Compressibility and speeds of sound across the superfluid to supersolid phase transition of an elongated dipolar gas
arXiv:2306.04794 · doi:10.1103/PhysRevResearch.5.033161
Abstract
We investigate the excitation spectrum and compressibility of a dipolar Bose-Einstein condensate in an infinite tube potential in the parameter regime where the transition between superfluid and supersolid phases occurs. Our study focuses on the density range in which crystalline order develops continuously across the transition. Above the transition the superfluid shows a single gapless excitation band, phononic at small momenta and with a roton at a finite momentum. Below the transition, two gapless excitations branches (three at the transition point) emerge in the supersolid. We examine the two gapless excitation bands and their associated speeds of sound in the supersolid phase. Our results show that the speeds of sound and the compressibility are discontinuous at the transition, indicating a second-order phase transition. These results provide valuable insights into the identification of supersolid phenomena in dipolar quantum gases and the relationship to supersolidity in spin-orbit coupled gases.
9 pages, 4 figures
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Cited by in corpus (13)
- Sound, superfluidity and layer compressibility in a ring dipolar supersolid
- Decoupled sound and amplitude modes in trapped dipolar supersolids
- Excitations of a binary dipolar supersolid
- Sounds waves and fluctuations in one-dimensional supersolids
- Observation of supersolid-like sound modes in a driven quantum gas
- Supersolid spectroscopy
- Kibble-Zurek scaling of the superfluid-supersolid transition in an elongated dipolar gas
- Honeycomb supersolid -- Dirac points and shear-instability induced crystal transitions
- From elastic to inelastic deformation of a dipolar supersolid
- Localized States in Dipolar Bose-Einstein Condensates: To be or not to be of second order
- Dynamical signatures of superfluidity and shear rigidity in different phases of a dipolar Bose-Einstein condensate
- Strongly dipolar molecular Bose-Einstein condensates: From few- to many-body physics
- Excitations and anisotropic sound in planar dipolar supersolids with tilted dipoles