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Updated: Sep 13, 2025
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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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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.
Physical Review Letters
|July 31, 2025
Summary
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.
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.
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