期刊
SCIENCE
卷 353, 期 6297, 页码 371-374出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aaf0666
关键词
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资金
- National Natural Science Foundation of China (NSFC) [11374101, 91536112]
- Shu Guang project of Shanghai Municipal Education Commission [14SG22]
- Shanghai Education Development Foundation
- MOST [2016YFA0301604]
- Tsinghua University Initiative Scientific Research Program
- NSFC [11325418]
- Fundamental Research Funds for the Central Universities
- Renmin University of China [15XNLF18, 16XNLQ03]
Scale invariance plays an important role in unitary Fermi gases. Discrete scaling symmetry manifests itself in quantum few-body systems such as the Efimov effect. Here, we report on the theoretical prediction and experimental observation of a distinct type of expansion dynamics for scale-invariant quantum gases. When the frequency of the harmonic trap holding the gas decreases continuously as the inverse of time t, the expansion of the cloud size exhibits a sequence of plateaus. The locations of these plateaus obey a discrete geometric scaling law with a controllable scale factor, and the expansion dynamics is governed by a log-periodic function. This marked expansion shares the same scaling law and mathematical description as the Efimov effect.
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