Theoretical modeling demonstrates enhanced nonlinear transport responses in strange metals, suggesting a new diagnostic framework to probe quantum material dynamics.
We show that nonlinear transport responses in strange metals are strong, larger by a factor of EF/T than in Fermi liquids. Within the two-dimensional Yukawa-Sachdev-Ye-Kitaev model of a Fermi surface with a spatially random coupling to a critical scalar, the third order conductivity is found to diverge as 1/T at low T, indicating the existence of a voltage-temperature scaling regime in the conductance. Its frequency and orientation dependence contains information on relaxation times of heat and electron distribution deformations, providing a new set of tools to characterize strange metals.
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Kryhin et al. (2025) studied this question.
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