Shot Noise in Correlated Electron Systems

Shot noise, an intrinsic representation of fluctuations in electric current, serves as a significant probe into the realm of strong correlations within quantum materials [1]. Traditionally utilized in discerning the elementary charge borne by quasiparticles, shot noise provides critical insights into the microscopic properties of quantum systems. In this study [2], we focuses on the analysis of quantum shot noise within a correlated diffusive metal, achieved by formulating a Boltzmann transport equation optimized for correlated regimes. We examine the impact of electron correlations on the Fano factor — the proportion of current noise to DC current. We discuss the relevance of our results to recent shot noise experiments in the strange-metal regime of a quantum critical heavy fermion metal YbRh2Si2 [3].

References:

[1] Ya. M. Blanter, M. Buttiker, Phys. Rep. 336, 1 (2000).

[2] Y. Wang et al., arXiv:2211.11735.

[3] L. Chen et al, arXiv:2206.00673 (Science, in press).