Excitation of the dissipationless Higgs mode in a fermionic condensate
Excitation of the dissipationless Higgs mode in a fermionic condensate
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费米子凝聚体中无耗散希格斯模式的激发
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
L. Levitov
中科院分区：
文献类型：
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作者：
R. Barankov;L. Levitov
类似于Higgs玻色子的费米子超流体，当其频率被推入BCS能隙内时，其振幅模在强耦合区变得无阻尼态。我们认为，由于对相互作用的能量色散和非局域性，在冷气体中是这样的，并建议使用Feshbach共振区来参数激发该模。给出的BCS配对动力学结果表明，即使是弱的色散也会抑制退相，并导致持续的振荡。从我们对BCS动力学的模拟中提取的振荡频率与多体理论的预测一致。
The amplitude mode of a fermionic superfluid, analogous to the Higgs Boson, becomes undamped in the strong coupling regime when its frequency is pushed inside the BCS energy gap. We argue that this is the case in cold gases due to the energy dispersion and nonlocality of the pairing interaction, and propose to use the Feshbach resonance regime for parametric excitation of this mode. The results presented for the BCS pairing dynamics indicate that even weak dispersion suppresses dephasing and gives rise to persistent oscillations. The frequency of oscillations extracted from our simulation of the BCS dynamics agrees with the prediction of the many-body theory.