Speaker
Description
Strange metal behavior – best known as a linear-in-temperature electrical resistivity out of which unconventional superconductivity nucleates – is ubiquitous in many classes of strongly correlated electron systems [1], and has recently also been observed in new flat band platforms. A unified understanding is in high demand. The heavy fermion compound YbRh$_2$Si$_2$ is a particularly versatile model system for studying this physics. I will present its salient features, including the dynamical scaling of the optical conductivity [2], its superconductivity at ultralow temperatures [3], and its strongly suppressed shot noise [4]. I will also discuss evidence for (some of) these features in other material’s classes, the topic of Planckian scattering [5], and how insights gained from all these experimental results may boost the theoretical understanding.
[1] S. Paschen and Q. Si, Nat. Rev. Phys. 3, 9 (2021); S. Paschen and Q. Si, Europhys. News 52/4, 30 (2021).
[2] L. Prochaska et al., Science 367, 285 (2020).
[3] D. H. Nguyen et al., Nat. Commun. 12, 4341 (2021).
[4] L. Chen et al., arXiv:2206.00673 (2022); Y. Wang et al., arXiv:2211.11735 (2022).
[5] M. Taupin and S. Paschen, Crystals 12, 251 (2022); X. Li et al., Front. Electron. Mater. 2, 934691 (2023).
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