Persistent currents in toroidal dipolar supersolids

Tengstrand, M. Nilsson; Boholm, David; Sachdeva, Rashi; Bengtsson, Jakob; Reimann, S. M.

doi:10.1103/physreva.103.013313

Cited by 40 publications

(22 citation statements)

References 81 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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“…This is an important prerequisite to study a key property of supersolids, the reduced superfluidity due to the crystal-like structure [4]. Our results can be extended directly to annular configurations, which are the ideal setup to study superfluidity [4,20,39] and would also allow to eliminate the longitudinal harmonic potential without the edge effects introduced by box-like potentials [40]. A sufficiently tight radial confinement will allow to achieve continuous phase transitions, in analogy with the 1D-like configurations we explored in this work.…”

Section: Discussionmentioning

confidence: 79%

Dimensional crossover in the superfluid-supersolid quantum phase transition

Biagioni¹,

Antolini²,

Alaña³

et al. 2021

Preprint

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We assess experimentally and theoretically the character of the superfluid-supersolid quantum phase transition recently discovered in trapped dipolar quantum gases. We find that one-row supersolids can have already two types of phase transitions, discontinuous and continuous, that are reminiscent of the first-and second-order transitions predicted in the thermodynamic limit in 2D and 1D, respectively. The smooth crossover between the two regimes is peculiar to supersolids and can be controlled via the transverse confinement and the atom number. We justify our observations on the general ground of the Landau theory of phase transitions. The quasi-adiabatic crossing of a continuous phase transition opens new directions of investigation for supersolids.

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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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Persistent currents in toroidal dipolar supersolids

Cited by 40 publications

References 81 publications

Two-Dimensional Supersolid Formation in Dipolar Condensates

Two-Dimensional Supersolid Formation in Dipolar Condensates

Dimensional crossover in the superfluid-supersolid quantum phase transition

Maintaining supersolidity in one and two dimensions

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