Sublattice Interference promotes Pair Density Wave order in Kagome Metals

Autor:	Wu, Yi-Ming, Thomale, Ronny, Raghu, S.
Rok vydání:	2022
Předmět:	Condensed Matter - Strongly Correlated Electrons Condensed Matter - Materials Science Condensed Matter - Superconductivity
Druh dokumentu:	Working Paper
Popis:	Motivated by the observation of a pair density wave (PDW) in the kagome metal CsV${}_3$Sb${}_5$, we consider the fate of electrons near a p-type van Hove singularity (vHS) in the presence of local repulsive interactions. We study the effect of such interactions on Fermi surface "patches" at the vHS. We show how a feature unique to the Kagome lattice known as sublattice interference crucially affects the form of the interactions among the patches. The renormalization group (RG) flow of such interactions results in a regime where the nearest neighbor interaction $V$ exceed the onsite repulsion $U$. We identify this condition as being favorable for the formation of charge-density-wave (CDW) and PDW orders. In the weak coupling limit, we find a complex CDW order as the leading instability, which breaks time reversal symmetry. Beyond RG, we perform a Hartree-Fock study to a $V$-only model and find the pair-density-wave order indeed sets in at some intermediate coupling. Comment: main text: 6 pages and 3 figures. Supplementary material: 8 pages and 2 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2211.01388 Zobrazit plný text záznamu View this record from Arxiv