论文标题
SR $ _2 $ ruo $ _4 $超导体的轨间配对状态的表面状态
Surface State of Inter-orbital Pairing State in Sr$_2$RuO$_4$ Superconductor
论文作者
论文摘要
我们研究了最近提议的$ e_g $对称性跨度旋转旋转 - 旋转s波超导（SC）状态的（001）的表面状态。我们确认，这对潜力将转变为手性$ d $波对的潜力，并且在乐队基础上以低能范围的基础上转变为伪Zeman Field。由于手性$ d $波对电位，在（001）表面的每个频段的手性D波对势的动量范围内，表面状态在动量范围内出现在零能量附近。然而，伪齐曼场给出了表面状态的频带分裂，并且其分裂能量比SC能量差距小得多。当分辨率低于拆分能量时，由于表面接近零能量，SC状态（001）表面（001）表面（001）表面的局部密度在零能量处具有明显的峰结构。这种峰结构在扰动下是可靠的，例如轨道rashba耦合或表面上的$ e_u $ sc对潜力。
We study the (001) surface state of a recently proposed $E_g$ symmetry inter-orbital-odd spin-triplet s-wave superconducting (SC) state in Sr$_2$RuO$_4$ (SRO). We confirm that this pair potential is transformed into a chiral $d$-wave pair potential and a pseudo-Zeeman field in the band basis for a low-energy range. Due to the chiral $d$-wave pair potential, the surface states appear near zero energy in the momentum range enclosed by the nodal lines of the chiral d-wave pair potential for each band at the (001) surface. Nevertheless, the pseudo-Zeeman field gives band splitting of the surface states, and its splitting energy is much smaller than the SC energy gap. The local density of states (LDOS) at the (001) surface of the SC state has a pronounced peak structure at zero energy due to the surface states near zero energy when the order of the resolution is lower than the splitting energy. This peak structure is robust under perturbations, such as an orbital Rashba coupling or an $E_u$ SC pair potential at the surface.
