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arXiv 0704.1292cond-mat.supr-concond-mat.mes-hall
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费米凝聚体中无耗散Higgs模的激发

Excitation of the dissipationless Higgs mode in a fermionic condensate

R. A. Barankov, L. S. Levitov

摘要:

与希格斯玻色子类似,费米子超流体的振幅模式在强耦合区中当其频率被推入BCS能隙内时变得无阻尼。我们认为,这是在冷气体中的情况下,由于对相互作用的能量色散和非局域性,并建议使用费什巴赫共振制度的参数激发这种模式。BCS配对动力学的结果表明,即使是弱色散抑制退相,并引起持续振荡。从我们的BCS动力学模拟中提取的振荡频率与多体理论的预测一致。

英文摘要:

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.

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