Supersolidity in Two-Dimensional Trapped Dipolar Droplet Arrays.

@article{Hertkorn2021SupersolidityIT,
  title={Supersolidity in Two-Dimensional Trapped Dipolar Droplet Arrays.},
  author={Jens Hertkorn and J.-N. Schmidt and Mei Guo and F. B{\"o}ttcher and K. S. H. Ng and S. D. Graham and Peter Uerlings and Hans Peter B{\"u}chler and Tim Langen and Martin W. Zwierlein and Tilman Pfau},
  journal={Physical review letters},
  year={2021},
  volume={127 15},
  pages={
          155301
        }
}
We theoretically investigate the ground states and the spectrum of elementary excitations across the superfluid to droplet crystallization transition of an oblate dipolar Bose-Einstein condensate. We systematically identify regimes where spontaneous rotational symmetry breaking leads to the emergence of a supersolid phase with characteristic collective excitations, such as the Higgs amplitude mode. Furthermore, we study the dynamics across the transition and show how these supersolids can be… 

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References

SHOWING 1-10 OF 94 REFERENCES
Patterned Supersolids in Dipolar Bose Systems
We study by means of first principle Quantum Monte Carlo simulations the ground state phase diagram of a system of dipolar bosons with aligned dipole moments, and with the inclusion of a two-body
New states of matter with fine-tuned interactions: quantum droplets and dipolar supersolids.
TLDR
The fine-tuning of the interatomic interactions can lead to the emergence of two new states of matter: liquid-like selfbound quantum droplets and supersolid crystals formed from these droplets.
The low-energy Goldstone mode in a trapped dipolar supersolid
TLDR
Observation of the collective mode responding to the superfluid stiffness—the low-energy Goldstone mode—provides direct evidence for phase rigidity, which is a key signature of supersolidity in an ultracold quantum gas.
Variational theory for the ground state and collective excitations of an elongated dipolar condensate
We develop a variational theory for a dipolar condensate in an elongated (cigar shaped) confinement potential. Our formulation provides an effective one-dimensional extended meanfield theory for the
Supersolid symmetry breaking from compressional oscillations in a dipolar quantum gas
TLDR
This work demonstrates the breaking of two symmetries owing to the coexisting superfluid and crystal properties of a supersolid, and suggests the presence of two separate quantum phase transitions between the superfluid, supersolid and solid-like configurations.
Defect-induced supersolidity with soft-core bosons
TLDR
For low particle densities, the system is shown to feature a solid phase in which zero-point vacancies emerge spontaneously and give rise to superfluid flow of particles through the crystal, the first example of defect-induced, continuous-space supersolidity consistent with the Andreev–Lifshitz–Chester scenario.
Phase coherence in out-of-equilibrium supersolid states of ultracold dipolar atoms
A supersolid is a counterintuitive phase of matter that combines the global phase coherence of a superfluid with a crystal-like self-modulation in space. Recently, such states have been
Two-dimensional supersolidity in a dipolar quantum gas.
TLDR
The extension of supersolid properties into two dimensions is demonstrated by preparing a supersolid quantum gas of dysprosium atoms on both sides of a structural phase transition similar to those occurring in ionic chains17-20, quantum wires21,22 and theoretically in chains of individual dipolar particles.
Observation of Roton Mode Population in a Dipolar Quantum Gas
TLDR
Experimental and theoretical studies of the momentum distribution in Bose–Einstein condensates of highly magnetic erbium atoms reveal the existence of the long-sought roton mode, providing a further step in the quest towards supersolidity in dipolar quantum gases.
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