Strong non-linear response of strange metals

Abstract

We show that nonlinear transport responses in strange metals are strong, larger by a factor of $E_F/T$ 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.

5 pages, 2 figures, 6 Supplemental Information sections

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Cited by in corpus (3)

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• Anomalous terahertz nonlinearity in disordered s-wave superconductor close to the superconductor-insulator transition
• Two-dimensional THz spectroscopy in electronic systems: a many-body diagrammatic approach