| Phonon Stability of Quantum Droplets in Dipolar Bose Gases |
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| 作者姓名： | 张帆 尹澜 |
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| 作者单位： | School of Physics, Peking University |
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| 摘 要： | Stabilized by quantum fluctuations, dipolar Bose–Einstein condensates can form self-bound liquid-like droplets.However in the Bogoliubov theory, there are imaginary phonon energies 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 Gu Q and Yin L 2020 Phys.Rev. B 102 220503(R)]. We study the excitation energy of a...
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