Sublattice interference promotes pair density wave order in kagome metals

Abstract

Pair density wave superconductivity arises when the two paired fermions have finite center-of-mass momentum. It is usually not a weak coupling instability and requires stringent conditions, such as the pairing interaction remaining attractive at finite momentum, and the interaction strength has to be strong enough. Here, the authors find that the kagome lattice model, when doped to a particular Van Hove filling with both onsite and nearest neighbor repulsion, can serve as an ideal platform for realizing this novel superconducting state.

Topics & Concepts