QUANTUM GASES Two- and three-body contacts in the unitary Bose gas
QUANTUM GASES Two- and three-body contacts in the unitary Bose gas
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DOI：
10.1126/science.aai8195
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发表时间：
2017-01-27
期刊：
影响因子：
56.9
通讯作者：
Hadzibabic, Zoran
中科院分区：
文献类型：
--
作者：
Fletcher, Richard J.;Lopes, Raphael;Hadzibabic, Zoran
在由成对接触相互作用控制的多体系统中，广泛的可观测量由一个单一的参数联系起来，即两体接触，它量化了两个粒子的相关性。这种深刻的见解改变了我们对强相互作用费米气体的理解。使用拉姆齐干涉，我们研究了共振相互作用玻色气体的相干演化，我们在这里表明，它不能解释只有成对的相关性。我们的实验揭示了由Efimov物理学产生的三体关联的关键作用，并提供了相关的三体接触的直接测量。
In many-body systems governed by pairwise contact interactions, a wide range of observables is linked by a single parameter, the two-body contact, which quantifies two-particle correlations. This profound insight has transformed our understanding of strongly interacting Fermi gases. Using Ramsey interferometry, we studied coherent evolution of the resonantly interacting Bose gas, and we show here that it cannot be explained by only pairwise correlations. Our experiments reveal the crucial role of three-body correlations arising from Efimov physics and provide a direct measurement of the associated three- body contact.