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Intertwined Solitons and Impurities in a Quasi-One-Dimensional Charge-Density-Wave System: In/Si(111).

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Summary

Topological solitons in indium atomic wires are clarified: "short" defects are not solitons. "Long" defects are genuine solitons, with chirality dependent on indium adatoms, impacting potential logic applications.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Surface Science

Background:

  • Quasi-one-dimensional (quasi-1D) charge-density-wave (CDW) systems, such as indium atomic wires on Si(111), exhibit complex phenomena.
  • Topological solitons, their size, chirality, and potential for logic applications have been subjects of recent investigation.

Purpose of the Study:

  • To resolve the controversy regarding the existence of highly localized solitons in In/Si(111) CDW systems.
  • To identify the nature of "short" and "long" phase-flip defects observed in these systems.
  • To elucidate the conditions for the existence and chirality of topological solitons and their interaction with adatoms.

Main Methods:

  • Utilizing scanning tunneling microscopy (STM) for atomic-scale surface imaging.
  • Employing first-principles calculations to model the electronic and structural properties of the system.
  • Analyzing defect structures and their relationship to the underlying charge-density-wave order.

Main Results:

  • "Short" phase-flip defects were identified as indium adatoms, possessing a non-solitonic nature.
  • "Long" phase-flip and phase-slip defects were confirmed as genuine topological solitons.
  • Achiral solitons (phase-slip) exist on the pristine 8×2 CDW surface, while chiral solitons (phase-flip) require trapping by In adatoms to form closed-loop domain walls, preserving the 8×2 ordering.

Conclusions:

  • The existence of highly localized, few-atom-sized solitons is refuted; observed "short" defects are adatoms.
  • Chirality of solitons is intrinsically linked to the presence and trapping by In adatoms.
  • The proposed logic applications based on soliton chirality require careful consideration of In-adatom defect interactions, presenting both limitations and opportunities for defect-controlled logic.