Electronic properties of correlated kagom\'e metals AV$_3$Sb$_5$(A = K, Rb, Cs): A perspective

TL;DR

This paper reviews recent experimental and theoretical advances in understanding the electronic properties of kagomé metals AV₃Sb₅, highlighting their topological features, unconventional superconductivity, and charge density wave phenomena.

Contribution

It provides a comprehensive overview of recent findings and theories on the correlation-driven electronic phenomena in AV₃Sb₅ kagomé metals, emphasizing their potential as platforms for topological and strongly correlated physics.

Findings

Observation of Dirac bands and anomalous Hall effect

Detection of bulk superconductivity with T_c ~ 0.9-2.5 K

Evidence of charge density wave instabilities

Abstract

Following the discovery of a new family of kagom\'e prototypical materials with structure AV$_3$Sb$_5$ (A = K, Rb, Cs), there has been heightened interest in studying the correlation-driven electronic phenomena in these kagom\'e lattice systems. The study of these materials has gone beyond magneto-transport measurements to reveal exciting features such as Dirac bands, anomalous Hall effect, bulk superconductivity with $T_c$ $\sim$ 0.9 K-2.5 K, and the observation of charge density wave instabilities, suggesting an intertwining of topological physics and new quantum orders. Moreover, very recent works on numerous types of experiments have appeared further examining the unconventional superconductivity and the exotic electronic states found within these kagom\'e materials. Theories on the strong interactions that play a role in these systems have been proposed to shed light on the nature of these topological charge density waves. In this brief review, we summarize these recent experimental findings and theoretical proposals, and envision the materials as new platforms to study the interplay between topological physics and strongly-correlated electronic systems.