论文标题
电子电子和电子 - 音波介导的配对之间的跨界
Crossover between electron-electron and electron-phonon mediated pairing on the Kagome lattice
论文作者
论文摘要
我们研究了荷斯坦扩展的哈伯德模型中的电子电子和电子 - 音波介导的配对，并在范霍夫填充物附近的kagome晶格上研究，并研究了它们对电子配对状态的综合作用。我们发现它们的组合可以在跨界区域促进异国情调的配对，那里的填充物接近Van Hove的奇异性。特别是，在$ p $ -Type van Hove上填充$ e_ {1u} $（$ p $ -Wave）和$ b_ {2u} $（$ f_ {y^3-3yx^2} $ - wave）配对变得领先配对被提升。此外，我们表明，由于费米表面的sublattice质地，电子 - 光子相互作用获得了显着的动量依赖性，这可以促进非$ s $波配对。我们对这些配对倾向进行了详细的分析，并讨论了对基于钒的Kagome超导体AV $ _3 $ SB $ _5 $的影响。
We study electron-electron and electron-phonon mediated pairing in the Holstein extended Hubbard model on the Kagome lattice near the van Hove fillings, and investigate their combined effects on electron pairing states. We find that their combination can promote exotic pairings in a crossover region, where the filling is close to a van Hove singularity. In particular, at the $p$-type van Hove filling the $E_{1u}$ ($p$-wave) and $B_{2u}$ ($f_{y^3-3yx^2}$-wave) pairings become leading, and at the $m$-type van Hove filling the $E_{1u}$ and $A_{2g}$ ($i$-wave) pairings get promoted. Moreover, we show that the electron-phonon interaction acquires a significant momentum dependence, due to the sublattice texture of the Fermi surfaces, which can promote non $s$-wave pairing. We present a detailed analysis of these pairing propensities and discuss implications for the vanadium-based kagome superconductors AV$_3$Sb$_5$.
