Dynamics of equilibration and collisions in ultradilute quantum droplets

Cikojević, Viktor; Markić, Leandra Vranješ; Pí, M.; Barranco, M.; Ancilotto, Francesco; Boronat, J.

doi:10.1103/physrevresearch.3.043139

Cited by 18 publications

(12 citation statements)

References 45 publications

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“…Similar results for homo-nuclear droplets are described in Ref. [29]. Now, we can explore the multipole character of the collective excitations of the droplets as characterized in terms of the evolution over time of the multipole moment of the density of the atoms,…”

Section: B Three-body Scattering Effectssupporting

confidence: 67%

Weber number and the outcome of binary collisions between quantum droplets

Alba-Arroyo¹,

Caballero-Benítez²,

Jauregui³

2022

Preprint

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Section: B Three-body Scattering Effectssupporting

confidence: 67%

Weber number and the outcome of binary collisions between quantum droplets

Alba-Arroyo¹,

Caballero-Benítez²,

Jauregui³

2022

Preprint

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“…What makes protrusions unique in the case of 4 He droplets is that they act as nucleation sites of quantized vortex rings. Surface protrusions have also been identified in head-on collisions of self-bound quantum droplets [13,35], but no vortex ring nucleation has been reported in these studies. For these droplets made of ultradilute Bose-gase mixtures, a minimum number of atoms is needed to develop any binding, and the surface tension is very small.…”

Section: A Merging Dynamicsmentioning

confidence: 89%

“…With the experimental realization of stable self-bound ultradilute "quantum droplets" made of bosonic atoms of a binary mixture [73], which have been found to sustain quantum vortices [74], it has been possible to study the collision of self-bound BECs [13,35]. Thus it should also be possible to study the merging of quantum droplets and the influence of surface effects in the transfer of angular momentum from one quantum droplet to another, as well as a deeper analysis of the role of the surface protrusions as potential nucleation sites of vortex rings, thus connecting the ultradilute quantum droplet BECs and the superfluid 4 He droplets scenarios.…”

Section: Discussionmentioning

confidence: 99%

Merging of superfluid helium nanodroplets with vortices

et al. 2022

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Within density functional theory, we have investigated the coalescence dynamics of two superfluid helium nanodroplets hosting vortex lines in different relative orientations, which are drawn towards each other by the Van der Waals mutual attraction. We have found a rich phenomenology depending on how the vortex lines are oriented. In particular, when a vortex and antivortex lines are present in the merging droplets, a dark soliton develops at the droplet contact region, which eventually decays into vortex rings. Reconnection events are observed between the vortex lines or rings, leading to the creation of more vortices. Our simulations show the interplay between vortex creation and reconnections, as well as the effect of the droplet surface which pins the vortex ends and, by reflecting short-wavelength excitations produced by the interactions between vortices, strongly affects the droplet final state. Additional vorticity is nucleated in the proximity of surface indentations produced in the course of the dynamics, which in turn interact with other vortices present in the droplets. These effects, obviously absent in the case of bulk liquid helium, show that the droplet surface may act as a multiplier of vortex reconnections. The analysis of the energy spectrum shows that vortex-antivortex ring annihilation, as well as vortex-antivortex reconnections, yields roton bursts of different intensity.

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“…Longer lifetimes would permit precise studies of the droplets properties and more generally of the beyondmean-field effects in Bose gases. Effects beyond the standard Lee-Huang-Yang energy used in our work will appear, either because of higher order terms in the density expansion [27], because of finite-range interacting potentials [28,29], or because of temperature effects [30]…”

Section: Discussionmentioning

confidence: 99%

1D to 3D beyond-mean-field dimensional crossover in mixture quantum droplets

Lavoine,

Bourdel

2020

Preprint

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The existence of quantum droplets in binary Bose-Einstein condensate mixtures rely on beyondmean field effects, competing with mean-field effects. Interestingly, the beyond-mean field effect is changing from repulsive in 3D to attractive in 1D leading to drastically different behaviors. We study in detail the crossover between these two regimes in a quasi-1D regime where the radial wavefunction is frozen. Quantum droplets exist for all values and sign of the mean-field interaction. We find that approaching the crossover is experimentally appealing as it reduces the relative importance of three-body losses and give realistic numbers for the realization of quantum droplet in the crossover, which would permit to test beyond-mean-field theories to an unprecedented precision.

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Dynamics of equilibration and collisions in ultradilute quantum droplets

Cited by 18 publications

References 45 publications

Weber number and the outcome of binary collisions between quantum droplets

Weber number and the outcome of binary collisions between quantum droplets

Merging of superfluid helium nanodroplets with vortices

1D to 3D beyond-mean-field dimensional crossover in mixture quantum droplets

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