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Pseudogap in cuprates in the loop-current ordered state.

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Summary
This summary is machine-generated.

Disorder in cuprates creates loop-current domains, causing fermion scattering and a pseudo-gap. This gap magnitude correlates with loop order, explaining experimental observations in under-doped cuprates.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Materials

Background:

  • Under-doped cuprates exhibit a pseudo-gap, a key feature influencing their electronic properties.
  • Spatial variations in the pseudo-gap magnitude, observed via scanning tunneling microscopy (STM), suggest a link to material disorder.
  • Loop-current order, characterized by the anapole vector Ω, has been identified in similar temperature and doping regimes.

Purpose of the Study:

  • To investigate the relationship between loop-current order, material disorder, and the formation of the pseudo-gap in under-doped cuprates.
  • To explain the spatial variation and angular dependence of the pseudo-gap using a theoretical model.
  • To reconcile theoretical predictions with experimental findings from STM, ARPES, and polarized neutron scattering.

Main Methods:

  • Theoretical modeling of loop-current order in the presence of disorder.
  • Analysis of domain formation and its effect on fermion scattering.
  • Comparison of theoretical predictions with experimental data, including STM, ARPES, and polarized neutron scattering measurements.

Main Results:

  • Disorder induces finite correlation length for loop-current order, leading to domain formation with varying Ω.
  • Domain boundaries cause forward scattering of fermions, creating a pseudo-gap with angular dependence and no density of states bump.
  • The pseudo-gap magnitude systematically increases with the square of the average loop order parameter.

Conclusions:

  • The interplay between disorder and loop-current order provides a consistent explanation for the observed pseudo-gap in under-doped cuprates.
  • The model successfully explains the spatial variation, angular dependence, and magnitude of the pseudo-gap, aligning with experimental data.
  • Predictions are made for future experiments, including expected low-frequency excitations and implications for local probe measurements.