【摘 要】
：
Patterns resulted from modulation instability are ubiquitous and have been extensively studied in optics and Bose-Einstein con-densates.However,these patterns have not been realized in ultracold Fermi gases,although there has been considerable theo-retica
【机 构】
：
State Key Laboratory of Precision Spectroscopy,East China Normal University,Shanghai 200062,China;St
【出 处】
：
中国科学：物理学 力学 天文学（英文版）
论文部分内容阅读
Patterns resulted from modulation instability are ubiquitous and have been extensively studied in optics and Bose-Einstein con-densates.However,these patterns have not been realized in ultracold Fermi gases,although there has been considerable theo-retical interest in this field.Here we report an experimental observation of space-time patterns in a superfluid Fermi gas excited by red-detuned laser light.Longitudinal spatially fluctuated laser beams induce the spontaneous formation of two different kinds of patterns.For strongly interacting Fermi gas,the induced patterns accompanied by phonon excitations demonstrate a striking“X”-type dispersion relation between frequency and wavevector.Then,the propagation of such patterns in the Bose-Einstein condensate to Bardeen-Cooper-Schrieffer crossover is investigated,which is related to the speed of sound and agrees well with theoretical calculations.The observed patterns in noninteracting Fermi gases are stationary without phonon excitations and show a much longer lifetime.
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