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[理论室学术报告] Route to observing Fulde-Ferrell superfluids via a dark-state control of Feshbach resonances
时间: 2017年07月11日 10:00
地点: 物理所M楼,M830
报告人: Hui Hu

Centre for Quantum and Optical Science, Swinburne University of Technology

Abstract:
We propose that the long-sought Fulde-Ferrell superfluidity with nonzero momentum pairing can be realized in ultracold two-component Fermi gases of K-40 or Li-6 atoms, by optically tuning their magnetic Feshbach resonances via the creation of a closed-channel dark state with a Doppler-shifted Stark effect. In this scheme, two counter-propagating optical fields are applied to couple two molecular states in the closed channel to an excited molecular state, leading to a significant violation of Galilean invariance in the dark-state regime and hence to the possibility of Fulde-Ferrell superfluids. We develop a field theoretical formulation for both two-body and many-body problems and predict that the Fulde-Ferrell state has remarkable properties, such as anisotropic single-particle dispersion relation, suppressed superfluid density at zero temperature, anisotropic sound velocity and rotonic collective mode. The latter two features can be experimentally probed using Bragg spectroscopy, providing a smoking gun proof of Fulde-Ferrell superfluidity.

Reference:
1.     L. He et al., arXiv:1705.04830.

个人简历
胡辉是澳大利亚斯威本技术大学量子光学中心的副教授。1996 清华大学学士学位,2001清华大学博士学位;2001-2004先后在意大利国际理论物理中心和比萨高师从事博士后;2005澳大利亚昆士兰大学访问学者;2006-2008中国人民大学物理系责任教授;2009-2013获澳大利亚研究理事会特别人才计划女皇伊丽莎白二世基金 (ARC QEII Fellowship)。2014-2017获澳大利亚研究理事会特别人才计划未来研究员基金 (ARC Future Fellowship)

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