论文标题
节点$ \ MATHBF {D} $ - 单波段和多型超导体中的波订单参数
Phase-sensitive determination of nodal $\mathbf{d}$-wave order parameter in single-band and multiband superconductors
论文作者
论文摘要
确定候选非常规超导体中超导顺序参数的确切配对对称性仍然是一个重要的挑战。最近，开发了一种基于相位敏感的准粒子干扰测量的新方法，以识别各向同性多播种系统中的间隙标志变化。在这里，我们将这种方法扩展到单频和多型节点$ D $ - 波超导案例，分别针对丘比特，可能是无限层镍甲酸盐超导体的相关案例。结合了分析和数值计算，我们表明，由于出生和中间散落的限制中的非磁性杂质，对状态的隧道密度的反对称校正显示了符号变化和标志性扩展散射波形的特征，以及动力分类的量化。此外，使用一种对Wannier轨道的逼真的方法，我们对$ \ text {bi} _2 _2 \ text {sr} _2 _2 \ text {cacu} _2 _2 \ text _2 \ text {o} _ {8+δ} $进行比较的实验数据的扫描扫描扫描显微镜数据数据。
Determining the exact pairing symmetry of the superconducting order parameter in candidate unconventional superconductors remains an important challenge. Recently a new method, based on phase sensitive quasiparticle interference measurements, was developed to identify gap sign changes in isotropic multiband systems. Here we extend this approach to the single-band and multiband nodal $d$-wave superconducting cases relevant, respectively, for the cuprates and likely for the infinite-layer nickelate superconductors. Combining analytical and numerical calculations, we show that the antisymmetrized correction to the tunneling density of states due to nonmagnetic impurities in the Born and intermediate-scattering limits shows characteristic features for sign-changing and sign-preserving scattering wavevectors, as well as for the momentum-integrated quantity. Furthermore, using a realistic approach accounting for the Wannier orbitals, we model scanning tunneling microscopy data of $\text{Bi}_2\text{Sr}_2\text{CaCu}_2\text{O}_{8+δ}$, which should allow the comparison of our theory with experimental data.
