Journal
NEW JOURNAL OF PHYSICS
Volume 22, Issue 9, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1367-2630/abab3d
Keywords
ultracold Fermi atomic gas; dynamical structure factors; Higgs mode; dimensional effect
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Funding
- National Natural Science Foundation of China [11547034, 11804177]
- Shandong Provincial Natural Science Foundation, China [ZR2018BA032]
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Based on random phase approximation, we numerically calculate dynamical structure factors of a balanced two-dimensional (2D) Fermi superfluid, and discuss their energy, momentum and interaction strength dependence in the 2D BEC-BCS crossover. At a small transferred momentum, a stable Higgs mode is observed in the unitary 2D Fermi superfluid gas where the particle-hole symmetry is not satisfied. Stronger interaction strength will make the visibility of the dispersion of Higgs mode harder to be observed. We also discuss the dimension effect and find that the signal of the Higgs mode in two dimension is more obvious than that in 3D case. At a large transferred momentum regime, stronger interaction strength will induce the weight of the molecules excitation increasing, while in verse the atomic one decreasing, which shows the pairing information of Fermi superfluid. The theoretical results qualitatively agree with the corresponding quantum Monte Carlo data.
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