COMP Centre of Excellence and Department of Applied Physics, Aalto University, FI-00076 Aalto, Finland.
Department of Physics and Photon Science, School of Physics and Chemistry, Gwangju Institute of Science and Technology, Gwangju 500-712, Korea.
Phys Rev Lett. 2014 Oct 31;113(18):185301. doi: 10.1103/PhysRevLett.113.185301. Epub 2014 Oct 30.
We study fermionic superfluidity in strongly anisotropic optical lattices with attractive interactions utilizing the cluster dynamical mean-field theory method, and focusing in particular on the role of nonlocal quantum fluctuations. We show that nonlocal quantum fluctuations impact the BCS superfluid transition dramatically. Moreover, we show that exotic superfluid states with a delicate order parameter structure, such as the Fulde-Ferrell-Larkin-Ovchinnikov phase driven by spin population imbalance, can emerge even in the presence of such strong fluctuations.
我们利用团簇动态平均场理论方法研究了具有吸引力相互作用的强各向异性光晶格中的费米子超流性，并特别关注非局域量子涨落的作用。我们表明，非局域量子涨落对 BCS 超流转变有显著影响。此外，我们还表明，即使存在如此强烈的涨落，也能出现具有精细序参量结构的奇特超流态，例如由自旋密度不平衡驱动的富勒-费雷尔-拉金-奥夫钦尼科夫相。
