Possible Pairing Symmetry in the FeSe-Based Superconductors Determined by Quasiparticle Interference
Possible Pairing Symmetry in the FeSe-Based Superconductors Determined by Quasiparticle Interference
复制标题
由准粒子干涉确定的 FeSe 基超导体中可能的配对对称性
DOI：
10.1103/physrevlett.121.267005
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发表时间：
2018
影响因子：
8.6
通讯作者：
Wang Qiang-Hua
中科院分区：
文献类型：
--
作者：
Gao Yi;Wang Yuting;Zhou Tao;Huang Huaixiang;Wang Qiang-Hua
我们研究了 FeSe 基超导体中的动量积分准粒子干涉（QPI）。该方法最近在理论上提出，并已应用于通过实验确定这些材料的配对对称性。我们的研究结果表明，如果考虑初始能带及其上的超导（SC）配对，那么即使费米面上的 SC 序参数没有改变符号，实验测量的束缚态和动量积分 QPI 也可以很好地拟合。因此，我们对实验数据提供了另一种解释，要求更仔细地识别对配对机制很重要的配对对称性。
We study the momentum-integrated quasiparticle interference (QPI) in the FeSe-based superconductors. This method was recently proposed theoretically and has been applied to determine the pairing symmetry in these materials experimentally. Our findings suggest that, if the incipient bands and the superconducting (SC) pairing on them are taken into consideration, then the experimentally measured bound states and momentum-integrated QPI can be well fitted, even if the SC order parameter does not change sign on the Fermi surfaces. Therefore, we offer an alternative explanation to the experimental data, calling for more careful identification of the pairing symmetry that is important for the pairing mechanism.