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Related Experiment Video

Updated: Feb 8, 2026

Synthesis of Non-uniformly Pr-doped SrTiO3 Ceramics and Their Thermoelectric Properties
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Disorder-Induced Mottness in a Doped Mott Insulator.

Hyungryul Yang1, Gyeongbo Kim2, Byeongin Lee1

  • 1Department of Physics, Yonsei University, Seoul 03722, Republic of Korea.

Nano Letters
|February 7, 2026
PubMed
Summary

Intrinsic disorder, not just electronic phase separation, explains the Mott insulating state in doped materials. Defects act as charge sinks, creating localized Mott regions and influencing electronic structure.

Keywords:
Doped Mott insulatorMott depletioncharge density waves (CDW)scanning tunneling microscopy (STM)

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Solid-State Chemistry

Background:

  • The persistence of the Mott insulating state away from integer filling is a long-standing problem.
  • Existing theoretical models often attribute this to electronic phase separation, but predictions differ from experimental observations.
  • Understanding the factors governing Mott insulator behavior is crucial for developing novel electronic materials.

Purpose of the Study:

  • To investigate the role of intrinsic disorder in the persistence of the Mott insulating state in doped materials.
  • To reconcile discrepancies between theoretical predictions and experimental results regarding critical doping levels.
  • To elucidate the mechanisms by which defects influence the electronic structure of Mott insulators.

Main Methods:

  • Scanning tunneling microscopy (STM) and spectroscopy (STS) were employed.
  • Measurements were performed on Fe-intercalated 1T-TaS2 (an electron-doped Mott insulator) and the 1T-TaS2 layer within 4Hb-TaS2 (a hole-doped material).
  • The electronic properties in the vicinity of point defects and domain boundaries were analyzed.

Main Results:

  • Mott insulating regions were observed to nucleate at point defects and charge density wave domain boundaries in electron-doped 1T-TaS2.
  • These defects function as local charge sinks, leading to sharp chemical potential differences and narrow Mott depletion plateaus.
  • In contrast, similar impurities in the hole-doped 1T-TaS2 layer of 4Hb-TaS2 did not induce incompressible regions.
  • This highlights a doping-dependent effect of disorder on the electronic structure.

Conclusions:

  • Intrinsic disorder, rather than solely electronic phase separation, is a critical factor in maintaining the Mott insulating state away from integer filling.
  • Local defects play a significant role in shaping the inhomogeneous electronic structure of doped Mott insulators by creating localized Mott regions.
  • The contrasting behavior between electron- and hole-doped systems underscores the importance of disorder in compensating doping effects.