kagome metals

The fascinating physics of the kagome lattices

The kagome lattice has emerged as a prototypical playground for sought-after quantum phenomena of electronic matter. In fact, from the viewpoint of bandstructure and itinerant electrons, the kagome lattice offers a whole variety of appealing features. These range from Dirac cones and van Hove singularities to flat band, where the latter has been suggested as a natural host for ferromagnetism thanks to the quenching of kinetic energy and increase of the density of states, as well as for topological physics. Kagome Dirac cones, on the other hand, have become a paradigmatic tool to accomplish correlated Dirac fermions, possibly leading to hydrodynamic electron flows meeting the criteria for accessing the turbulent regime. Most recently, exotic electron instabilities have been reported at, or close to, van Hove filling, where the nesting properties of the kagome Fermi surface, combined with its sublattice interference, are preeminently suited for enhancing exotic two-particle effective interaction profiles.

Kagome systems represent an exciting direction of modern condensed matter physics, and here a list of my works in this field.

  1. Turbulent hydrodynamics in strongly correlated Kagome metals (2020)
  2. Kagome metal-organic frameworks as a platform for strongly correlated electrons (2020)
  3. Nature of Unconventional Pairing in the Kagome Superconductors AV3Sb5 (A = K;Rb;Cs) (2021)
  4. Van Hove tuning of AV3Sb5 kagome metals under pressure and strain (2022)
  5. Twofold van Hove singularity and origin of charge order in topological kagome superconductor CsV3Sb5 (2022)
  6. Electronic correlations and universal long-range scaling in kagome metals (2022)
A visualization of the zero-energy electronic states — also known as a Fermi surface — from the kagome material studied in Nature Physics 18, 301 (2022) (Credits: Riccardo Comin, MIT).

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Physicists discover “secret sauce” behind exotic properties of a new quantum material