Suppression of shot noise at the strange metal of a Kondo destruction quantum critical point

Strange metallic behavior is a hallmark of many correlated quantum materials. Heavy-fermion systems provide a prototypical platform. Here, strange metallicity develops near a Kondo-destruction quantum critical point, where quasiparticles cease to exist. A key open question concerns the fate of charge carriers in the strange metal state. Motivated by recent shot-noise measurements in heavy-fermion strange metals [1], which discovered a shot noise strongly reduced from the universal value of strongly correlated Fermi liquids [2], we investigate current fluctuations by advancing a minimal Bose–Fermi Kondo lattice model [3]. Our analysis reveals a strong suppression of shot noise at the Kondo-destruction quantum critical point, offering insight into the observed experimental behavior. These results shed new light on nonequilibrium signatures of quantum criticality and provide broader implications for charge transport in strange metals.