Comment on "Shot noise in a strange metal"

Abstract

The recent paper (Science 382, 907 (2023)) is devoted to measurements of shot noise to probe excitations in nanowires of the heavy fermion (HF) metal $\rm YbRh_2Si_2$. The authors observed that shot noise is strongly suppressed, and claim that the suppression cannot be attributed to either electron-phonon or electron-electron interactions in a Fermi liquid. Their observation suggests that the current is not carried by well-defined quasiparticles in the $\rm YbRh_2Si_2$, and calls for similar research into other strange metals. In this comment, we show that it is unlikely that the affected carriers in bulk $\rm YbRh_2Si_2$ would have undergone any fragmentation.