Higgs Mode in a Trapped Superfluid Fermi Gas
Higgs Mode in a Trapped Superfluid Fermi Gas
复制标题
俘获超流体费米气体中的希格斯模式
DOI：
10.1007/s10909-017-1766-2
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发表时间：
2017
影响因子：
2
通讯作者：
Tetsuro Nikuni
中科院分区：
文献类型：
--
作者：
Jun Tokimoto;Shunji Tsuchiya;Tetsuro Nikuni
在具有连续对称性自发破缺的量子多体系统中，希格斯模以序参量的集体振幅振荡形式出现。最近，在超导体和光学晶格中的玻色气体中观察到希格斯模式。然而，它还没有在费米气体中被观察到。在本文中，我们利用随时间变化的Bogoliubov-de Gennes方程研究了波散射长度突变引起的捕获费米气体中超流体序参量的希格斯振幅振荡。特别地，我们研究了不同初始散射长度值的希格斯模式，并讨论了希格斯模式的频率和阻尼如何在统一区周围变化。
In quantum many-body systems with spontaneous breaking of a continuous symmetry, Higgs modes emerge as collective amplitude oscillations of order parameters. Recently, Higgs modes have been observed in superconductors and in Bose gases in optical lattices. However, it has yet to be observed in Fermi gases. In the present paper, we use the time-dependent Bogoliubov–de Gennes equations to investigate Higgs amplitude oscillations of the superfluid order parameter in a trapped Fermi gas induced by a sudden changes of the-wave scattering length. In particular, we investigate the Higgs mode with different values of the initial scattering length and discuss how the frequency and damping of the Higgs mode changes around the unitarity regime.