Do strange metals carry current in electron-like quasiparticles?
In plain words
Shot noise, the current fluctuation caused by charge arriving in discrete packets, reveals whether current is carried by electron-like particles; in one strange metal the noise was far smaller than expected.
Precise statement
Measure the Fano factor $F = S_I/(2 e I)$ in mesoscopic wires of strange metals in the $T$-linear regime and determine whether suppression of $F$ below the Fermi-liquid values ($1/3$ for elastic diffusive transport, $\sqrt{3}/4$ for hot electrons) reflects the absence of quasiparticles or electron-phonon energy relaxation. An answer is a cross-material data set with independently measured electron-phonon length plus a theory of shot noise without quasiparticles that matches it.
What would settle it
Length- and temperature-dependent shot-noise measurements in at least two strange-metal families with control wires of a conventional metal in the same geometry.
Status in the literature
Unverified note: it names recent work and was partly written without a live literature search; it awaits a check by an editor.
Strongly suppressed shot noise was reported in $\mathrm{YbRh_2Si_2}$ nanowires in 2023; whether electron-phonon relaxation can explain it is debated.
Parent problems
- Special case of Microscopic origin of T-linear resistivity in strange metals · open · from revision 1 The parent was revised since revision 1: it now states another question.
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