Phases of dipolar bosons in a bilayer geometry

Cinti, Fabio; Wang, Daw-Wei

doi:10.1103/physreva.95.023622

Cited by 26 publications

(28 citation statements)

References 47 publications

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“…As the density is increased, the potential energy starts to dominate and a triangular crystal is formed. For large separation between layers, two independent atomic crystals are formed and the phase transition occurs when the density per layer reaches the same critical value as in a single-layer geometry, n A r 2 0 = n B r 2 0 ≈ 290 [142,145]. In the limit of small interlayer separations, a single molecular crystal is formed at the density nr 2 0 ≈ 9.…”

Section: Phase Diagrammentioning

confidence: 99%

“…(7.1) we anticipate to find three phases: atomic gas, solid, and gas of chains. This comes from considering previous studies in a dipolar layer [30,31] and bilayer [32,33,145].…”

Section: The Hamiltonianmentioning

confidence: 99%

“…[32,33] using exact quantum Monte Carlo simulations. Furthermore, when the interlayer distance approaches to zero the system forms a molecular crystal and for large values of the interlayer distance an independent atomic crystal is formed in each layer [145].…”

Section: Introductionmentioning

confidence: 99%

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Few-body bound states of two-dimensional bosons

Guijarro¹,

Astrakharchik²,

Boronat³

et al. 2020

Phys. Rev. A

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We study clusters of the type AN BM with N ≤ M ≤ 3 in a two-dimensional mixture of A and B bosons, with attractive AB and equally repulsive AA and BB interactions. In order to check universal aspects of the problem, we choose two very different models: dipolar bosons in a bilayer geometry and particles interacting via separable Gaussian potentials. We find that all the considered clusters are bound and that their energies are universal functions of the scattering lengths aAB and aAA = aBB, for sufficiently large attraction-to-repulsion ratios aAB/aBB. When aAB/aBB decreases below ≈ 10, the dimer-dimer interaction changes from attractive to repulsive and the populationbalanced AABB and AAABBB clusters break into AB dimers. Calculating the AAABBB hexamer energy just below this threshold, we find an effective three-dimer repulsion which may have important implications for the many-body problem, particularly for observing liquid and supersolid states of dipolar dimers in the bilayer geometry. The population-imbalanced ABB trimer, ABBB tetramer, and AABBB pentamer remain bound beyond the dimer-dimer threshold. In the dipolar model, they break up at aAB ≈ 2aBB where the atom-dimer interaction switches to repulsion.

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Section: Phase Diagrammentioning

confidence: 99%

“…(7.1) we anticipate to find three phases: atomic gas, solid, and gas of chains. This comes from considering previous studies in a dipolar layer [30,31] and bilayer [32,33,145].…”

Section: The Hamiltonianmentioning

confidence: 99%

See 1 more Smart Citation

Few-body bound states of two-dimensional bosons

Guijarro¹,

Astrakharchik²,

Boronat³

et al. 2020

Phys. Rev. A

View full text Add to dashboard Cite

show abstract

“…As the density of the liquid is increased, the potential energy starts to dominate and eventually a triangular crystal is formed. For large separation between layers, two independent atomic crystals are formed and the phase transition occurs when the density per layer reaches the same critical value as in a single-layer geometry, nr 2 0 ≈ 290 [17,22]. In the limit of small interlayer separations, a single molecular crystal is formed at density nr 2 0 ≈ 9.…”

mentioning

confidence: 99%

Ultradilute Quantum Liquid of Dipolar Atoms in a Bilayer

2022

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“…Quantum gases with dipolar interaction are also explored with cold atoms. In these systems, dipolar interactions lead to droplet structures with spatial ordering and coherence [36][37][38][39][40], few-body complexes [41,42], and pair superfluid and crystal phases in bilayers of dipoles [43][44][45][46].…”

mentioning

confidence: 99%

Attractive and repulsive dipolar interaction in bilayers of indirect excitons

Choksy,

Xu,

Fogler

et al. 2020

Preprint

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We explore attractive dipolar interaction in indirect excitons (IXs). For one layer of IXs in a single pair of coupled quantum wells (CQW), the out-of-plane IX electric dipoles lead to repulsive dipolar interaction between IXs. The attractive dipolar interaction between IXs is realized in a 2-CQW heterostructure with two IX layers in two separated CQW pairs. We found both in experimental measurements and theoretical simulations that increasing density of IXs in one layer causes a monotonic energy reduction for IXs in the other layer. We also found an in-plane shift of a cloud of IXs in one layer towards a cloud of IXs in the other layer. This behaviour is qualitatively consistent with attractive dipolar interaction. The measured IX energy reduction and IX cloud shift are higher than the values given by the correlated liquid theory.

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Phases of dipolar bosons in a bilayer geometry

Cited by 26 publications

References 47 publications

Few-body bound states of two-dimensional bosons

Few-body bound states of two-dimensional bosons

Ultradilute Quantum Liquid of Dipolar Atoms in a Bilayer

Attractive and repulsive dipolar interaction in bilayers of indirect excitons

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