Multidome superconductivity in charge density wave kagome metals

TL;DR

This paper proposes that superconductivity in kagome metals with charge density waves arises from a weak-coupling instability of a reconstructed Fermi surface, explaining the multidome pressure dependence and energy scale separation.

Contribution

It introduces a parent-child framework linking CDW and superconductivity, highlighting the role of Fermi surface reconstruction and Van Hove singularities in kagome metals.

Findings

Superconducting Tc shows a multidome structure under pressure.

Van Hove singularities correlate with Tc peaks.

Reconstructed Fermi surface explains energy scale separation.

Abstract

Motivated by recent experiments on the kagome metals $A\text{V}_3\text{Sb}_5$ with $A=\text{K}$, $\text{Rb}$, and $\text{Cs}$, which show a charge density wave (CDW) at $\sim100$ K and the superconductivity at $\sim1$ K, we explore the onset of the superconductivity, taking the perspective that it descends from a parent CDW. We argue that viewing the superconductivity as a weak-coupling instability of a reconstructed (by the CDW) Fermi surface naturally explains the experimentally observed 'multidome' nonmonotonic dependence on pressure, with the 'peaks' in the superconducting critical temperature being associated with the Van Hove singularities of the reconstructed Fermi surface. This 'parent-child relationship' also naturally explains the large separation of energy scales between the superconductivity and the CDW. We discuss different possible pairing mechanisms and speculate that the CDW or reconstructed Pomeranchuk fluctuations may mediate the pairing interaction.