Supersolid symmetry breaking from compressional oscillations in a dipolar quantum gas

@article{Tanzi2019SupersolidSB,
  title={Supersolid symmetry breaking from compressional oscillations in a dipolar quantum gas},
  author={L. Tanzi and Santo Maria Roccuzzo and Eleonora Lucioni and F. Fam{\`a} and A. Fioretti and C. Gabbanini and Giovanni Modugno and Alessio Recati and Sandro Stringari},
  journal={Nature},
  year={2019},
  volume={574},
  pages={382-385}
}
Supersolids are exotic materials combining the frictionless flow of a superfluid with the crystal-like periodic density modulation of a solid. The supersolid phase of matter was predicted 50 years ago1–3 for solid helium4–8. Ultracold quantum gases have recently been made to exhibit periodic order typical of a crystal, owing to various types of controllable interaction9–13. A crucial feature of a D-dimensional supersolid is the occurrence of D + 1 gapless excitations, reflecting the Goldstone… Expand
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. Expand
Rotating a Supersolid Dipolar Gas.
TLDR
The moment of inertia of a harmonically trapped dipolar Bose-Einstein condensed gas is calculated as a function of the tunable scattering length parameter, providing the transition from the (fully) superfluid to the supersolid phase and eventually to an incoherent crystal of self-bound droplets. Expand
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. Expand
Supersolid phase of a spin-orbit-coupled Bose-Einstein condensate: A perturbation approach
The phase diagram of a Bose-Einstein condensate with Raman-induced spin-orbit coupling includes a stripe phase with supersolid features. In this work we develop a perturbation approach to study theExpand
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 beenExpand
Exciting the Goldstone Modes of a Supersolid Spin-Orbit-Coupled Bose Gas.
TLDR
This work proposes accessible signatures of Goldstone modes in harmonically trapped spin-orbit-coupled Bose-Einstein condensates, where supersolidity appears in the form of stripes and provides evidence for the Goldstone mode associated with the translational motion of stripes. Expand
Two-dimensional supersolidity in a circular trap
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 rotonExpand
Exact relations for dipolar quantum gases
We establish that two-dimensional dipolar quantum gases admit a universal description, i.e., their thermodynamic properties are independent of details of the interaction at short distances. The onlyExpand
Spontaneous Formation of Star-Shaped Surface Patterns in a Driven Bose-Einstein Condensate.
TLDR
This work opens a new pathway for generating higher-lying collective excitations with applications, such as the probing of exotic properties of quantum fluids and providing a generation mechanism of quantum turbulence. Expand
Supersolid phase of the extended Bose-Hubbard model with an artificial gauge field
We examine the zero and finite temperature phase diagram of the extended Bose-Hubbard model on a square optical lattice. To study various quantum phases and their transitions we employ single-siteExpand
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 57 REFERENCES
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. Expand
Supersolid formation in a quantum gas breaking a continuous translational symmetry
TLDR
The realization of a supersolid with continuous translational symmetry breaking along one direction in a quantum gas is reported, providing a route to creating and studying glassy many-body systems with controllably lifted ground-state degeneracies, such as supersolids in the presence of disorder. Expand
Supersolid behavior of a dipolar Bose-Einstein condensate confined in a tube
Motivated by a recent experiment [L. Chomaz et al., Nat. Phys. 14, 442 (2018)], we perform numerical simulations of a dipolar Bose-Einstein condensate (BEC) in a tubular, periodic confinement atExpand
Observing the Rosensweig instability of a quantum ferrofluid
TLDR
This work uses in situ imaging to directly observe the spontaneous transition from an unstructured superfluid to an ordered arrangement of droplets in an atomic dysprosium Bose–Einstein condensate and shows spontaneous translational symmetry breaking. Expand
A stripe phase with supersolid properties in spin–orbit-coupled Bose–Einstein condensates
TLDR
This work establishes a system with continuous symmetry-breaking properties, associated collective excitations and superfluid behaviour, and observes the predicted density modulation of this stripe phase using Bragg reflection while maintaining a sharp momentum distribution. Expand
Excitation Spectrum of a Trapped Dipolar Supersolid and Its Experimental Evidence.
TLDR
Theoretically, it is shown that, when entering the supersolid phase, two distinct excitation branches appear, respectively associated with dominantly crystal and superfluid excitations, and these results confirm infinite-system predictions, showing that finite-size effects play only a small qualitative role. Expand
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. Expand
Collective excitations and supersolid behavior of bosonic atoms inside two crossed optical cavities
We discuss the nature of symmetry breaking and the associated collective excitations for a system of bosons coupled to the electromagnetic field of two optical cavities. For the specificExpand
Monitoring and manipulating Higgs and Goldstone modes in a supersolid quantum gas
TLDR
This work directly studied Higgs and Goldstone modes in a supersolid quantum gas created by coupling a Bose-Einstein condensate to two optical cavities, whose field amplitudes form the real and imaginary parts of a U(1)-symmetric order parameter. Expand
Supersolid structure and excitation spectrum of soft-core bosons in three dimensions
CNR-IOM Democritos, via Bonomea, 265 - 34136 Trieste, Italy(Dated: September 12, 2013)By means of a mean-field method, we have studied the zero temperature structure and excitationspectrum of aExpand
...
1
2
3
4
5
...