Observation of a Lee-Huang-Yang Fluid.
Observation of a Lee-Huang-Yang Fluid.
复制标题
李黄阳流体的观察。
DOI：
10.1103/physrevlett.126.230404
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发表时间：
2020
影响因子：
8.6
通讯作者：
J. Arlt
中科院分区：
文献类型：
--
作者：
Thomas G. Skov;M. G. Skou;N. B. Jørgensen;J. Arlt
我们在玻色-爱因斯坦凝聚体的混合物中观察到单极子振荡，其中通常占主导地位的平均场相互作用被抵消。在这种情况下，系统由描述量子涨落效应的基态能量的下一阶Lee-Huang-Yang （LHY）校正控制。实验上，这种LHY流体是通过控制被限制在球形阱势中的^{39}K自旋混合物中的原子数和相互作用强度来实现的。我们测量单极振荡频率作为LHY相互作用强度的函数，该函数最近由jgensen等人提出。结果表明，该方法与包括激励过程和非弹性损失在内的完整实验的模拟结果非常吻合。物理学报，21,173403 (2018):PRLTAO0031-900710.1103/PhysRevLett.121.173403。这证实了系统及其集体行为最初是由LHY相互作用支配的。此外，单极子振荡频率在理想值附近的广泛区域内随散射长度的变化而稳定，证实了LHY相互作用的稳定作用。这些结果为在量子模拟实验中使用LHY项提供的非线性以及在LHY范围之外的研究铺平了道路。
We observe monopole oscillations in a mixture of Bose-Einstein condensates, where the usually dominant mean-field interactions are canceled. In this case, the system is governed by the next-order Lee-Huang-Yang (LHY) correction to the ground state energy, which describes the effect of quantum fluctuations. Experimentally such a LHY fluid is realized by controlling the atom numbers and interaction strengths in a ^{39}K spin mixture confined in a spherical trap potential. We measure the monopole oscillation frequency as a function of the LHY interaction strength as proposed recently by Jrgensen et al. [Phys. Rev. Lett. 121, 173403 (2018)PRLTAO0031-900710.1103/PhysRevLett.121.173403] and find excellent agreement with simulations of the complete experiment including the excitation procedure and inelastic losses. This confirms that the system and its collective behavior are initially dominated by LHY interactions. Moreover, the monopole oscillation frequency is found to be stable against variations of the involved scattering lengths in a broad region around the ideal values, confirming the stabilizing effect of the LHY interaction. These results pave the way for using the nonlinearity provided by the LHY term in quantum simulation experiments and for investigations beyond the LHY regime.