Supersolid structure and excitation spectrum of soft-core bosons in 3D

Abstract

By means of a mean-field method, we have studied the zero temperature structure and excitation spectrum of a three-dimensional soft-core bosonic system for a value of the interaction strength that favors a crystal structure made of atomic nano-clusters arranged with FCC ordering. In addition to the longitudinal and transverse phonon branches expected for a normal crystal, the excitation spectrum shows a soft mode related to the breaking of gauge symmetry, which signals a partial superfluid character of the solid. Additional evidence of supersolidity is provided by the calculation of the superfluid fraction, which shows a first-order drop, from 1 to 0.4, at the liquid-supersolid transition and a monotonic decrease as the interaction strength parameter is increased. The conditions for the coexistence of the supersolid with the homogeneous superfluid are discussed, and the surface tension of a representative solid-liquid interface is calculated.

11 pages, 11 figures

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Cited by in corpus (30)

• Long-range interacting quantum systems
• Supersolid symmetry breaking from compressional oscillations in a dipolar quantum gas
• Supersolid behaviour of a dipolar Bose-Einstein condensate confined in a tube
• Rotating a supersolid dipolar gas
• Supersolidity in an elongated dipolar condensate
• Supersolidity in ultra-cold dipolar gases
• Ground state of weakly repulsive soft-core bosons on a sphere
• Supersolid edge and bulk phases of a dipolar quantum gas in a box
• Two-dimensional supersolidity in a planar dipolar Bose gas
• Ground state and excitation properties of soft-core bosons
• Spin-orbit-coupling-assisted roton softening and superstripes in a Rydberg-dressed Bose-Einstein Condensate
• Sound, superfluidity and layer compressibility in a ring dipolar supersolid
• Supersolid phases of bosonic particles in a bubble trap
• Freezing of soft-core bosons at zero temperature: A variational theory
• Quantum Critical Behavior of One-Dimensional Soft Bosons in the Continuum
• Compressibility and speeds of sound across the superfluid to supersolid phase transition of an elongated dipolar gas
• Exploring quantum quasicrystal patterns: a variational study
• Sounds waves and fluctuations in one-dimensional supersolids
• Tuneable defect interactions and supersolidity in dipolar quantum gases on a lattice potential
• Dipolar Bose gas in highly anharmonic traps
• Quasiparticle spectra of supersolid lattice gases at near-resonant Rydberg-dressing
• Quantum crystallography of Rydberg-dressed Bose gases on a square lattice
• Kohn-Sham approach to Fermi gas superfluidity: the bilayer of fermionic polar molecules
• Effect of finite range interactions on roton mode softening in a multi-component BEC
• Ground state phase diagram of ultrasoft bosons
• Static density response of one-dimensional soft bosons across the clustering transition
• Evolution of static and dynamical density correlations in a one-dimensional soft-core gas from the Tonks-Girardeau limit to a clustering fluid
• Localized States in Dipolar Bose-Einstein Condensates: To be or not to be of second order
• Soliton lattices in the Gross-Pitaevskii equation with nonlocal and repulsive coupling
• Positive-density ground states of the Gross-Pitaevskii equation