Wang Fa, Zhai Hui, Ran Ying, Vishwanath Ashvin, Lee Dung-Hai
Department of Physics, University of California at Berkeley, Berkeley, California 94720, USA.
Phys Rev Lett. 2009 Jan 30;102(4):047005. doi: 10.1103/PhysRevLett.102.047005. Epub 2009 Jan 29.
We apply the fermion functional renormalization-group method to determine the pairing symmetry and pairing mechanism of the FeAs-Based materials. Within a five band model with pure repulsive interactions, we find an electronic-driven superconducting pairing instability. For the doping and interaction parameters we have examined, extended s wave, whose order parameter takes on opposite sign on the electron and hole pockets, is always the most favorable pairing symmetry. The pairing mechanism is the inter-Fermi-surface Josephson scattering generated by the antiferromagnetic correlation.
我们应用费米子泛函重整化群方法来确定铁基砷化物材料的配对对称性和配对机制。在具有纯排斥相互作用的五能带模型中，我们发现了一种电子驱动的超导配对不稳定性。对于我们所研究的掺杂和相互作用参数，扩展s波（其序参量在电子和空穴口袋上取相反符号）总是最有利的配对对称性。配对机制是由反铁磁关联产生的费米面间约瑟夫森散射。
