论文标题
在范霍夫填充物附近的Kagome晶格上的超导涡流状态中的电子结构和自旋晶格松弛
Electronic structure and spin-lattice relaxation in superconducting vortex states on the kagome lattice near van Hove filling
论文作者
论文摘要
从货车填充物附近的Kagome晶格上的紧密结合模型开始，使用Bogoliubov-De Gennes方程进行了自谐的超导（SC）特性，并考虑到不相等的第三型纽伯伯（TN）键。在Van Hove填充物附近，发现最有利的SC配对是从属于同一sublattice站点的电子中得出的，包括现场$ S $ - 波和旋转式Singlet/singlet/triplet TN配对。对于TN SC配对，不相等的TN键将导致多种具有不同轨道角动量（OAM）的SC分量。虽然状态（dos）的密度和温度（$ t $）的依赖性（$ t^{ - 1} _ {1} $）在三种情况下在SC状态下显示出明显的线形状，而$ t $依赖性的峰值结构是$ t^{-1} _ {1} _ {1} $的$ tany tase $ at tase $ at y tase $ a {1} _ {1} $ at tase cy at tase cy t y n of tase cy tase cy t y n ynect $ a fan n tase cy cy t y n ynect $ a fan n tase cy cy t y n yneft $ a {奇异性，即使SC差距有节点。对于两种情况，还讨论了磁性涡流对$ t^{ - 1} _ {1} $ $ t $依赖性的影响以及两种情况下的结果的影响。
Starting from a tight-binding model on the kagome lattice near the van Hove filling, the superconducting (SC) properties are investigated self-consistently using the Bogoliubov-de Gennes equation with the consideration of the inequivalent third-neighbor (TN) bonds. Near the van Hove filling, the most favorable SC pairings are found to derive from the electrons belonging to the same sublattice sites, including the on-site $s$-wave and the spin-singlet/triplet TN pairings. The inequivalent TN bonds will result in multiple SC components with different orbital angular momentums (OAM) for the TN SC pairings. While the density of states (DOS) and the temperature ($T$) dependence of the spin-lattice relaxation rate ($T^{-1}_{1}$) exhibit distinct line shapes in the SC state for the three cases, a peak structure in the $T$ dependence of $T^{-1}_{1}$ can be found for both cases just below $T_{c}$ as a result of the van Hove singularity, even though the SC gap has nodes. The effects of magnetic vortices on the low energy excitations and on the $T$ dependence of $T^{-1}_{1}$ with the implications of the results are also discussed for both cases.
