arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2103.13753cond-mat.supr-con
收藏

第二类van Hove奇点的p+ ip波配对对称性

p+ip-wave pairing symmetry at type-II van Hove singularities

Yinxiang Li, Xiaotong Yang

摘要:

基于双轨道蜂窝晶格模型中的无规相近似计算方法,研究了Ni基过渡金属三硫族化合物电子掺杂后的对对称性.我们发现当电子掺杂接近II型vHs时,手征偶宇称d+ id波(Eg)态被奇宇称p+ ip波(Eu)态抑制。态密度(DOS)中的II型vHs峰能够加强铁磁涨落,这是三重态配对的原因。反铁磁涨落与铁磁涨落的竞争导致了从单重态到三重态的配对相变。镍基过渡金属三硫属化合物为电子态密度下的非常规超导体提供了一个很有前途的平台。

英文摘要:

Based on the random phase approximation calculation in two-orbital honeycomb lattice model, we investigate the pairing symmetry of Ni-based transition-metal trichalcogenides by electron doping access to type-II van Hove singularities (vHs). We find that chiral even-parity d+id-wave (Eg) state is suppressed by odd-parity p+ip-wave (Eu) state when electron doping approaches the type-II vHs. The type-II vHs peak in density of states (DOS) enables to strengthen the ferromagnetic fluctuation, which is responsible for triplet pairing. The competition between antiferromagnetic and ferromagnetic fluctuation results in pairing phase transition from singlet to triplet pairing. The Ni-based transition-metal trichalcogenides provide a promising platform to unconventional superconductor emerging from electronic DOS.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑