Abstract
Following the discovery of a new family of kagomé prototypical materials with structure AV3Sb5 (A=K, Rb, and Cs), there has been a heightened interest in studying the correlation-driven electronic phenomena in these kagomé 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 Tc∼0.9−2.5K, 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 kagomé 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.
Highlights
Materials with kagomé crystal structures have attracted significant interest due to the emergence of flat bands with electronic band structures that can host Dirac cones and van Hove singularities
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
Formation of superconducting ground states in layered kagomé compounds is rare; the discovery by groups at the University of California, Santa Barbara and at the Colorado School of Mines of a new family of kagomé metals, AV3Sb5 (A 1⁄4 K, Cs, and Rb) has led to a plethora of substantial findings.[1]. Among these include the manifestation of superconductivity at 0.9–2.5 K and an intriguing charge-density-wave transition around 78–103 K. These kagomé metals have uncovered a fascinating platform for new insights into the rich physics that lies at the interplay between strong electronic correlations, nontrivial band topology, unconventional superconductivity, and emergent quantum orders
Summary
Materials with kagomé crystal structures have attracted significant interest due to the emergence of flat bands with electronic band structures that can host Dirac cones and van Hove singularities. Formation of superconducting ground states in layered kagomé compounds is rare; the discovery by groups at the University of California, Santa Barbara and at the Colorado School of Mines of a new family of kagomé metals, AV3Sb5 (A 1⁄4 K, Cs, and Rb) has led to a plethora of substantial findings.[1] Among these include the manifestation of superconductivity at 0.9–2.5 K and an intriguing charge-density-wave transition around 78–103 K. These kagomé metals have uncovered a fascinating platform for new insights into the rich physics that lies at the interplay between strong electronic correlations, nontrivial band topology, unconventional superconductivity, and emergent quantum orders. We conclude with a perspective on the implications that derive from these experimental and theoretical studies on our understanding of strongly correlated topological kagomé superconductors as well as outstanding questions and potential applications using this family of materials
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