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Strong Nonlinear Response of Strange Metals
Serhii Kryhin1, Subir Sachdev1, Pavel A Volkov2
1Harvard University, Department of Physics, Cambridge, Massachusetts 02138, USA.
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.
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