Singular charge fluctuations at a magnetic quantum critical point

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Abstract
Spin-charge entanglement: Many physical properties follow characteristic scaling laws near quantum critical points, which are associated with phase transitions at absolute zero temperature. The material YbRh 2 Si 2 has an antiferromagnetic quantum critical point, where spin-related properties are expected to follow such a scaling. Unexpectedly, Prochaska et al. found that charge fluctuations follow a critical scaling as well. The researchers fabricated high-quality thin films of YbRh 2 Si 2 and used transmission spectroscopy to measure the optical conductivity of the film and infer the scaling. Their findings point to a highly entangled state of charge and spin, which may also be responsible for the strangemetal phase in this material. Science , this issue p. 285

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