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arXiv 2109.03599cond-mat.quant-gas
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偶极玻色气体中量子滴的声子稳定性

Phonon Stability of Quantum Droplets in a dipolar Bose gases

Fan Zhang, Lan Yin

摘要:

偶极玻色-爱因斯坦凝聚体在平均场不稳定区域中,由于量子涨落的作用,可以形成自束缚的类液滴。然而,在Bogoliubov理论中,一些声子能量在长波长极限是虚的,这意味着该系统的动力学不稳定性。类似的不稳定性出现在二元量子液滴的Bogoliubov理论中,并且由于最近显示的高阶量子涨落而被消除[1]。在这篇工作中,我们在Beliaev形式下研究了偶极量子液滴的声子能量,发现量子涨落可以增强声子的稳定性。我们得到了各向异性的声速,可以在实验中测试。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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