Dark solitons in a superfluid Fermi gas
Dark solitons in a superfluid Fermi gas
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DOI：
10.1103/physreva.76.043610
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发表时间：
2007-10-01
影响因子：
2.9
通讯作者：
Stringari, Sandro
中科院分区：
文献类型：
--
作者：
Antezza, Mauro;Dalfovo, Franco;Stringari, Sandro
我们通过求解 Bogoliubov-de Gennes 方程并寻找阶数参数的实解和奇解，研究了超流费米气体中暗孤子沿 BCS-BEC 交叉的行为。我们表明，在散射长度较大的共振酉区域中，孤子的密度分布具有极小值，这与 BCS 区域中发生的情况不同。发现超流体间隙因孤子的存在而显着淬灭，这是由于出现位于有序参数的节点平面附近的安德烈夫费米子束缚态。
We investigate the behavior of dark solitons in a superfluid Fermi gas along the BCS-BEC crossover by solving the Bogoliubov-de Gennes equations and looking for real and odd solutions for the order parameter. We show that in the resonance unitary region, where the scattering length is large, the density profile of the soliton has a deep minimum, differently from what happens in the BCS regime. The superfluid gap is found to be significantly quenched by the presence of the soliton due to the occurrence of Andreev fermionic bound states localized near the nodal plane of the order parameter.