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

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dc.citation.articleNumberL042045en_US
dc.citation.issueNumber4en_US
dc.citation.journalTitlePhysical Review Researchen_US
dc.citation.volumeNumber6en_US
dc.contributor.authorWang, Yimingen_US
dc.contributor.authorSetty, Chandanen_US
dc.contributor.authorSur, Shouviken_US
dc.contributor.authorChen, Liyangen_US
dc.contributor.authorPaschen, Silkeen_US
dc.contributor.authorNatelson, Douglasen_US
dc.contributor.authorSi, Qimiaoen_US
dc.date.accessioned2025-01-09T20:16:58Zen_US
dc.date.available2025-01-09T20:16:58Zen_US
dc.date.issued2024en_US
dc.description.abstractShot 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 YbRh2⁢Si2 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 YbRh2⁢Si2 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.en_US
dc.identifier.citationWang, Y., Setty, C., Sur, S., Chen, L., Paschen, S., Natelson, D., & Si, Q. (2024). Shot noise and universal Fano factor as a characterization of strongly correlated metals. Physical Review Research, 6(4), L042045. https://doi.org/10.1103/PhysRevResearch.6.L042045en_US
dc.identifier.digitalPhysRevResearch-6-L042045en_US
dc.identifier.doihttps://doi.org/10.1103/PhysRevResearch.6.L042045en_US
dc.identifier.urihttps://hdl.handle.net/1911/118114en_US
dc.language.isoengen_US
dc.publisherAmerican Physical Societyen_US
dc.rightsExcept where otherwise noted, this work is licensed under a Creative Commons Attribution (CC BY) license. Permission to reuse, publish, or reproduce the work beyond the terms of the license or beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.en_US
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/en_US
dc.titleShot noise and universal Fano factor as a characterization of strongly correlated metalsen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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