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arXiv 2403.19151cond-mat.quant-gas
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一维超固态中的声波与涨落

Sounds waves and fluctuations in one-dimensional supersolids

L. M. Platt, D. Baillie, P. B. Blakie

AI总结:

本文研究一维晶体结构稀薄超固态的低能激发,基于拉格朗日量建立广义弹性参数的流体力学描述,并通过Bogoliubov-de Gennes方程验证声速与涨落预测,揭示偶极BEC与软芯相互作用模型分别近似实现体不可压缩与刚性晶格超固态极限。

摘要:

我们研究具有一维晶体结构的稀薄超固态物质的低能激发。基于拉格朗日量发展了流体力学描述,结合了从基态计算推导出的广义弹性参数。通过比较两个无能隙带的声速、密度涨落和相位涨落,将流体力学理论的预测与Bogoliubov-de Gennes方程的解进行了验证。我们的结果针对两种不同的超固态模型给出:无限长管中的偶极Bose-Einstein凝聚体和具有软芯相互作用的稀薄原子Bose气体。识别了特征能量尺度,突显这两种模型分别近似实现了体不可压缩和刚性晶格超固态极限。

英文摘要:

We examine the low-energy excitations of a dilute supersolid state of matter with a one-dimensional crystal structure. A hydrodynamic description is developed based on a Lagrangian, incorporating generalized elastic parameters derived from ground state calculations. The predictions of the hydrodynamic theory are validated against solutions of the Bogoliubov-de Gennes equations, by comparing the speeds of sound, density fluctuations, and phase fluctuations of the two gapless bands. Our results are presented for two distinct supersolid models: a dipolar Bose-Einstein condensate in an infinite tube and a dilute Bose gas of atoms with soft-core interactions. Characteristic energy scales are identified, highlighting that these two models approximately realize the bulk incompressible and rigid lattice supersolid limits.

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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