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Pseudogap and Weak Multifractality in 2D Disordered Mott Charge-Density-Wave Insulator.

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|August 14, 2020
PubMed
Summary

We studied Se-substituted 1T-TaS2 and found a pseudogap replacing the Mott gap, suggesting a correlated metallic state. This offers new insights into superconductivity in 2D materials.

Keywords:
Mott insulatorcharge density wavedisordermultifractalitypseudogaptransition metal dichalcogenide

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Superconductivity

Background:

  • 1T-TaS2 exhibits a Mott-charge-density-wave (Mott-CDW) state, a unique electronic phase.
  • Superconductivity emerges in this material, but its origin remains debated.
  • Selenium (Se) substitution is explored to tune the electronic properties.

Purpose of the Study:

  • Investigate the electronic states of Se-substituted 1T-TaS2.
  • Understand the relationship between the pseudogap, Mott gap, and superconductivity.
  • Clarify the role of disorder in the emerging correlated metallic state.

Main Methods:

  • Scanning tunneling microscopy/spectroscopy (STM/STS) was employed.
  • Spatially resolved STS measurements were performed.
  • Statistical analysis of local density of states (LDOS) was conducted.

Main Results:

  • A pseudogap was observed, replacing the Mott gap while CDW gaps remained.
  • The pseudogap showed a global presence, independent of local Se concentration variations.
  • Enhanced correlation length of LDOS at the Fermi energy and weak multifractal behavior of wave functions were detected.

Conclusions:

  • The findings suggest a correlated metallic state induced by disorder in Se-substituted 1T-TaS2.
  • This provides new insights into the mechanism of emerging superconductivity in 2D materials.
  • The study highlights the complex interplay between CDW order, disorder, and superconductivity.