Vortex properties in the extended supersolid phase of dipolar Bose-Einstein condensates

Ancilotto, Francesco; Barranco, M.; Pí, M.; Reatto, L.

doi:10.1103/physreva.103.033314

Cited by 42 publications

(33 citation statements)

References 65 publications

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“…A more recent experiment has created the first states with two-dimensional (2D) supersolidity in anisotropic traps of variable aspect ratio [16]. This opens the door to study vortices and persistent currents [17][18][19][20], as well as exotic ground state phases predicted for large atom numbers [21][22][23][24].…”

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confidence: 99%

Two-Dimensional Supersolid Formation in Dipolar Condensates

Bland,

Poli,

Politi

et al. 2021

Preprint

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Dipolar condensates have recently been coaxed into supersolid phases supporting both superfluid and crystal excitations. While one-dimensional (1D) supersolids may be prepared via a roton instability, we find that such a procedure in two dimensions (2D) leads to greater heating. We go on to show that 2D roton modes have little in common with the supersolid configuration: instead, unstable centralized rotons trigger a process of nonlinear crystal growth. By evaporatively cooling directly into the supersolid phase-hence bypassing the first-order roton instability-we experimentally produce a 2D supersolid in a near-circular trap. We develop a stochastic Gross-Pitaevskii theory that includes beyond-meanfield effects to further explore the formation process. We calculate the static structure factor for a 2D supersolid, and compare to a 1D array. These results provide insight into the process of supersolid formation in 2D, and define a realistic path to the formation of large two-dimensional supersolid arrays.

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confidence: 99%

Two-Dimensional Supersolid Formation in Dipolar Condensates

Bland,

Poli,

Politi

et al. 2021

Preprint

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“…Following the demonstration of 1D supersolidity in dipolar gases, its two dimensional (2D) counterpart is currently attracting substantial renewed interest. Theoretically, recent studies have focused on the phase diagram and excitation spectra of 2D supersolid in isotropic and anisotropic traps [133][134][135], the possibility of such supersolids hosting vortices in the low-density regions [136][137][138], and on the formation of novel type of ground-states with exotic spatial patterns [133,139]. Very recently, supersolidity along two dimensions has been demonstrated in a trap of variable anisotropy [135].…”

Section: Consequences Of Large Magnetic Moment In Bec: Roton Droplets...mentioning

confidence: 99%

New opportunites for interactions and control with ultracold lanthanides

Norcia,

Ferlaino

2021

Preprint

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Lanthanide atoms have an unusual electron configuration, with a partially filled shell of f orbitals. This leads to a set of characteristic properties that enable enhanced control over ultracold atoms and their interactions: large numbers of optical transitions with widely varying wavelengths and transition strengths, anisotropic interaction properties between atoms and with light, and a large magnetic moment and spin space present in the ground state. These features in turn enable applications ranging from narrow-line laser cooling and spin manipulation to evaporative cooling through universal dipolar scattering, to the observation of a rotonic dispersion relation, self-bound liquid-like droplets stabilized by quantum fluctuations, and supersolid states. In this short review, we describe how the unusual level structure of lanthanide atoms leads to these key features, and provide a brief and necessarily partial overview of experimental progress in this rapidly developing field.

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“…An early theoretical study in 2D predicted a rich phase diagram determined by competing metastable crystal configurations [31]. More recent works in 2D have predicted supersolid edge phases [32]; intriguing manifestations of quantum vortices and persistent currents [33][34][35][36]; honeycomb supersolids [37]; as well as ring and stripe phases [38,39].…”

Section: Introductionmentioning

confidence: 99%

Maintaining supersolidity in one and two dimensions

Poli,

Bland,

Politi

et al. 2021

Preprint

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We theoretically investigate supersolidity in three-dimensional dipolar Bose-Einstein condensates. We focus on the role of trap geometry in determining the dimensionality of the resulting droplet arrays, which range from one-dimensional to zigzag, through to two-dimensional supersolids in circular traps. Supersolidity is well established in one-dimensional arrays, and may be just as favorable in two-dimensional arrays provided that one appropriately scales the atom number to the trap volume. We develop a tractable variational model-which we benchmark against full numerical simulations-and use it to study droplet crystals and their excitations. We also outline how exotic ring and stripe states may be created with experimentally-feasible parameters. Our work paves the way for future studies of two-dimensional dipolar supersolids in realistic settings.

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Vortex properties in the extended supersolid phase of dipolar Bose-Einstein condensates

Cited by 42 publications

References 65 publications

Two-Dimensional Supersolid Formation in Dipolar Condensates

Two-Dimensional Supersolid Formation in Dipolar Condensates

New opportunites for interactions and control with ultracold lanthanides

Maintaining supersolidity in one and two dimensions

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