=15). We should also remark that a similar overall dynamical behavior on the single-particle level has been reported in the case of a single spinor impurity and has been also related to an enhanced energy transfer from the impurity to the bosonic bath [35,68,69,75]. Such an energy transfer process takes place also in the present case (results not shown here).…”

Section: Density Evolution and Effective Potentialsupporting

confidence: 88%

Many-body quantum dynamics and induced correlations of Bose polarons

Mistakidis¹,

Koutentakis

Katsimiga³

et al. 2020

New J. Phys.

123

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We study the ground state properties and non-equilibrium dynamics of two spinor bosonic impurities immersed in a one-dimensional bosonic gas upon applying an interspecies interaction quench. For the ground state of two non-interacting impurities we reveal signatures of attractive induced interactions in both cases of attractive or repulsive interspecies interactions, while a weak impurityimpurity repulsion forces the impurities to stay apart. Turning to the quench dynamics we inspect the time-evolution of the contrast unveiling the existence, dynamical deformation and the orthogonality catastrophe of Bose polarons. We find that for an increasing postquench repulsion the impurities reside in a superposition of two distinct two-body configurations while at strong repulsions their corresponding two-body correlation patterns show a spatially delocalized behavior evincing the involvement of higher excited states. For attractive interspecies couplings, the impurities exhibit a tendency to localize at the origin and remarkably for strong attractions they experience a mutual attraction on the two-body level that is imprinted as a density hump on the bosonic bath.

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Section: Density Evolution and Effective Potentialsupporting

confidence: 88%

Many-body quantum dynamics and induced correlations of Bose polarons

Mistakidis¹,

Koutentakis

Katsimiga³

et al. 2020

New J. Phys.

123

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“…Similar energy exchange processes between the impurity and the host atoms have already been observed e.g. in [24,64]. Deeper in the evolution, t>100, all energy components acquire an almost constant value with E B (t)<E BI (t)<E I (t).…”

Section: Interspecies Energy Transfersupporting

confidence: 70%

“…0<t<5, the energy of the bath E B (t) and the impurity E I (t) increase whilst the interaction energy E BI (t) reduces. The increasing behavior of E I (t) indicates that the impurity gains kinetic energy due to the quench transferring also a part of its energy to the bosonic gas [24,64] which creates sound waves, see also figure 7(f). For later evolution times E I (t) remains almost constant since the impurity is strongly localized while E B (t) and E BI (t) fluctuate due to the existence of sound waves in the BEC background [67].…”

Section: Interspecies Energy Exchangementioning

confidence: 98%

“…Indeed, we can deduce that X t I á ñ ( ) oscillates with a decaying amplitude in time which is more pronounced deeper in the attractive regime of interactions, compare X t I á ñ ( ) for g BI =−0.5 and g BI =−2. This attenuation of the oscillation amplitude of X t I á ñ ( ) is a direct effect of the presence of interspecies interactions and the underlying energy transfer process from the impurity to the bath, see also the discussion below and[25,64]. Also, -like shape tends to be more localized for larger negative values…”

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confidence: 93%

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Dissipative correlated dynamics of a moving impurity immersed in a Bose–Einstein condensate

Mistakidis¹,

Grusdt

Koutentakis³

et al. 2019

New J. Phys.

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We unravel the nonequilibrium correlated quantum quench dynamics of an impurity traveling through a harmonically confined Bose-Einstein condensate in one-dimension. For weak repulsive interspecies interactions the impurity oscillates within the bosonic gas. At strong repulsions and depending on its prequench position the impurity moves towards an edge of the bosonic medium and subsequently equilibrates. This equilibration being present independently of the initial velocity, the position and the mass of the impurity is inherently related to the generation of entanglement in the many-body system. Focusing on attractive interactions the impurity performs a damped oscillatory motion within the bosonic bath, a behavior that becomes more evident for stronger attractions. To elucidate our understanding of the dynamics an effective potential picture is constructed. The effective mass of the emergent quasiparticle is measured and found to be generically larger than the bare one, especially for strong attractions. In all cases, a transfer of energy from the impurity to the bosonic medium takes place. Finally, by averaging over a sample of simulated in situ single-shot images we expose how the singleparticle density distributions and the two-body interspecies correlations can be probed.

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“…In the future, it would be definitely interesting to better understand the applicability and validity of our strategy to describe the dynamics at nonzero temperature of systems involving an impurity in a thermal bath. This would have relevant applications in current research on impurity physics with atomic quantum gases, e.g., in order to better understand the role of finite-temperature effects on the polaron formation, especially in view of its coherence properties, which are typically analyzed in the framework of the (Markovian) quantum master equation formalism [43,92].…”

Section: Discussionmentioning

confidence: 99%

Compound atom-ion Josephson junction: Effects of finite temperature and ion motion

et al. 2019

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We consider a degenerate Bose gas confined in a double-well potential in interaction with a trapped ion in one dimension and investigate the impact of two relevant sources of imperfections in experiments on the system dynamics: ion motion and thermal excitations of the bosonic ensemble. Particularly, their influence on the entanglement generation between the spin state of the moving ion and the atomic ensemble is analyzed. We find that the detrimental effects of the ion motion on the entanglement protocol can be mitigated by properly choosing the double-well parameters as well as timings of the protocol. Furthermore, thermal excitations of the bosons affect significantly the system's tunneling and self-trapping dynamics at moderate temperatures; i.e., thermal occupation of a few double-well quanta reduces the protocol performance by about 10%. Hence, we conclude that finite temperature is the main source of decoherence in such junctions and we demonstrate the possibility to entangle the condensate motion with the ion vibrational state.

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Critical slowdown of non-equilibrium polaron dynamics

Cited by 59 publications

References 53 publications

Many-body quantum dynamics and induced correlations of Bose polarons

Many-body quantum dynamics and induced correlations of Bose polarons

Dissipative correlated dynamics of a moving impurity immersed in a Bose–Einstein condensate

Compound atom-ion Josephson junction: Effects of finite temperature and ion motion

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