论文标题
二维BCS-BEC跨界的Josephson效应具有超流体费米子
Josephson effect with superfluid fermions in the two-dimensional BCS-BEC crossover
论文作者
论文摘要
我们通过使用有效的隧穿能量明确取决于凝聚力分数和系统的化学潜力，研究了二维BCS-BEC交叉中费米子超流体的宏观量子隧穿。我们将平均场有效的隧道能量与超越均值的一个发现进行比较，即平均场隧穿能量在交叉的BEC状态下是不可靠的。然后，我们解决了人口不平衡的约瑟夫森方程以及在线性状态和非线性方面计算隧道振荡频率的相对相。我们的结果表明，由于有效的隧道能量在交叉中的特殊行为，约瑟夫森频率在BCS-BEC跨界的中间状态中更大。
We investigate the macroscopic quantum tunneling of fermionic superfluids in the two-dimensional BCS-BEC crossover by using an effective tunneling energy which explicitly depends on the condensate fraction and the chemical potential of the system. We compare the mean-field effective tunneling energy with the beyond-mean-field one finding that the mean-field tunneling energy is not reliable in the BEC regime of the crossover. Then we solve the Josephson equations of the population imbalance and the relative phase calculating the frequency of tunneling oscillation both in the linear regime and in the nonlinear one. Our results show that the Josephson frequency is larger in the intermediate regime of the BCS-BEC crossover due to the peculiar behavior of the effective tunneling energy in the crossover.
