论文标题
费米表面嵌套单独可以驱动单层钒中的电荷密度波变化吗？
Can Fermi surface nesting alone drive the charge-density-wave transition in monolayer vanadium diselenide?
论文作者
论文摘要
我们证明，通过在过渡金属二进制二进制元素元素1T-VSE $ _2 $的单层中的纯电子机制可以通过纯电子机理形成电荷密度波。通过对扩展的哈伯德模型的重新归一化组处理，我们研究了超导和密度波波动的竞争，因为费米表面的部分被调整为完美的嵌套。当海森贝格交换相互作用与库仑排斥相当时，我们发现电荷密度波顺序的区域，以及$ d $ - 波的超导性，用于纯粹的排斥相互作用。我们讨论了晶格振动在增强有效的海森堡交换中的可能作用。
We demonstrate that charge-density-wave formation is possible via a purely electronic mechanism in monolayers of the transition metal dichalcogenide 1T-VSe$_2$. Via a renormalization group treatment of an extended Hubbard model we examine the competition of superconducting and density-wave fluctuations as sections of the Fermi surface are tuned to perfect nesting. We find regions of charge-density-wave order when the Heisenberg exchange interaction is comparable to the Coulomb repulsion, and $d$-wave superconductivity for purely repulsive interactions. We discuss the possible role of lattice vibrations in enhancing the effective Heisenberg exchange.
