Exotic vortex lattices in a rotating binary dipolar Bose-Einstein condensate

Zhang, Xiaofei; Wen, Lin; Dai, Cai-Qing; Dong, Ruifang; Jiang, Haifeng; Chang, Hong; Zhang, Shougang

doi:10.1038/srep19380

“…One term is perpendicular, with the other parallel to the direction of the dipole inclinations, as described in Refs. [7,8]. By generalizing the description to a polarization field rotating in the (x, y) plane, the two terms can be combined according to the dipole orientations ϕ, with the total 2D momentum-space DDI given by [12]…”

Section: A Model Formalismmentioning

confidence: 99%

Dipolar condensed atomic mixtures and miscibility under rotation

Tomio

¹

,

Kumar

²

,

Gammal

³

2020

SciPost Phys. Proc.

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By considering symmetric and asymmetric dipolar coupled mixtures (with dysprosium and erbium isotopes), we report a study on relevant anisotropic effects, related to spatial separation and miscibility, due to dipole-dipole interactions (DDIs) in rotating binary dipolar Bose-Einstein condensates. The binary mixtures are kept in strong pancake-like traps, with repulsive two-body interactions modeled by an effective two-dimensional (2D) coupled Gross-Pitaevskii equation. The DDI are tuned from repulsive to attractive by varying the dipole polarization angle. A clear spatial separation is verified in the densities for attractive DDIs, being angular for symmetric mixtures and radial for asymmetric ones. Also relevant is the mass-imbalance sensibility observed by the vortex-patterns in symmetric and asymmetric-dipolar mixtures. In an extension of this study, here we show how the rotational properties and spatial separation of these dipolar mixture are affected by a quartic term added to the harmonic trap of one of the components.

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“…One term is perpendicular, with the other parallel to the direction of the dipole inclinations, as described in Refs. [7,8]. By generalizing the description to a polarization field rotating in the (x, y) plane, the two terms can be combined according to the dipole orientations ϕ, with the total 2D momentum-space DDI given by [12]…”

Section: Model Formalism Parametrization and Numerical Approach 21 mentioning

confidence: 99%

Report on scipost_201911_00021v1

2019

0

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By considering symmetric and asymmetric dipolar coupled mixtures (with dysprosium and erbium isotopes), we report a study on relevant anisotropic effects, related to spatial separation and miscibility, due to dipole-dipole interactions (DDIs) in rotating binary dipolar Bose-Einstein condensates. The binary mixtures are kept in strong pancake-like traps, with repulsive two-body interactions modeled by an effective two-dimensional (2D) coupled Gross-Pitaevskii equation. The DDI are tuned from repulsive to attractive by varying the dipole polarization angle. A clear spatial separation is verified in the densities for attractive DDIs, being angular for symmetric mixtures and radial for asymmetric ones. Also relevant is the mass-imbalance sensibility observed by the vortexpatterns in symmetric and asymmetric-dipolar mixtures. In an extension of this study, here we show how the rotational properties and spatial separation of these dipolar mixture are affected by a quartic term added to the harmonic trap of one of the components. Contents 1 Dipolar Bose-Einstein condensate-Introduction 2 2 Model formalism, parametrization and numerical approach 3 2.1 Model formalism 3 2.2 Parametrization and numerical approach 4 3 Symmetric and asymmetric dipolar mixtures-Results 4 3.1 Dipolar mixtures confined by identical harmonic pancake-like traps 4 3.2 Dipolar symmetric 164 Dy-162 Dy mixture, with a quartic trap applied to 164 Dy 5 3.3 Dipolar asymmetric 168 Er-164 Dy mixture, with a quartic trap applied to 168 Er 6

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“…Dipolar mixtures with antiparallel dipoles have also been predicted to display finger instabilities in the immiscible phase [27], while rotating dipolar mixtures may exhibit exotic vortex lattices [28][29][30], including half-quantum vortex molecules [31]. The interplay of rotation and the miscible-immiscible transition has been theoretically studied by either adjusting the direction of dipole polarization [32], or by tuning the dipoledipole interaction coefficient [33,34], a technique that was recently demonstrated in experiments [35].…”

Section: Introductionmentioning

confidence: 99%

Miscibility and stability of dipolar bosonic mixtures

Lee,

Baillie,

Blakie

et al. 2021

Preprint

0

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Combining two Bose-Einstein condensates (BECs) may result in a miscible or immiscible mixture, or even a violent implosion. We theoretically demonstrate that dipolar two-component BECs produce far richer physics than their nondipolar counterparts. Intriguingly, when both components have equivalent dipoles, the transition to immiscibility is largely unaffected by dipolar physics, yet the dipoles maximally affect stability. Conversely, antiparallel dipoles strongly affect miscibility but have little effect on stability. By performing three-dimensional calculations of the ground states and their excitations, we find strong dependencies on the confinement geometry. We explore and elucidate the various phononic and rotonic phase transitions, as well as symmetry preserving crossovers.

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Exotic vortex lattices in a rotating binary dipolar Bose-Einstein condensate

Cited by 25 publications

References 62 publications

Dipolar condensed atomic mixtures and miscibility under rotation

Dipolar condensed atomic mixtures and miscibility under rotation

Report on scipost_201911_00021v1

Miscibility and stability of dipolar bosonic mixtures

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