Shot noise and universal Fano factor as a characterization of strongly correlated metals

Wang, Yiming; Setty, Chandan; Sur, Shouvik; Chen, Liyang; Paschen, Silke; Natelson, Douglas; Si, Qimiao

doi:10.1103/PhysRevResearch.6.L042045

Title: Shot noise and universal Fano factor as a characterization of strongly correlated metals

Journal Article · 20 November 2024 · Physical Review Research

DOI: https://doi.org/10.1103/PhysRevResearch.6.L042045 · OSTI ID:2478289

; Setty, Chandan;

; Chen, Liyang;

; Natelson, Douglas;

Shot noise measures out-of-equilibrium current fluctuations and is a powerful tool to probe the nature of current-carrying excitations in quantum systems. Recent shot-noise measurements in the heavy-fermion strange metal ${YbRh}_{2} {Si}_{2}$ exhibit a strong suppression of the Fano factor ( $F$ )—the ratio of the current noise to the average current in the dc limit. This system is representative of metals in which electron correlations are extremely strong. Here we carry out the first theoretical study on the shot noise of diffusive metals in the regime of strong correlations. A Boltzmann-Langevin equation formulation is constructed in a quasiparticle description in the presence of strong correlations. We find that $F = \sqrt{3} / 4$ in such a correlation regime. Thus, we establish the aforementioned Fano factor as universal to Fermi liquids, and we show that the Fano factor suppression observed in experiments on ${YbRh}_{2} {Si}_{2}$ necessitates a loss of the quasiparticles. Our work opens the door to systematic theoretical studies of shot noise as a means of characterizing strongly correlated metallic phases and materials. Published by the American Physical Society 2024

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Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: FG02-06ER46337

OSTI ID:: 2478289

Journal Information:: Physical Review Research, Journal Name: Physical Review Research Journal Issue: 4 Vol. 6; ISSN 2643-1564; ISSN PPRHAI

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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