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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Surface Science

Background:

  • Ytterbium hexaboride (YbB_{6}) is theoretically a topological insulator.
  • Experimental observations show conducting surface states, but their origin is unclear.
  • Lack of natural cleavage and surface polarity hinder YbB_{6} research.

Purpose of the Study:

  • To investigate the surface structure and electronic properties of cleaved YbB_{6}.
  • To clarify the nature of conducting surface states in YbB_{6}.
  • To assess the potential of YbB_{6} for spintronic applications.

Main Methods:

  • Scanning tunneling microscopy (STM) was used to image cleaved YbB_{6} surfaces.
  • Spectroscopic measurements were performed to analyze electronic properties.
  • Atomic structures of different surface terminations were characterized.

Main Results:

  • Cleaved YbB_{6} surfaces exhibit multiple coexisting terminations with distinct atomic structures.
  • Band bending between terminations creates both conducting and fully gapped (insulating) domains.
  • Conducting domains show spectral peaks consistent with Van Hove singularities from Rashba spin-split quantum well states.

Conclusions:

  • The presence of insulating domains excludes YbB_{6} as a strong topological insulator.
  • Spin-polarized conducting domains indicate potential applications in spintronics.
  • Understanding surface terminations is crucial for YbB_{6} research.