Phonon Stability of Quantum Droplets in a dipolar Bose gases
arXiv:2109.03599 · doi:10.1088/0256-307X/39/6/060301
Abstract
Stabilized by quantum fluctuations, dipolar Bose-Einstein condensates can form self-bound liquidlike droplets in the mean-field unstable regime. However in the Bogoliubov theory, some phonon energies are imaginary in the long-wavelength limit, implying dynamical instability of this system. A similar instability appears in the Bogoliubov theory of a binary quantum droplet, and is removed due to higher-order quantum fluctuations as shown recently [1]. In this work, we study the phonon energy of a dipolar quantum droplet in the Beliaev formalism, and find that quantum fluctuations can enhance the phonon stability. We obtain the anisotropic sound velocity which can be tested in experiment.
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- Strongly anisotropic vortices in dipolar quantum droplets
- Two-dimensional quantum droplets in binary quadrupolar condensates
- Hydrodynamics of multi-component Bosonic systems
- A quantum Monte Carlo based density functional for Dysprosium dipolar system
- Stability of dipolar bosons in a quasiperiodic potential
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