Shot noise and universal Fano factor as a characterization of strongly correlated metals
Year: 2024
Type: article
Abstract: 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 = 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
Source: Physical Review Research
Authors: Yiming Wang, Chandan Setty, Shouvik Sur, Liyang Chen, Silke Paschen, Douglas Natelson, Qimiao Si
Language: English
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,625
Funders: National Science Foundation, U.S. Department of Energy, Welch Foundation, Aspen Center for Physics, Iowa State University, Austrian Science Fund, Horizon 2020 Framework Programme, European Research Council, Office of Naval Research, Division of Materials Research, Basic Energy Sciences, Air Force Office of Scientific Research, Ames Laboratory
Awards: G2134294606, G2209322555, G222768804, G2595738051, G2660310231, G2812005673, ELECTRONIC AND MAGNETIC PROPERTIES OF INDIVIDUAL FE304 NANOPARTICLES, G5229897703, Physics of Non-Fermi Liquid Metals, G5648016710, G6098521345, G638484911, G6628794799, G6671366621, Programs on Critical Problems in Physics, Astrophysics and Biophysics at the Aspen Center for Physics, G8080279443, G8162313811, G8435854849, G8474147658, Driving Spin Orbit Coupling to the Extreme (exSOC), G8786933421, G8876996369
OpenAlex ID: W4404587304