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Strong Nonlinear Response of Strange Metals.

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Nonlinear transport in strange metals is significantly stronger than in Fermi liquids. This study reveals a novel voltage-temperature scaling in conductance, offering new ways to characterize these exotic materials.

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Area of Science:

  • Condensed matter physics
  • Quantum materials research

Background:

  • Strange metals exhibit unusual electronic properties not explained by traditional Fermi liquid theory.
  • Understanding their transport behavior is crucial for developing new electronic devices.

Purpose of the Study:

  • To quantify nonlinear transport responses in strange metals.
  • To investigate the relationship between conductance and temperature.
  • To identify new methods for characterizing strange metals.

Main Methods:

  • Utilized the two-dimensional Yukawa-Sachdev-Ye-Kitaev model.
  • Analyzed a Fermi surface with spatially random coupling to a critical scalar.
  • Calculated the third-order conductivity.

Main Results:

  • Nonlinear transport responses are stronger by a factor of E_{F}/T compared to Fermi liquids.
  • Third-order conductivity diverges as 1/T at low temperatures.
  • Identified a voltage-temperature scaling regime in conductance.

Conclusions:

  • Strange metals exhibit enhanced nonlinear transport properties.
  • The observed 1/T divergence and scaling regime offer new insights into their behavior.
  • Frequency and orientation dependence of conductivity provide tools to probe relaxation times.